350 Tbi Stumbles When Cold

An idle stop screw is set at the factory and then covered to discourage tampering. The engine runs fine when cold but as it warms up it starts to "surge" at idle and when you come to a stop it acts like it wants to stall then it grabs. A closed choke can be determined due to the smell of gasoline from the engine compartment. Works with any fuel injection really since most shops really can't properly diagnose unless computer just tells them what is wrong and unfortunately with TBI that usually doesn't happen. i need to REALLY rev it and ride the clutch for it to break its inertia and build momentum. The aging systems were the 'stumble' I had. ZZ4 350 Base. Connect the emissions elbow on your air intake system to the one on your valve cover using a length of fuel line. The timing, fuel delivery, even compression all checked out. I pulled the air cleaner cover off and found no gas coming out, during cranking not familiar with tbi, but with carbs one can see it usually. stall My 1995 Chevy k1500 Silverado 350 V8 stumbles and hesitates when i take off from a stop, it idles fine and runs fine after its moving but off the line it seems like it almost wants to stall. If I push in the throttle even 1/8th of the way in it just sputters and runs like crap. I put a k&n air filter on it, complete tune-up, ran some injector cleaner through it, and a flowmaster dual exhaust. manual says WOT rpm should be in the 4200-5000 range for my 350 tbi. I have to wait 5 - 10 minutes before I can take off after starting it. made a huge difference, almost no hesitation. I have observed the RPMs on P. Your engine either seems to bog down when you hit the gas pedal, or it takes a second or two to respond. 1990 chevy c1500 hesitation and stumbling during acceleration Unresponsive to gas peddle at times and has major dead spots. brbuildcare. After examining the flywheel teeth, and gapping the plugs to the recommended manufacture gap, (they werent when we pulled them), we got a new starter installed. This 1987 Chevrolet K10 4x4 pickup embodies that philosophy perfectly, offering an ultra-straight body, nice blue metallic paint, and a minimum of add-ons that clutter the design. I pulled the air cleaner cover off and found no gas coming out, during cranking not familiar with tbi, but with carbs one can see it usually. Discuss 1994 z71,350 TBI surging idle when cold in the alt. Each TBI has a complete one year warranty. The injectors look like the are spraying good. I've already replaced the fuel pump, the problem is still there. I think that when the wires get old they leak from the rubber insolator that covers the spark plug and when the engine is cold ( time of great resistance) the spark jumps and shorts out the spark. Problem is when I first start the truck in the morning (or after sitting awhile) and go to take off, it will chug, bog out, or barely go for a few seconds, then snap out of it and run fine. Engine's are inefficient when cold and will require a lot more fuel, so that may be what's masking the symptoms until warm. if you get a gauge designed for sequential fuel injection with high fuel pressure 50+, the graduations are not calibrated correctly for your low pressure TBI system and you could get skewed results. I have also experienced lack of low end power lately when I take off from a stop. 3L or 305 to a 350 then you certainly need to change it as they are different. I am new to the forum and so far have found lots of really good advice, however nothing that has solved my problem. Have a helper turn the key on when you are ready. TBI Fueling Introduction: Second only to the stock TBI ECM, the stock TBI fuel delivery system leaves a lot to be desired. for a GM TBI application to read the data, or to check for stored codes. With 350 V8 power, a bunch of options, and a great look, it's the ideal all-purpose hobby vehicle. When i first start the truck it slowly rises from 1000 to 1500 rpm then comes down after five minutes to 1000 rpm then when i drive it for a few minutes then it starts idling at 1100 rpm when the truck. Bog/stumble on acceleration Hi folks, When the truck is stopped and in gear, and I put my foot lightly on the gas, I'll get a stumble or bog - like the timing suddenly retards - and then I'll take off quick, as soon as the engine is out of that little area around 1000-1200 RPM. Re: Stumble, Hesitation, Bucking, Hard to start, Stalling, Jan 04 2012, 7:32pm The lockup converter could not be unlocking, which would act