350 tbi weak spark. Got timing roughly set around 0.
350 tbi weak spark. - Answered by a verified Chevy Mechanic .
350 tbi weak spark Joined Dec 7, 2010 Posts 87 Reaction score 0 Location Kalamazoo MI. need help CRANK NO START. Thread starter 95Escahoe; Start date Dec 16, 2012; ive always run delcos. tbi no injector pulse 1989 k1500. 7 Vortec Coil? Here are some of the causes for no spark from your 5. 9 Discussion starter. I don't think you have an ignition module or computer (brain) at fault as this usually causes a no spark issue. Kleavitt18; Jan 3, 2025; Engine Performance + Maintenance; 2. What's new. Replies 15 Views 589. To Check the ignition system, including spark plugs, wires, distributor cap, and rotor, to diagnose poor engine 95 350 TBI 1500 When it’s cold it starts OK. Seems a little weak, but it's only cranking. gap. He uncovered it to launch last weekend and no start. Here are the spark/fuel correction Check to see if your truck has a crankshaft position sensor, its usually located behind the harmonic balancer or right near there, if the sensor went bad or if the wiring got messed up there will be no signal to the ecm When your engine is cold, everything works fine, but once it heats up, the ignition system components like spark plugs, ignition coils, and spark plug wires can’t handle the heat and start to fail. Besides the either "Wide open throttle" or zero injector pulse, I also have no spark at coil, so no spark to distributor or plugs. To avoid running into similar issues in the future, it’s essential to take some preventative measures. Post: Modifying TBI Spark Table (Attn: 83G20Van) (Topic#103019) Farmer Mike Member Posts: 25 Loc: Colorado Springs, Co. But first, benefits! Benefits of Using Spark Plugs for 350 TBI. 7 350 tbi wont start it has 93k miles, its getting fuel into the injectors, my injectors are working, fuel pump is working i hear it going on and its new as well, fuel pump relay, fuel injectors, fuel filter are all new, now to the ignition side the distributor is new, coil is new, ignition module, fuses, pick up I have a 1988 c2500 with the 350 tbi, it wad running super rough and wouldn't hold idle so I checked the wires and found out they were going to the wrong plugs, I fix that and it won't start and only backfires while attempting to start, I've replaced the ignition coil, map sensor, distributor cap and the wires/plugs are fairly new. If your spark plugs have a narrow gap, it will then lead to a weak spark. Summary. 56 gears - G80 MSD boxes like a 6al. Customer: 1995 chevy K1500 350 cid. Got in the truck, started it, drove to the end of my block, and it just died. new to tunerpro tbi 350 Post by davveek » Thu Oct 06, 2011 1:06 am i have a dumb question but was wondering if anyone could give me some tips on learning the tunerpro program. Fuses checked out good, pulled #1 wire placed a spare plug in it, grounded it to the exh. From the ignition system providing spark to the fuel injectors 91 Chevy 350 TBI - Spark Advance. 10 posts · Joined 2004 Add to quote; Only show this user #8 Re: 88 350 TBI timing/ignition problem 12-02-04 03:26 PM - Post# 566009 In response to loudpedal Where is the timing advance controlled? Ignition module, electronic spark control? I disconnected the knock sensor and nothing changed. Guys running a high performance HEI Distributor in my 72 Nova SS 350 Engine. An HEI distributor that has a worn pick-up coil or corroded magnetic poles will produce a weak spark, with insufficient voltage to ignite the combustion gases. I hope this makes sense to someone, and you can provide me some assistance. some times you can get a slight difference messing with spark plug gap to about . NO fuel pressure until oil pressure builds, 94 4. We drug it to the house and no spark at all, plenty of fuel. I start the truck up and it starts and runs great idles like its supposed to. Without checking for power to the distributor with a test light or multimeter, this is a simple way to check for power to the ignition system. My 79 K10/20 has a swapped in TBI 350 from a 1988 K5. I don't know much about engines but my thought is that water and spark wouldn't mix. 3. Thread starter inittab; Start date May 13, 2011; Help Support Yamaha Raptor 350 & Warrior Forum: This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others. Tags 350 chevy iac idle air control valve tbi. 3 and it still wasn't dead!) The 5. I thought I had a fuel delivery problem. Thread starter Christian Sullivan; I'd be looking at "tune-up" issues--failed cap 'n' rotor, weak coil, defective plug wires, fouled or worn plugs, etc. UPDATE!!!! Put a test light on the tach terminal at the distributor. Both injectors are working and I tried the spark tester on a second cylinder on the other side of the block and I had spark there as well. More Power in Every Purchase - Join the Summit Rewards Program Today! Recommended spark plugs are ACDelco CR43TS with . boat: 1994 Prostar 190 tbi. Also to note. Additionally, other engine components, such as the spark plugs or fuel 350 TBI Timing Off Symptoms indicates critical problem in your engines. It ran for about 30 seconds and died. L. 3 now a 5. Maybe even distributor and other stuff. -Have 12v on the pink wire going to distributor. mr heavy-chevy I just bought a 91 350 TBI with 267K km and i was thinking about doing the spark plugs, Wires etc. Turned off engine, tried to start, no start. 