like a manual transmission if you were slowing and not down shifting or not pushiong the clutch in. 8L stumbles/misses/bucks when accelerating, under load or climbing Problem Solved! - So, my 1995 5. After it makes the popping noise, the rpms will drop dramatically and sometimes it quits. Find great deals on eBay for tbi air intake. Have a helper turn the key on when you are ready. It has a bone stock engine, a Jasper rebuild, and with about 100,000 miles on the rebuild has developed a cold start stumble, and a very strange ongoing stumble/shudder/miss when cruising at low load. I have a 1991 K2500 with the 5. The truck has 190K miles on it and runs fine other than a misfire. This is a known issue with both vehicles. Automatic Transmission Problems of Ford F-350 - part 1 Ford F-350 owners have reported 64 problems related to automatic transmission (under the power train category). 7L 350: Cam & Lifter Kits - Amazon. The engine runs smooth at idle, no backfiring, no missing. I've gone with Vortec heads on my TBI with a carb intake (no coolant passage under the runners) and headers (no heat pipe to air cleaner) so even with my AE dialed in when up to temp, in cold weather and especially with a cold engine I get a nasty lean stumble on accel. Shop huge inventory of Used 350 Chevy Engine, Chevy 350 Engine Rebuild Kit, Rebuilt Chevy 350 Engine Rebuilt 350 TBI Chevrolet Complete Truck Engine. If it doesn’t seat all the way because of carbon build up or if the valve seat is leaking, it will cause the problem you’re talking about. The stumble/hesitation at 3000-3500 is still very much present. With TBI the fuel pressure only needs to be 10-15 with 12-13lb's normal. cold starts are ok. The engine runs fine when cold but as it warms up it starts to "surge" at idle and when you come to a stop it acts like it wants to stall then it grabs. Specs for GM TBI is 11 PSI. Keep in the back of your mind, though, that the reverse can happen- the engine is actually hot, but the ECU thinks its cold! 7. Re: Stumble, Hesitation, Bucking, Hard to start, Stalling, Jan 04 2012, 7:32pm The lockup converter could not be unlocking, which would act like a manual transmission if you were slowing and not down shifting or not pushiong the clutch in. delay/hesitation when start the engine my 1999 e320 at 165k miles runs smooth and no malfunction code. Painless Wiring makes the conversion from Carburetor to TBI real easy with there fuel injection wiring harness and a parts list of everything you need to make the switch. I was reading a thread from January 2007 in which several senior members [beech & stonebreaker] seem to say that this fuel injection system [ECM reprogrammed] can be used in the marine environment. The kayaking time record for this trip is 9 hours and 24 minutes and was set in 2014 by John Willacy. The carb I am using is a NOS Holley 9834-1 Here is what happens: Car starts fine hot or cold. You can use a late 80's or early 90's GM TBI definition. Definitely not the EGR, comp. I pulled the air cleaner cover off and found no gas coming out, during cranking not familiar with tbi, but with carbs one can see it usually. I have drained out the stale gas and chemically cleaned the fuel supply from the tank to through the injectors. However the OP problem in my opinion is more than likely bad plug wire or shorted plug wire or bad boot. Chevrolet would give this engine the RPO code of L83. Then there's the EGR. If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon acceleration, more than likely the carburetor needs an adjustment to the accelerator pump assembly. Full Metal Power Stage 2 Air Intake System by aFe®. Cold start rough idle on a TBI 350. As the engine warms, the IAC counts should decrease. It had some similar issues. This will provide gains until the rpm at which the neck becomes the greatest restriction. I got the engine timed to the 6 before TDC GM spec. i with a 600 holley. Permatex Sponsors StarCom Racing Team at NASCAR's Bristol Night Race. stall My 1995 Chevy k1500 Silverado 350 V8 stumbles and hesitates when i take off from a stop, it idles fine and runs fine after its moving but off the line it seems like it almost wants to stall. The kit is made up of almost all GM TBI OEM parts and includes the following: GM Throttle Body. The motor had some serious punch to it as well. When one or more cylinders stops firing, the power cuts, and the vehicle hesitates under acceleration. 7L, TBI, 260K on the motor at idle, it's extremely high, around 1600-1800 RPM's when put it drive, drops down to about 1000-1200 (still way too high) I've put a new IAC (idle air control) valve in, checked my timing. It has an edelbrock performer package (cam/intake/carb) it has a mechanical fuel pump. I have a 91 Silverado K1500 4x4, 5. the reason i say this is, there is an flap inside the snorkel, that is suppose to close at cold engine temps, so that the tbi gets warm air from your exhaust manifold, and as your engine warms up, the flap opens also not sure if you have this on this truck, but worth checking. GM TBI Swap. Take the truck to someone who has a scan tool and can read live data. However, it has this delay or hesitation when I turn the key trying to start it. I have adapted internal tank NAPA GM Pump (20 GPH), but the engine seems to run out of gas at medium to wide open throttle. Re: 87 Chevy 350 TBI low Idle issue I had the same problem you described many years ago with my 87 350 FI 4x4 and after two mechanics played with everything with no results, I took it over and left it at the GM tech school and they found that the distributor shaft had become demagnitized. Other forums claim they are too dangerous and I have to get a marine designed TBI injection system. Bad Gas Milege, Off Idle Hesitation/Stumble Blazer72 wrote: Well increased the initial to 18, went ported on vacuum advance, adjusted throttle plates, lowered total rpm to 2000 rpm. We manufacture and design many of our own parts. 7L 350: Cam & Lifter Kits - Amazon. ICM? I just got this truck today, ran it for three hours hot no problem, but sure enough (I was forewarned by po) as soon as I turned it off it wouldn't start (cranks fine). One thing that can cause this problem is a defective coolant temp sensor for the computer. ATK HP31 Chevy 350 87-95 TBI Base Engine 290HP, Call 866-721-2315 to Speak with an ATK Crate Engine Specialist. I hate to sound like a broken record, but on a Chevy TBI engine, the timing needs to be at ZERO. It may be a problem to choose a new carburetor for it because there are many carburetors that fit Chevy 350 — so here I’ve collected 10 best carbs in order to make your life easier. 7L TBI My truck has a rough idle when its warm, and misses when its cold. It seemed to make sense since from 1975 until 1980 the L82 4-bbl 350 CID V8 which was rated at between 205 to 230 horsepower (from 1975-1980) was the. It will be the other elements that you will find your returns, cold starting, transitional performance characteristics and probably smoothness if you don't keep the carb tuned. we had the same problem with a 93 tbi 454. I have a 95 hoe 4x4 with the 350 TBI and on a quick throttle push it has like a 1-2 hesitation before it takes off when the engine is warm and the check engine light comes on. It's critical that it gets a good 12V from the ignition to send that initial injector fire signal. The EGR valve took care of a "check engine" light problem, but nothing seems to clear up a rough idle when the engine is cold or heavy ping when the engine is hot and pulling hard on a grade. If you are referring to a Chevy 383 made from a 350 block with a 400 crank, it would always make more torque than a 350. Not finding what you're looking for? Save 350 tbi cold air intake to get e-mail alerts and updates on your eBay Feed. I can dump gas down the intake and it still will not start. With 350 V8 power, a bunch of options, and a great look, it's the ideal all-purpose hobby vehicle. 3 Stumbles on acceleration, rough running. I'm using the stock internal regulator in the TBI unit. The complete TBI system comes with all components needed for a closed loop system except for air cleaner, throttle cable/linkage, and fuel lines. com : Car complaints, car problems and defect information. It has an edelbrock performer package (cam/intake/carb) it has a mechanical fuel pump. GM TBI Swap. I was going to trace EVERY SINGLE wire today, but I'll have to wait for the rain to stop (at least the rain will open some of our off-road areas!!!) I had discovered a lot of unknown wires when I removed my old computer. 