7) will not start. Viewed 46 times I'm thinking if it was the ICM you'd not be getting any spark at all, while a weak spark (it should be bluish-white if healthy) might be pointing to a coil. v8woody66; Oct 29, 2024; Engine Performance + Maintenance; Replies 5 Views 369. This can also cause fouling, rough idling, and acceleration problems. Re: weak spark 97 - 5. Cutting out, loss of spark, which usually is worse the higher the temperature of the module is, Spark Plugs for TBI. Simply unplug it there and forget about it, no need to have any wires connected together. The most common cause is usually the fuel pump itself to where it has to be This problem can be a distributor (pick up coil,weak spark),incorrect timing,vacuum leak. I left the plug out, pulled the kill lanyard, and turned the engine over. Maybe weak spark (got an HEI spark tester)? Once you get the engine running, try spraying some water on your coil, see if it stumbles. If your 91 chevy tbi 350 no spark or inj pulse. performance. 08-10-15 10:45 AM - Post# 2567771 I have a 94 gmc Sierra with a 350 tbi. 7 has a claimed 96K miles on it and is a roller cam 5. Check the wiring and plug to the ESC Module. 7 from a Caprice. 7/MG5 Originally a 4. Mechanic's Assistant: What is the model/year of your Chevy? Customer: 87 Silverado TBI 350 Mechanic's Assistant: Are you fixing your Silverado yourself? What have you tried so far? Customer: I have checked for voltage at the coil and at distributor and have 12 volts. ran good up till about a week ago. The bike ran great last week, very hard to start though. I have a 1992 Chevy k2500 with a 350 TBI in it and I have recently started having no pulse/spark/no start issues that I am trying to figure out. TBI truck timing tables are restricted to a max of 29* total timing in most OEM tunes, with it advanced to 8* for base, you are giving it 37* in some cases, but unless the ESC is failing, I would venture to blame fuel, or it may even With the engine idling, the spark looks very weak, like the spark you get on a weedwacker or chainsaw. 4 posts · Joined 2008 Add to quote; Only show this user #1 · Nov 10, 2008. stumbles. Don't know if this is a common issue or not, but would like to know about repair or overhaul if any wheelers have suggestions. Fuel filter My 83 350 will not start but have checked all the plugs for spark and checks good. 7L/350 Chevy small block Gen I Spark Plugs. Save Share Reply Quote Like. The source going bad will give you weak spark, no spark is usually just bad pickup long as all the rest checks out. It is ALMOST never the problem as Greetings, I have owned TBI - powered rigs (91 Suburban, 94 G20 van) for a decade and while I have loved the dependability I have only rally partaken in basic troubleshooting and maintenance and I seek to know more and to better understand the system and, modify/tune it myself. Replace worn or damaged spark plugs. Reg: 08-03-03. So if the charging system is weak at idle like when you add a high output alt. It's everything. Plugged the Chevy 350 TBI Timing issues, Please Help! esc, electronic spark control(tan wire with black stripe located on the firewall). Yeah, Check the screws holding the module down in the dist. It is a flat tappet cam but we ran zinc in break in and still do so worn down lobes is unlikely. Cranks but won't start. That is the part number that Summit uses. It receives signals from the distributor and the engine control module (ECM) to determine when to fire each spark plug. Started replaced the fuel pump on my 87 350 tbi thinking it was toast but got stuck couple of weeks later to look further only to find , Diagnose - no start with added fuel means no spark (TBI uses distributor pulse signal to ECM to run fuel too). Another thing you could do to see if you have a weak spark is to pull the spark plug out and lay it against the head and kick it over. The temp sensor for the ECM is in the intake manifold near the thermostat housing. I am just about out of ideas. I checked it out yesterday and when Ignition control module failure modes on TBI engine. Jump to Latest FYI it's a 90 model 350. . The 215k mile 350 in my 94 G20 lost oil pressure and seized up. Could it be a bad ignition module? What is anyone's opinion of Auto Zone's checks on ignition module? (accurate Author Topic: 1987 tbi 350 cranks wont run (Read 28241 times) Irish_Alley. Replace the ICM. if there is spark there then i might be able to condemn the cap and rotor. 7 TBI no spark. I am having a problem where I am not getting spark. There is all new fuel system from the tank, all the way up to the throttle body. 7 TBI conversion 1978 Mustang II King Cobra Road Racer - Holley 650, MSD 6AL, 5 91 Chevy C1500 ext cab, TBI 350, NV4500, 2in suspension lift. ) Weak Spark. This is a long post, so please bear with me! Details 1992 C1500 5. Dec 19, 2012 #6 Serial # OM311933, Year 2002 Boat was running fine. Hope this helps. I did so by getting the numbers from the current plugs. The engine will crank, the injectors spray fuel. Instead, your engine makes a weak sound that you're not proud of. I have changed plugs, wires, cap, rotor, fuel filter (twice, clean on second change), rebuilt the tbi, and gutted the catalytic converter and had new exhaust put on it. I have a 350 that has developed a miss/dead ctylinder. Need to find out if there is any fuel getting up to the TBI at all. Schurkey. Send Private Topic View Profile. inittab New Member. Here is the results of my testing. Thread starter Alex Meador; Start date Dec 16, 2017; Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. Replace old O2 sensors unless you can PROVE that they're working My 1990 K1500 350 TBI recently had a NO START condition with NO spark and NO fuel spray at TBI. Please don’t use these. First, it could be due to an ignition timing issue. I have changed the fuel pump, fuel filter, fuel pressure regulator, injectors, ignition module, coil and spark plugs. Ok folks, I am begging for help. However, having trouble starting your Chevy 350 engine despite having both spark and fuel can be extremely frustrating. It 08-30-09 06:32 AM - Post# 1763040 What are symptoms of an ignition module that's failing, on a 92 TBI 350? When my engine is hot and I'm accelerating between 1500 and 2500 rpm, I get noticeable drops on the rpm gauge and when the TCC is locked in OD, I can feel it missing, the whole truck kinda bucks. Measure engine compression using a compression tester. Hes only got on it hard a few times. This can be seen by a sporadic miss when the engine pulls under a heavy load or the vehicle has to climb a hill or steep mountain pass. Usually indicated by erratic higher rpm operation, and a "hunting 1991 suburban 350 TBI no start. Has a 650 holley 4 barrel that is freshly rebuilt. Checked spark with spark plug tester tool and no light. It seems like the motor doesnt have enough vaccuum when i time it properly. Those you can check pretty easily. A weak spark is an indication that something’s not quite right. 3 TBI has fuel and spark, cranks, no start. If you click them and make a purchase, we may earn a small commission. As a result, it will not ignite your fuel or air mixture effectively. ) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a I wondered if anyone could help me with a question that I can not seem to get a answer to. Got timing roughly set around 0. Any deviation results in weak acceleration and reduced power. So I was driving it and at a stop light I have a 1990 350 tbi that runs great cold. P. Hello all, I am a new kid on the block. Coil was a culprit on one of my old tbi vehicles having hard time starting/running when cold . K. You will need to test these systems to find the failure. Spark wander is usually caused by a worn distributor or distributor gear, which will not act 'so' badly when driving under load. Not Yet Reviewed. Chevy expert. The motor was freshened up about 1500 miles ago. Crank, no spark condition. This pile has been sitting for almost a decade, until recently. There is NO fuel spray, but I do hear fuel pump run in the also it looks like I'm getting weak spark at idol that gets stronger as the rpm rises. Jump to Latest currently the engine has ac delco cr43ts spark plugs and they tend to foul easily due to some oil burning and the engine running rich i was thinking about switching to r45ts ac delcos hoping they would burn off the excess fuel and oil i dont think this will hurt anything but any input would be Hi, I have a 1990 Chevy K2500 5. I've checked continuity on just about all wires in the harness. Jan 6, 2025. The numbers or labels on the diagram correspond to the specific cylinder numbers on the engine, making it easier to match the wires to their appropriate positions. Sorry you spent money and time on the computer. It's a rebuilt 350 tbi and spark plug tester shows a orange spark which I read means is weak. Ensure the spark plugs aren’t fouled and the spark plug wires are connected properly. Latest: evilunclegrimace; 8 minutes ago; Engine Performance + Maintenance. 350 TBI ran fine, now surging start. They crank fine, and getting fuel - but no spark. There IS spark at each plug. The spark can be tough to see if it's a bright area. I verified that my ignition coil is providing plenty of spark to the distributor (I verified), but I am getting no spark at all to any of the plug wires. Jump to Latest Will run with fuel dumped in tbi so it has spark No power or ground at the injectors. Hooked timing light up to #1 wire see if there is spark and yes there is. Members online. Some water sprayed The Chevy 350 TBI engine is a popular choice among car enthusiasts and mechanics due to its reliability and performance. Customer. Throttle body injected 350, all bone stock. Will spark, but no injector pulse. runs very rich and wont idle on its own with stock tune. Would platinums be better or worse in this type of engine? Like i said, what are you guys running, what works best? [SIGPIC][/SIGPIC] 1990 Silverado Extended Cab 2/4 Drop, 20" Old NGK Spark plugs for 350? Jump to Latest 1994 Chevy Silverado 1500 2wd Ext Cab 350 cuin TBI in dark Chevy blue 200,000+ miles Monster 4L60E Transmission with 1650rpm Stall Original engine K&N 57 Series Round Intake True Dual MagnaFlow exhaust Long tube Headman Elite headers MSD 6L Ignition(currently unhooked) MSD Distributor(stock style) I have a tbi 350 and it will crank and will not idle and when you go down the road it backfires back through the. falls on its face when cold. Started up fine, ran a few minutes and died. Customer: On a 1995 350 I have reddish to orange spark from the coil to distributor cap, If you have corrosion around the pick up coil or if the rotor or cap is corroded or burned it can cause a weak spark like this here. Seems to me I'm not getting enough spark advance at times. That TBI 350 will run for a very long while if it is taken care of. and low coil saturation, leading to weak spark. Easy to do with a test light. The 350 TBI engine uses a 1-8-4-3-6-5-7-2 firing order. Checked both spark and injector spray and nothing from both. Ask Question Asked 3 years, 6 months ago. Joined Jun 28, 2014 About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright hello 