1990 TPI 350 stumbles - posted in Third Generation Pontiac Firebird (1982 - 1992): Hello. In addition to the above improvements, the TBI kit simplifies the under hood area by. move around causing the stumble. I have a 1995 chevy k 1500 350 tbi it hesitates when trying to accelerate changed plugs wires cap and rotor it dose have aftermarket tbi and performance intake it dose it hot or cold thanks Posted by midget_85 on Sep 22, 2011. A closed choke can be determined due to the smell of gasoline from the engine compartment. com: 350 tbi intake. A side reward was also better power at the lower rpm ranges. When I upgraded from standard brakes to a dual. The stumble/hesitation at 3000-3500 is still very much present. I think that when the wires get old they leak from the rubber insolator that covers the spark plug and when the engine is cold ( time of great resistance) the spark jumps and shorts out the spark. Notice: Undefined index: HTTP_REFERER in /home/rongbienkfood. i have a 87 ranger 2. Ran great in Moab for its first time out! After I came home I'm having some issues. Problem: With the engine running at idle, always when cold, intermittent when hot. I also listened for fuel pump humming and I heard that. 7L TBI intermittently stumbles/stalls at idle, and frequently falls flat on acceleration down the road. Print See Figure 1. If you are referring to a Chevy 383 made from a 350 block with a 400 crank, it would always make more torque than a 350. There are always questions posted about how to cure hard starting, hot or cold. This 1987 Chevrolet K10 4x4 pickup embodies that philosophy perfectly, offering an ultra-straight body, nice blue metallic paint, and a minimum of add-ons that clutter the design. I have a 1995 chevy k 1500 350 tbi it hesitates when trying to accelerate changed plugs wires cap and rotor it dose have aftermarket tbi and performance intake it dose it hot or cold thanks Posted by midget_85 on Sep 22, 2011. When the engine is hot my problem starts. I'm running an inline TBI fuel pump made for this motor. when i drive around town. Won't start hot*, starts right up cold. 350 MAG EFI 1996–1997 0F800500 0K001509 TBI MEFI 1 & 2 4 350 MAG MPI 1995‑1998 0F415189 0L339999 MPI MEFI 1 & 2 4 350 MAG MPI 1999–2001 0L340000 0M299999 MPI MEFI 3 4–5 350 MAG MPI MCM 2001–current 0M300000 Current MPI ECM 555 6 350 MAG MPI MIE 2001–current 0M310000 Current MPI ECM 555 7 Black Scorpion 350 MAG. now if you have a 383 or 350 with at least a level 5 camshaft then you may need to use the PCV valve that GM uses in their ZZ383 crate engine. I have a 1995 chevy k 1500 350 tbi it hesitates when trying to accelerate changed plugs wires cap and rotor it dose have aftermarket tbi and performance intake it dose it hot or cold thanks Posted by midget_85 on Sep 22, 2011. Ford E-350 Misfire, Hesitation, Rough Running from Engine, Notably After Ignition Wire Replacement - 5 reports. It sounds like the engine is temporarily flooded on hard accel. Figuring with bow trimmed down at WOT, the fuel and timing is where it needs to be. Serving our valued customers for over 30 years. Hey guys I know it's not Jeepster but there is alot of strong experience in this board and the fullsize board is pretty small. Consult a service manual or see below for any check engine light code definitions. Back in the early 1980's when the TBI system was on the drawing board, gas was at an all-time high (adjusted for inflation) and the 350 small block was on the chopping block. Troubleshooting TBI fuel injection. we had the same problem with a 93 tbi 454. If I push in the throttle even 1/8th of the way in it just sputters and runs like crap. It will still surge while parked and the throttle just slightly cracked. I have a 1990 Firebird with TPI 350 automatic. One other thing - on my Jeep at least, I'm pretty sure I needed a body lift to get the TBI unit to clear, but you may be able to get away without one if you have standard motor mounts (I do not). The old one was just 2 years old. Upon installation, traditional fuel starvation issues will be eliminated and you will enjoy better cold starting, improved MPG, better drive-ability and the ability to attack any angle on the trail without the fear of fuel loss. I have decided to create a page on trouble shooting TBI. 7 Idle surging,stalling in the alt. 1995 350 TBI Hesitation when giving gas thats a cake walk to fix just sucks its cold outside lol. I have changed the idle air Runs rough when cold - CarForum. I checked for any wild wires, and shook the wires of my ignition, TBI Harness, and could not get it to stumble. If anyone has been following my stumble/surge problem this very subject was the root of the problem. An OBDII code checker identifies defects in the exhaust system of the car. Air breather for Howell TBI. we had the same problem with a 93 tbi 454. One other thing - on my Jeep at least, I'm pretty sure I needed a body lift to get the TBI unit to clear, but