1987 TBI with a manual transmission ***** low power. This order is key to how well and efficiently the engine works. KEEP TBI SIMPLE is my rule. Send Private Topic The timing specs for a Chevy 350 TBI are 0 degrees BTDC at idle with the electronic spark control unplugged and 10-16 degrees BTDC at idle with the electronic spark control connected. Fantastic info. Pump seems fine. Turn on the ignition. Some days it has the power it should have, others it feels like it's falling on its face pulling itself up hill. In summary, the spark plug is an essential component in your Customer: I have a 1990 350 tbi and it has fuel and spark but it just cranks and won’t start, I have replaced the ignition coil complete distributor Mechanic's Assistant: Have you checked the engine's fuel supply? And the spark plugs -- are they all working? Customer: spark plugs and map sensor were also replaced Mechanic's Assistant: Are you fixing your Spark yourself? What Plug question, 5. At this point I will look at vacuum + fuel pump, but I still feel like I am getting weak spark. 7, seems to be misfiring/shaking badly, new plugs, new rotor, new ICM, new coil, cruise control vacuum line plugged back in (fell off recently). I. 7L/350: Spark Plugs - Amazon. But when trying to adjust the timing it would stop. Once decent valve springs and decent cam are used the zinc issue becomes and issue. What spark plug gap would be best for all around Street Performance on this Engine with a 10-1 Compression, World Heads, What method did you use to determine a "very weak spark?" Do you have access to one of these? ST125 spark tester. Voltage at the spark plug is checked using Spark Tester tool Ok, seeing as your stator looks to spec out ok, it's time to turn to other things. A malfunctioning ICM can lead to a variety of frustrating symptoms that can affect your vehicle’s performance dramatically. I then figured it may be the spark plugs because those were the only other noticeable change I made to the engine. New sometimes when it is failing, it has weak spark untill underhood temps warm up. Is there a separate circuit for Forums. 7L 350 TBI 09-09-2010, 02:21 PM. Checked/cleaned/lubed 350 TBI starting issues. when put in gear, i have to feather the gas to keep it 1991 350 TBI no injector pulse. 4. Modified 3 years, 6 months ago. i want to test for spark at the main spark wire. A timing light shows the timing to be set correctly. . Thanks! The 350 TBI spark plug wire diagram typically consists of numbered lines or labels representing each spark plug wire, as well as the distributor cap terminals and spark plug locations. Tips for preventing 350 tbi runs great cold, dies when warm Issue. If you have a nice hot spark with a fairly audible "crisp" snap/pop in the tester, replace the coil wire and/or the dist cap. J. 60mm Reach, Tapered Seat, AM General, Buick, Chevy, Dodge, Ford, Olds, Plymouth, Pontiac, Each. 7-liter V8, was first introduced in the mid-1980s and has since become a staple in the automotive industry. Swapped distributor twice, once with a known good dist and once with a new Besides the either "Wide open throttle" or zero injector pulse, I also have no spark at coil, so no spark to distributor or plugs. T. I just. man, had friend crank engine, no spark, did the same for the coil, no spark. One of these things should point you in the direction of what is Post: 94 350 tbi no injector pulse (Topic#327457) Sierryalater Forum Newbie Posts: 2 Reg: 08-10-15. #nospark When you have no spa -----No spark in this configuration-----I have spark when I plug in the shunt plug (the one with the little white jumper wire for setting the timing -terminals R+E), the black wire (terminal B) has 12v. Filter by Availability Filter Results 1990 GMC C1500 Individual Parts. I have yet to see an MSD 6a or 6al box have any positive affect on TBI or any other fuel injection for that matter and I have seen it cause more than few issues. Diesel5. I What are symptoms of an ignition module that's failing, on a 92 TBI 350? When my engine is hot and I'm accelerating between 1500 and 2500 rpm, I get noticeable drops on the rpm gauge and when the TCC is locked in OD, I can feel it missing, the whole truck kinda bucks. During my testing sometimes it would spark. Power outages, faulty ignitions, block engine spark plugs, badly worn spark plugs, oil fouled spark plugs, and fuel consumption are all possible for drivers. The HEI has been inspected and has new cap, rotor , and wires. That is the full rundown on the truck. Expert. i bought a apu1 setup from moates but i need to learn the program To be clear to the OP. General Q & A - 350 mag mpi no spark - Need a little help here. '89 k1500 350 TBI Crank no start Has Fuel and Spark . The lean running condition can be caused by a weak fuel pump, restricted fuel filter, a vacuum leak in the engine, faulty fuel pump relay, or injector issues. Are you familiar with the procedure to Seafoam the engine? If not, search for it on this site. I replaced the distributor with a new rebuilt AC Delco from rock auto today. To diagnose poor engine performance, start by checking the ignition system, including spark plugs, wires Alright guys ive posted on this before I have a 1988 Chevrolet K2500 4X4, it is a 350 V-8 TBI, with a 5speed manual. Its my first GMT400 and i love it so far. It will drink a whole lot less fuel The Chevy 350 engine is a popular engine used in many cars and trucks due to its reliable and robust performance. 7 TBI No Spark. Knowing the gap of your spark plugs for your chevy 350 is very important. Tim; Senior Member; Posts: 13333; Family is not an important thing. Using a Autolite Plug 145. --I also have spark if I disconnect the terminal GBRE plug. com FREE DELIVERY possible on eligible purchases 43 ESC - electronic spark control ESC module not receiving knock sensor signal 44 Lean Exhaust Low oxygen sensor voltage 45 Rich Exhaust High oxygen sensor voltage 51 PROM (Memcal) Faulty computer chip 350 TBI. 7L/350 TBI (THROTTLE BODY INJECTION), 48,000 VOLT EFI DUAL CONNECTOR COIL and 8mm HI-PERFORMANCE SPIRAL CORE SPARK PLUG WIRES that are made in the USA! We also reviewed the best spark plugs for 350 tbi And then, there is a buying guide too. I pulled Code 32. stock? DELCO! Mar 25, 2013 #3 Jims86 Full Access Member. I was told I have an engine miss so I replaced the plugs. I could get the bike to backfire, but that was all. Sent from my SM-G965U using Tapatalk Why is there no spark from my 5. Hi, help required for a year old issue with my 2003 nag 350 mpi, i have an intermittent spark issue from the coil, this can be trying to start the engine, out at low rpms or even at 4000rpm, i have traced the problem i think to the ecm not allowing the spark I traced wiring today to find while 91 Chevy 350 TBI - Spark Advance. Here, we’ll discuss the 87 tbi 350 transplant, no spark, no voltage to fuel pump « on: September 27, 2016, 09:10:04 PM » My 76 k20 has been on the road for a couple weeks getting a shakedown following being the recipient of an 87 tbi 350 and wiring harness, conversion from th350/np203 to sm465/np205. 7 (I did the swap, have had the truck since 1998, 323K on the original 4. Overnight, however, it will present the problem. Does the light come on? If not, either there is no power to the distributor, or the ignition coil is defective. After warms up it either dies or will not restart after shut down. ) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you 1967 Landcruiser <350 Chevy> 1970 Camaro 1990 Geo Metro Convertible 2007 FJ Cruiser. My fuel injectors won't pulse. 1988 Chevrolet C3500 pickup; 5. What I have done: Verified voltage at coil and ICM at distributor, key ON and START, voltage good. If the spark is not strong as it used to be or if you are having to try multiple times to start the truck, you can be sure that the spark is weak. Understanding Ignition Control Module Symptoms When it comes to diagnosing issues with the 350 TBI (Throttle Body Injection) engine, one of the key components to consider is the ignition control module (ICM). None of the ads I have seen for it differentiates between engines, just say GM TBI. Sort by Oldest first Oldest first Newest first Most Unfortunately, the 350 TBI is also known for its tendency to backfire through the exhaust. what could be my problem? I have a 87 Chevy R1500 w/ 350 TBI. Replaced battery. WICruiser Discussion starter. Checked pick up coil resistance, checked out fine. I had been expecting a good fat spark, but was disappointed. 1987 TBI wont start, no spark, but has fuel. pulled plugs and found two with motor oil at base. Testing the #1 plug wire it makes a long spark and sparks everytime it should. The sender for your temp guage is in the drivers side cylinder head near the spark plugs. Tried 4 different computers and pretty much swapped every sensor on the engine. or the spark plugs would not be firing at all. D. Spend that money on the new distributor and good plug wires. 93 454 TBI - no start after head gasket replacement. General Q & A - 350 MAG MPI - Weak/Intermittent Spark - MCM 350 MAG MPI S/N 1A043677 This is my brother's Sea Ray bow rider he bought late last year. What are the symptoms of a faulty pickup coil (inside the distributor) or is this more likely just an ignition maintenance thing where I just need to replace cap and rotor. ToddAuto. It appears that I am not getting a signal to the coil. The service manual claims it is supposed to be 60-66 psi. I do not want to just start replacing electrical parts at random hoping for the fix. 30 yrs experience ase cetified tech shop owner. I thought the problem was in the carburetor, but after going through the carb I checked the bike for spark. I have a 350 mag mpi that has no spark/fire. Especially since you unplug the spark advance 350 TBI backfire. phrogs Registered Member. U. Reactions then could it be bad wiring that is I have an '87 Scottsdale Suburban 4x4 w/a 350 tbi it's running very sluggish and weak. the computer will richen the fuel My 1988 chevy 350 cci tbi is loosing power and stalls on excelration. He is saying that it has spark but it is weak after the intitial spark and then randomly has a good spark and will 'cough' a little, 91 Chevy 350 Weak spark and cluster issues. Verify proper initial timing (TBI) and electronic spark advance (TBI and Vortec). - Answered by a verified Chevy Mechanic When battery voltage is low, the ECM can compensate for the weak spark by: Increasing the amount of fuel delivered. Part Groups. This engine, also known as the 5. Background. Is there a test that reveal if the spark is too weak? Save Share Reply Quote Like. This means the spark plugs light up the fuel in the cylinders in this exact order, starting with the front left cylinder, which is 1990 GMC C1500 5. Hi all, I have a 280 Sundancer. spark-plug in cylinder #8 is oil fouling really bad. This thread is archived New comments cannot be posted and votes cannot be cast comments sorted by Best Top New HIGH PERFORMANCE DISTRIBUTOR FOR 1987-1995 CHEVY/GMC SUBURBAN & 1995 CHEVY TAHOE/GMC YUKON with 5. See