you may be able to get away without one if you have standard motor mounts (I do not). This is all very taxing when working outside in freezing weather, that's why the pressure tests help so much. I'm trying to collect/archive stock GM/FBody EPROM images so that people have access to the stock code if they suspect their EPROMs are causing them problems, or if you're swapping engines/ECMs in your GM/FBody. Connect the emissions elbow on your air intake system to the one on your valve cover using a length of fuel line. 1990 chevy c1500 hesitation and stumbling during acceleration Unresponsive to gas peddle at times and has major dead spots. The thermostatically controlled air cleaner's job is to provide a carbureted engine with hot air when the engine is cold started. Buy Elgin Industries Torque/RV Cam+Lifters Kit w/TBI w/valve springs compatible with Chevy GMC 5. or just die out. made a huge difference, almost no hesitation. 454 TBI truck backfires on cold start for about 30 seconds « on: October 06, 2013, 10:15:30 PM » Since the weather is turning cooler and overnight lows getting in to 40's my truck the last few mornings has been backfiring out the exhaust pipes. I have searched the forums and found similar threads but nothing seems to fix my problem. I have checked the pickup coil, it is 834 ohms. 7L TBI My truck has a rough idle when its warm, and misses when its cold. Average failure mileage is 65,500 miles. For about a week now the 350 in my chevelle has been making a strange noise. A vacuum gauge attached to the intake manifold reads around 7 at idle when it should be around 15. Back fire could be a cross firing on a cyl when the exhaust valve is open or some gas accumulation in the exhaust system from one cyl not firing. The TBI unit (NOS) was replaced with the rebuild several years ago. This page is for information about GM Throttle Body Injection EFI swaps. 350 motor 4L60E trans Motor wants to stall while in gear (but doesn't do it out of gear once over 1000 rpm it dosent) seem to stall and it is only from a dead stop. The injectors look like the are spraying good. Its legendary status is based on an incredible performance level that is stone cold reliable. I have a 1991 K2500 with the 5. 0 4WD DRW 4. Chevy TBI high idle speed - why? I have checked all vacuum hoses, made sure the accellerate cable is free etc. 1990 chevy c1500 hesitation and stumbling during acceleration Unresponsive to gas peddle at times and has major dead spots. MegaSquirt Carb to EFI Conversion - Part 1: TBI Fuel Only From Carb to EFI on just a fistful of dollars… Updated 3/3/09 - Added dyno chart showing comparison of readings taken on old vs new dyno. CarComplaints. This causes the DME computer to supply a much richer mixture to the engine (a hot engine atomizes fuel better). 454 TBI truck backfires on cold start for about 30 seconds « on: October 06, 2013, 10:15:30 PM » Since the weather is turning cooler and overnight lows getting in to 40's my truck the last few mornings has been backfiring out the exhaust pipes. Also, on the scan tool, there were no codes set and all other engine parameters were within spec. Skip to main content. The Chevrolet Performance Vortec TBI Intake Manifold is designed to deliver maximum horsepower and efficiency with throttle body fuel injection and EGR usage on small-block Chevy engines. Any ideas would be great thanks. 88 camaro 350 tbi stumbles and stuters when i start driving up hills or a pass? i have to pull over every 25feet or so or crawl at like 15 miles an hr to make it up the hill, then i guess its ok on flats but feels pretty sluggish. I've already changed the cleaned the thriller body, changed fuel filter, spark plugs/wires. I have an edelbrock 1406 series electric choke, 600 cfm carb on my sbc350 and I have always had hesitation issues with it if you accelerate hard. Re: Hesitation when giving 'er the throttle I have the same engine, 1984 model, with the same issue. One thing that can cause this problem is a defective coolant temp sensor for the computer. The fuel pressure regulator is set for approximately 12 psi (30 psi on '94 & '95 BBC trucks). Each TBI has a complete one year warranty. Trent Boult and Tim Southee both produced superb overs to put New Zealand on top at lunch, reducing Sri Lanka to 144-6 before the rain that has disrupted the test returned, washing out the remainder of the day's play to leave just 66 overs bowled in the first two. This page is for information about GM Throttle Body Injection EFI swaps. 