less See more Valve seals are a common issue on the tbi 350s mine has 93k miles on it and has needed them to be done since the late Waited until after work, went back out, still no Vroom, just the rer - rer. 73gear ratio, extended cab long bed. The ECM won't pulse the injectors if it doesn't know the engine is turning over (which it does through the My 87 GMC (TBI 5. The fuel lines were replaced a couple years ago. The spark was weak (small and yellow). they have the 1. What method did you use to determine a "very weak spark?" Do you have access to one of these? ST125 spark tester. Definately gonna save this for referenceThanks! Oct 30, 2015 #6 G. 7 11-10-03 04:50 AM - Post# 333455 In response to builderpaul your coil is shot,i have seen this more than twenty times this year alone,these new systems with an external coil have a problem with coil going dead resulting in a faint or weak spark,it's not the module,if that was the cause you would have no spark at all. so if that's the case i should be able RECOMMENDED 350 TBI MODS. Now it seems as though the spark is very weak. I have a similar problem but on a 1996 Prostar 190 275 HP TBI 350. Thank you. 159 posts · Joined 2013 Add to quote; Only show this user #1 · Apr 13, 2017. 7 TBI. 265/70/17s. Increasing the idle speed. I am not sure if that is real or just what the ECM is Weak signal to module, results in random misfire. Replies 43 Views 3K. New posts New 87 chevy silverado tbi 350 crank but no start. Thread starter Kleavitt18; TBI top plates are very weak and they will bend through the thin areas before they seat if you pull them down with the screws. 1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4. I tried to start it back up with a jump pack and a then with a fully charged battery. By Kaz November 8, 2024 in Yamaha ATV Forum. 005 but i wouldnt overdue it. So far Replaced ICM. i am tuning a tbi 350 chevy it has high compression 454tb thumpr cam. unpredictable1; Aug 10, 2024; Engine Performance + Maintenance; 3 4 5. Hello all, I purchased a 91 chevy pickup with a 5. The MSD part number is MSD-8226. The Chevy 350 TBI engine is a popular choice for hot rods and other high-performance vehicles due to its power and durability. Mechanic's Assistant chat. By chatting and providing personal info, you understand If, however, there is no spark or a weak spark, test the ignition coil as well as the camshaft and crankshaft position sensors. My motor serial # 0l092658 Transom # 0l294350 Drive serial # 0l422426 My boat is a 99 vip vidicator Boat started up fine a month ago but now it won't fire up. Checked entire fuel sytem added new in-line filter, seperator/filter and low pressure pump. I just hadn’t messed with one in over 15 years. TBI is not a race car injection system. Turned off engine, tried to start, no. 7 350 automatic single cab long bed drove it for a little bit before parking the vehicle and it hasn't started since, I've replaced coil, plug wires, distributor, icm, ecm, ignition switch, wire to the coil from the icm consistent orange spark from coil and very slow spark from plug in the wire to the distributor truck also has I have a 1988 c2500 with the 350 tbi, it wad running super rough and wouldn't hold idle so I checked the wires and found out they were going to the wrong plugs, I fix that and it won't start and only backfires while attempting to start, I've replaced the ignition coil, map sensor, distributor cap and the wires/plugs are fairly new. It surges when. Galane Full Access Member. The 350 Throttle Body Injection (TBI) engine, known for its reliability and performance, powers many classic and modern vehicles. Fuel lines. An excessively narrow gap might result in a weak spark that is not strong enough to finish combustion in the vehicle; a gap that is too large can end up with erroneous spark plugs, producing faulty hot ignition at 350 TBI: Scanner Shows Knocking on Acceleration. (DD) 2012 Mitsu Outlander Sport (DD#2) Email Report pocketpistolpete Forum Newbie Posts: 15 Loc: Indiana Reg: 10-22-13. 1. To really get the 350 TBI firing order, you need to know it’s the order in which the cylinders in a Chevy 350 engine fire or ignite. Bright 350 warrior weak spark. 7 has a claimed 96K miles on it and Has spark and gas. I don't think the pickup coil is replaced as an individual unit. TBI No spark, no fuel. from the ignition coil the voltage and current should stay the same from coil to plug because the distributor does what its named for, dirtribute. Jul 18, 2016 #6 M. I've got a piece of shit 1990 GMC C1500 with a 350 TBI. What are the best and most reliable new spark plug out there for a 1987 350 TBI engine ? Mar 25, 2013 #2 dhamp Full Access Member. Answered by ToddAuto in 11 mins 10 months ago. Cap and Rotor. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc. small block marine engines with Delco EST ignition system. 10 gears 200K miles Back in the day before HEI an old shadetree trick was to open up the sparkplug gaps to get a hotter spark when the coil got a little weak. 3 TBI won't start~ good compression, air, spark, fuel. Does it have weak spark? You should be testing to see 11-30-13 08:19 PM - Post# 2403865 okay so all of a sudden my 94 c1500 5. I have fuel out of injectors,power to the coil. [i checked for spark in a dark shop, so not to have the lighting drown out the spark]. Kinda thinking the pickup coil is integrated with the distributor mainshaft. I was completely wrong on the spark. Well, you can simply fix this by replacing your spark plug. I have a 1988 Chevy 350 TBI K1500 truck and need to know could a defective ECM cause it to have no spark. In order to maximize power output and efficiency, optimal timing is essential. 1967 Free Shipping - BluePrint Engines GM 350 C. 95 c1500 4. 1995 K 2500 5. Part Number: DNP-5035. Customers will re-use their existing intake manifold, ECU, and fuel system A detailed wiring diagram is essential for understanding and troubleshooting the 350 TBI (Throttle Body Injection) system. D-1-0-N-Aug 19, 2024; Engine Performance + Maintenance; Replies 4 Views 657. Started and ran up river 5 mins, sputtered, I put in Neutral, Idle bumped up to 1500 RPM, stalled. New posts Search forums. - Checked ECU for damage, burnt components, bad solder joints, none visible. 5. unpredictable1. I have a 91 Silverado with a 350 that appears to have no spark advance. Couple this with an occasional rough idle that goes away above 1000rpms. I did this swap as I'm putting a set of TBI heads on my 75 350 that I'm building. Now my question: What spark plugs are used in the TBI heads? 82 corvette, TBI 5. New MAP, EGR, O2, TPS, ESC, distributor and coil. WOW i have never seen something like this in my life! i'm ready to ull my hair out! The bike is hard too start. First what kind of cable/Plugs i should use? Does high performance and iridium plugs help for power? Is it worth changing the distributor if the engine runs well? As far as I can tell, it should work for all GM TBI engines. Next is spark plugs, reason the stock camshaft lasted as well as it did was the very low duration and lift of the cam as well as the very weak valve springs. All fuses fine, Jeep Chassis and TBI harness fuses/Relays. 94EC_Silver. Results 1 - 22 of 22 Spark Plug, U-Groove, T20PR-U, 14mm Thread, 11. In this article, we'll provide you with a detailed and informative troubleshooting guide to help you diagnose and fix Chevy 350 Won't Start has 1995 chevy K1500 350. 7 Vortec Coil: Faulty spark plug; Battery issues; Corroded wires; Distributor cap; However, if you’re facing the issue of Experiencing 350 TBI timing off symptoms? Learn how to diagnose, adjust, and troubleshoot this issue to ensure optimal engine performance with our expert guide. Question . in. Share Sometimes I get a very weak, intermittent glow on my spark tester, but not enough to fire the plug. - Swapped in known good ECU from my 1988 TBI Suburban, no change. He test drove it, had it winterized and then had a gps installed last month. This article provides a comprehensive guide to the wiring diagram of the 350 TBI, including its components and connections, to help enthusiasts and mechanics with their diagnostic and repair tasks. any and all help troubleshooting this will definitely help with my mental stability, 1995 GMC K1500 - 350 TBI - K & N Intake - 6 in Fabtech lift - 18x10 in wrapped with 35'z - 4. Even with starting fluid it only putts a couple times. I retested my fuel pressure at the Shrader valve underhood and got no more than 49psi. What I have done: Verified voltage at coil and ICM at Check to see if the coil is getting the signal to Fire. My Burb has been working great for the past year (89 TBI 350) as a yellow spark is a weak spark. How To Identify A Weak Spark – Signs To Look For 1999 Yamaha Big Bear 350 4x4 no spark Facebook; Twitter; YouTube; Pinterest; 1999 Yamaha Big Bear 350 4x4 no spark. If you find the fuel system to be in good order, I'd check timing, you may have jumped a link on your timing chain. The "white" connector in the pic is the park brake one. Both engines have the same problem. User Info. Here are the parts that I Hi guys, I am a newbie on the forum and in need of assistance. He doesnt run it hard at all. Thread starter studigggs; Start date Apr 29, 2019; Tags knock mt2500 tbi timing Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. Disconnected spark advance and started up. See if you actually have a weak spark at the coil. I have a 1990 chevy I can look at for reference and i can pretty much unplug everything and still have pulse using a noid light SPARK PLUG WIRE SET RED DELCO EST OEM# IND-75-6002 OEM Indmar spark plug wire set for V8 GM 350 & 383 cu. There is no fuel fuel coming off the injectors at crank but I do have spark (I can see spark with my spark plug tester and the RPM needle does move up slightly when I crank). W. I have the truck listed above 350 TBI in it. Sep 2, 2024. i need to REALLY rev it and ride the clutch Forums. Vortec 310, Hammerhead, Assault, TBI 350; Not for LT1 - LTR or 2006 & up HVS flat cap; Indmar no longer sells the blue (Malibu) wires; OEM Indmar spark plug wire set for V8 Best plugs for 350 TBI. I Chevy 350 TBI: Idle Air Control Valve. Bone stock 88 TBI, set you timing to zero (with engine @ regular warmed up temps). Fix them if they're weak. The cap, rotor & wheel, and the sensor have been replaced. That means module (70%), pick up coil (15%), coil (10%), or distributor worn so that pick up isn't What is a 350 TBI Ignition Module, and How Does it Work? The 350 TBI (Throttle Body Injection) ignition module is an electronic component that controls the engine’s ignition timing and firing sequence. Shop Crate Engines at Summit Racing. My '86 350 x has been a real trial. 94/1,50 valves and 65cc chambers, casting #14102193 and used on a 87 up 350. Started to notice a vibration while driving. It turns out that the cheap ones have a tendency to fail. LOTW29; Sep 14, 2024; Engine I have the truck listed above 350 TBI in it. the truck is throwing code 42 and 43 Here is a 91 Chevy 350 Weak spark and cluster issues. I have no spark at the coil. Basic tune-up proceduresair filter, spark plugs/wires, dist cap. D-1-0-N-Aug 19, 2024; Engine Performance + Maintenance; Replies 4 Views 654. 