1989 Chevrolet C1500 Cheyenne 5. Problem: With the engine running at idle, always when cold, intermittent when hot. I got the engine timed to the 6 before TDC GM spec. 1995 350 TBI Hesitation when giving gas thats a cake walk to fix just sucks its cold outside lol. Re: 1995 TBI 350 with 214k stumbles a little at idle, otherwise runs great Took a 250 mile 5 hour drive today to get a Craigslist score of great condition wheels with 40% tires for $50. The PO told me the gauge didn't work and that it was the sending unit. Unplug the tan/black wire, time the engine to ZERO degrees and reconnect the tan/black wire. FAILURE SYMPTOMS Hesitation, tip in surge, engine pinging, no torque converter lockup. 350 over the 305,altogether separate from. However, if throttle body is replaced AND a proper idle speed cannot be obtained, there is an adjustment which may be made. There are many causes of TBI, including when the head hits the windshield during a car accident, an impact from a fall, sports or other recreational activities, or trauma from a nearby. Works with any fuel injection really since most shops really can't properly diagnose unless computer just tells them what is wrong and unfortunately with TBI that usually doesn't happen. The Chevy 350 in my buggy with TBI has the same hissing soundand I did have a stumble off idlebut my dad and I have done a bunch of work to it to get it to run better and now it doesn't stumble nearly as much. Home-Hamilton Beach Indoor -Removable Plates -Viewing Window Electric Grill-Searing ouemnv3352-discount low price - www. Looking for help please, 1998 5. 350 backfires through carb Hope somebody can help!Just rebuilt a 1972 chevy 350 with a new crankshaft,edelbrock torquer plus cam,torker manifold,holley carb,. GM Throttle Body Injection 1987-93 LO3 (5. But you also need compression and the correct spark timing. The backfiring and hesitation eases somewhat when the engine's warmed up, but it will do it every time, warm or cold, between 1900 RPM and 2800 RPM at half to full throttle in second, third, and fourth gears. I also listened for fuel pump humming and I heard that. As far as crate engines go, this one is a winner. In addition to metered street parking, there are three nearby public lots and many nearby hotel lots. This is all very taxing when working outside in freezing weather, that's why the pressure tests help so much. Discuss 1990 TBI 5. The complete TBI system comes with all components needed for a closed loop system except for air cleaner, throttle cable/linkage, and fuel lines. It gets a signal when cranking from the ignition switch to fire the injectors. The injector spray looks normal while it is doing the surging thing. It acts as if it is starved for fuel until it gets warm. but it runs great when accelerating or about 60mph and faster almost like nothing is wrong with it. I also listened for fuel pump humming and I heard that. Originally a 305 TBI, it now has a brand new GM performance 350 short block with 113 casting Corvette heads, Holley 300-66 TBI intake, and Holley TBI throttle body with 85lb/hr injectors (professionally cleaned and flow tested for proof), and LT4 Hot Cam kit. Ford F-350 Super Duty Engine hesitates during acceleration Inspection at your home or office. I did not have a chance to really let it warm up (it was cold and raining). I was going to trace EVERY SINGLE wire today, but I'll have to wait for the rain to stop (at least the rain will open some of our off-road areas!!!) I had discovered a lot of unknown wires when I removed my old computer. New and Remanufactured Throttle Body Assemblies for 305, 350, 454 Chevy, GM, GMC Trucks, Cars, Vans and 6 Liter and 7 Liter Trucks. It had some similar issues. 88 camaro 350 tbi stumbles and stuters when i start driving up hills or a pass? i have to pull over every 25feet or so or crawl at like 15 miles an hr to make it up the hill, then i guess its ok on flats but feels pretty sluggish. Cold start rough idle on a TBI 350. Clean is the right word for this Chevy. My chevy 1987 chevy Scottsdale with a 350 tbi sometime runs smooth then sometimes runs like its running with half the power or less like it has bad gas or something. 