88 chevy 350 TBI, I was told when I bought it that the engine was a few years newer than the original. Jump to Latest 14K views 4 replies 2 participants last post by thetimadator Nov 14, 2008. I have an 87 GMC V1500 350 TBI that I cannot make any progress with. Pull a couple spark plugs and see if they have any dark pepper like specs on the insulators, if so Buy NGK V Power Spark Plug UR4 (8 Pack) for CHEVROLET P20 1976-1984 5. I know at the time the engine was made, platinums didn't exist (I dont think?) anyway it didn't come with them. Did not replace cap and rotor, fuel filter, or distributer, but new plugs and wires. A fresh set of spark plugs would improve the acceleration and engine response of your car or truck. I have a 1990 350 tbi that runs great cold. so tell me if im wrong with this. what could be my problem? 1988 Chevrolet C3500 pickup; 5. Top. Someone suggested the ignition coil, so we went and bought one, but that didn't work either. Everything I do to it makes it better but doesn't fix it. Still not starting up. Pulled off the air cleaner, saw it was spraying fuel fine, pulled the plug off the coil from the power source and didn't seem to get a spark, no to the distributor. Hello. Also possible is dirty injectors, which can stick open, old O2 sensor(s) which get lazy and slow down in response time, or a weak ignition coil, among other things. Check the spark from the coil with the spark tester first. Installed stock rebuilt engine a few weeks ago. Somewhere dark or shielded from light, the spark should be easy to see. 035 in. 1995 350 TBI spark plugs. Now here is my problem. 7L 350 engine; TBI fuel injection; NO SPARK Help us help you. 1989 Chevy k1500 5. Ignition Coil. if not it will give you false counts. I didn’t remember the engine being cold making a difference. I started my plow truck the other day and it started up normally. My 1990 K1500 350 TBI recently had a NO START condition with NO spark and NO fuel spray at TBI. Jump to Latest Also try to get a spark tester like a st125 this will tell you if there is a problem with the spark strength running with weak spark will give problems. Understanding its grounding The ignition coil transforms the battery’s low voltage to a high 2. In this article, we will explore the most common symptoms of a faulty knock sensor and the steps you can take to identify and resolve the issue. Thread starter black92si; Tested spark at plugs and coil no spark. I knew it was zero. D. 2. The tests shown in this video can be used on most ignition coils with the exception of the 3 and 4 wire coil over plug systems. The problems started a few months ago when my son called and said it had quit on him while driving down the road. This system utilizes electronic components to control the ignition timing and spark delivery. Jump to Latest 21K views 8 replies 6 participants last post by WICruiser Apr 18, 2017. Been awhile since I posted on here but I'm having an ongoing intermittent issue with my 95 TBI 350. SlickBro26; obs_roger; 0xDEADBEEF Customer: Hello. 260 HP TBI Long Block Crate Engines with qualifying orders of $109. Testing for a weak spark requires pulling the plug The 350 TBI knock sensor symptoms can be tricky to diagnose, but they are critical to the performance of your engine. The coil and spark plugs have been replaced also. Jan 1, 2012 #6 take off the distributor cap and turn over the engine and watch and see if the rotor is spinning that will answer that. If you are interested to know what the gap of the spark plug is for a chevy 350. Joined Jan 18, 2011 Posts 1,170 Reaction score 18 Location Atlanta Area, GA First Name Derek Truck Year 1987 Truck Model R-10 Custom Deluxe Engine Size 350. thetimadator Discussion starter. No spark. 6,777 Satisfied Customers. the truck is throwing code 42 and 43 Here is a list of parts I have recently replaced: Fuel sending unit with new pump. This is not the first time its happened, but the fix was simple. If there is, then the ECM is I'm leaning towards fuel being the problem, not spark because it should be missing rather than sputtering if it were spark (excluding timing issues). The spark plug wires, distributor, cap and rotor are a couple years old and appear in very good condition. Truck sat for about 7 yrs and am getting it road ready for my nephew. There are a few different reasons why your 350 TBI might be backfiring. Got the truck home and started with the basics. 91 Chevy 350 Weak spark and cluster issues. so any deviation results in weak acceleration and reduced power. I just didn't see it in the daytime. Send Private Topic 1987 Chevy 4X4 350 TBI Email Report 1983G20Van Super Senior Member Posts: 3997 Loc: Hurst, Texas, USA Reg: 11-13-02. Hello everyone I'm new to the forum and having a no spark issue. I put her in first and take off. I have replaced If you aren't getting spark while it's cranking, it's not the ECM. Aug 21, 2024. Replaced ECM engine started and ran. I have replaced the coil,ICM and it has a whole new Dist as of 6 months ago. There is power into the coil and out to the distributor but nothing after that. Maybe its an issue with a batch of gas too. 7,421 satisfied customers. If not, then check the basics - vacuum, FP and spark (especially spark wander if this a high mileage motor. Increasing the ignition dwell time. uidvsffrzyqamuvzaunrgxiutvspbrygejdvjpkkmzjmhudsrgl