3L or 305 to a 350 then you certainly need to change it as they are different. This project started because I found out a buggy EPROM in my '85 TPI Z28 was causing a hesitation in [email protected] Average failure mileage is 65,500 miles. There are always questions posted about how to cure hard starting, hot or cold. Update Throttle hesitation Hellowell we got a big dump of snow this weekend so i didn't take the car into my shop, but i did do some of the stuff in the garage at home. But you also need compression and the correct spark timing. like everyone else today i cant take it to ford house and let them try to figure it out cuz of $. The fuel pressure regulator is set for approximately 12 psi (30 psi on '94 & '95 BBC trucks). I've already replaced the fuel pump, the problem is still there. An OBDII code checker identifies defects in the exhaust system of the car. I think that when the wires get old they leak from the rubber insolator that covers the spark plug and when the engine is cold ( time of great resistance) the spark jumps and shorts out the spark. The General Motors Rochester Throttle Body (TBI) is OEM original equipment. The Chevy 350 in my buggy with TBI has the same hissing soundand I did have a stumble off idlebut my dad and I have done a bunch of work to it to get it to run better and now it doesn't stumble nearly as much. All cars made in 1996 and after are equipped with an OBDII interface. It's certainly not as big of a hesitation as it was prior to timing, but I can feel and hear it. chevy forum at Car Dealer Forums; I have a 1994 Chevy z71 with a gm crate motor that has about 30k. Now, I am here because I have a problem -- it is an '89 Chevy G20 (3/4 ton) conversion van with a 5. Just curious what the thoughts are on reliability of this system, common problems, likeliness to get stranded by 25-year old electronics, etc. It has a bone stock engine, a Jasper rebuild, and with about 100,000 miles on the rebuild has developed a cold start stumble, and a very strange ongoing stumble/shudder/miss when cruising at low load. LS460 and LS600h hesitation on acceleration and/or P2119 CARspec is hearing increased complaints of hesitation when accelerating from Lexus LS460 and LS600h owners as the cars age. Problem is when I first start the truck in the morning (or after sitting awhile) and go to take off, it will chug, bog out, or barely go for a few seconds, then snap out of it and run fine. As the engine warms, the IAC counts should decrease. If you have access to a scan tool use a hook up for a 1990 350 cu. hello 1987 TBI with a manual transmission ***** low power. The Chevy 350 in my buggy with TBI has the same hissing soundand I did have a stumble off idlebut my dad and I have done a bunch of work to it to get it to run better and now it doesn't stumble nearly as much. Sounds fuel or vacuum leak related to me. 7 Idle surging,stalling in the alt. According to hiperformer. Spark comes from the ignition system. Performance Cold Air Intake Kit with Red Air Filter for 1988-1995 Chevrolet GMC Engine 4. When i start it cold (under 170) it starts fine then the afr backs down to 10. 86 cm) in width consisting of a stylized purple mountain range of three peaks surmounted by a silver rope annulet, overall a medium blue stylized wave inscribed "SEND US" in silver, all surmounted in base by a black sword and a green olive branch chevronwise reversed. RTH diagnosing 1990 350tbi stumble/stall when warm. I also listened for fuel pump humming and I heard that. Rough Idle When Starting Cold, Then Goes Away When Engine Is At Operating Temperature More Details Below I have an older, low mileage vehicle with a V8 engine. Removing Idle Stop Cap from a GM TBI and Adjusting the Idle Set Screw. Kit allows you to remove the cold start injector from your TPI intake. 1989 Chevrolet C1500 Cheyenne 5. When in drive however, I encounter hesitation when1)accelerating from low RPMs2)cruising at 55 mph, for example, and trying to increase mphor 3)when I "kick it", it takes a good second or two for the engine to respond. Re: Stumble, Hesitation, Bucking, Hard to start, Stalling, Jan 04 2012, 7:32pm The lockup converter could not be unlocking, which would act like a manual transmission if you were slowing and not down shifting or not pushiong the clutch in. Each TBI has a complete one year warranty. Any ideas would be great thanks. If this a 350 fuel injected car, then in the throttle body is an item called a choke heater. Maybe a cracked/warped intake, Throttle Body, etc. Engines covered: Pre-Optispark small block Chevy V8s with TPI or TBI injection and HEI ignition with electronic spark timing (seven or eight pin HEI module) Much of this article will apply to other 1980s era GM cars including injected big blocks and even fire V6s. Then in 1988, the TBI systems started. This causes the DME computer to supply a much richer mixture to the engine (a hot engine atomizes fuel better). Still no luck. When I upgraded from standard brakes to a dual. Discuss 1990 TBI 5. it only happens after truck is warm. stall My 1995 Chevy k1500 Silverado 350 V8 stumbles and hesitates when i take off from a stop, it idles fine and runs fine after its moving but off the line it seems like it almost wants to stall. 1995 350 TBI Hesitation when giving gas thats a cake walk to fix just sucks its cold outside lol. i with a 600 holley. Air breather for Howell TBI. 7L TBI My truck has a rough idle when its warm, and misses when its cold. 0L) and LO5 (5. When you start the car from a cold start it'll idle in the low 800-900 rpms, rev up a few times into 1100-1200 then idle fine at 1000rpms. I also listened for fuel pump humming and I heard that. I have an edelbrock 1406 series electric choke, 600 cfm carb on my sbc350 and I have always had hesitation issues with it if you accelerate hard. Check out these First Generation 1996-1998 GM Vortec fuel-injected 350 Engine Power Upgrades, including exhaust, throttle body, and more, at Sport Truck Magazine. Ok I have 2 V8 swapped Gen 1 S10 Blazers that run great but this is my 1991 C1500, first truck with TBI, that is giving me problems. For about a week now the 350 in my chevelle has been making a strange noise. What causes Hesitation and backfire on 5. When I start it, (starts every time) it takes about 3 seconds from cold start to fire up. I definitely feel more power. How to Cure Carburetor Stumble May 13, 2014 Dan Sanchez Fuel Delivery , How-To and Tech Tips , News , Tech , Tech Tips 1 Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. Will driving monitor the short and long term fuel trim,if the#s are high(135 or higher you are running lean and it is tring to compensate)also check o2 voltage and if it stays below 300mv check the ground for it at the thermostat stud or bolt. 350 motor 4L60E trans Motor wants to stall while in gear (but doesn't do it out of gear once over 1000 rpm it dosent) seem to stall and it is only from a dead stop. Shop huge inventory of Used 350 Chevy Engine, Chevy 350 Engine Rebuild Kit, Rebuilt Chevy 350 Engine Rebuilt 350 TBI Chevrolet Complete Truck Engine. Discuss 1994 z71,350 TBI surging idle when cold in the alt. Ford E-350 Poor Engine Idle, Stalling, Hesitation â€" Especially When Cold - 6 reports. stumbles on acceleration, WHEN COLD, idles fine, usually GRRR this is really pissing me off! Okay, the car is a '89 SE-i with a K&N stock replacement air filter. Chevy 350 stalls when put in GEAR? this car has a 75 engine and was built to race has a total ford 9inch rearend and a ratchet shifter, the engine has a nice cam{whatever that means} sounds loppy any ways in neutral it will idle around 6-8 hundred rpm, when in gear it stalls. Sustaining a concussion or any brain injury can lead to changes in cognitive abilities and control of emotions, mobility, speech and senses. Each TBI has a complete one year warranty. I did not have a chance to really let it warm up (it was cold and raining). It's critical that it gets a good 12V from the ignition to send that initial injector fire signal. The car would stumble as soon as the throttle was cracked open from idle. Check out these First Generation 1996-1998 GM Vortec fuel-injected 350 Engine Power Upgrades, including exhaust, throttle body, and more, at Sport Truck Magazine. 1: Runs fine at high speeds, but I can feel the engine surge a bit at 25 MPH, and at 5 MPH it is very noticable ! If I get out and disconnect the EGR Vacuum Solenoid power connector, problem gone. After doing some checking online I see thermostat temperatures listed for the TBI engines from 160, 180, 192 and 195. This aids fuel vaporization during engine warm-up. My problem is it is has to crank for a while to start when cold(5-10 seconds), and sometimes after a heat soak it will not start. Remove and clean the connection. I have a 95 hoe 4x4 with the 350 TBI and on a quick throttle push it has like a 1-2 hesitation before it takes off when the engine is warm and the check engine light comes on. "Send Us" Distinctive Unit Insignia. You currently have 0 posts. Generic TBI Fuel Injection Block Diagram & Acronyms Individual Components and Their Function We have covered the block diagram and acronyms and are now ready to take a look at the function of the individual components, and some general information about them, and how to procure them.