454 Tbi Runs Rough

Runs when gas is poured into the TBI. If your chevy gm tbi is running rich this will help you trouble shoot it and fix it Don't Forget to Subscribe today for more fact or fiction, diy ,how to car repair,spooky or funny videos uploaded. That shit is like wakin up a vampire with a boiled holy water and garlic loaded supersoaker. They said everything was fine and to expect some idle roughness. 3 TBI Blazer just started running rough and very rich won't accelerate no power. I have a 1995 26ft class a Damon Challenger on a Chevy P30 with 454 and TBI. For that period it was GM's answer to a carb and I think they worked better than a carb, but they came with their own problems. Drives like it has a momentary throttle stop and @wot. A visual inspection showed that new spark plugs, spark plug wires, ignition cap, and rotor have been installed. My Engine Turns Over OK But It Won't Start If your engine won't crank or turn over, go HERE. NOTE: If NOT Using MerCruiser Timing Tool: With engine running, set the scan tool or Marine Diagnostic Code Tool to the SERVICE MODE and follow manufacturer's instructions. Idels great and it will take of with just a tiny bit of throttle. If its running rough when cold it may be because of open loop its running in, the computer will use presets for fuel delievery, any vacuum leak or fuel delivery issue, the computer will not compensate for untill it gets into closed loop, probably a few minutes of running on that old of a vehicle. it also seems the longer i sit the worst it gets. Check from TBI vacuum plastic line all the way to the MAP sensor for a cracked line and repair if necessary. If you continue to have problems, it might be good to see if you can find an OBD1 scanner for your engine. The GM Performance Parts HT502 Emission Legal (50 state) Conversion Kit is designed for 1991-93 Chevrolet and GMC 10-, 20-, and 30-series trucks with two-wheel drive, originally equipped with a 454 TBI engine and 4L80E automatic overdrive transmission. First, let's pinpoint exactly what's going on. Should the speed of the engine idle need adjustment, we do it by diagnosing and correcting the things that cause it to be incorrect. The GM Performance Parts HT502 Emission Legal (50 state) Conversion Kit is designed for 1991-93 Chevrolet and GMC 10-, 20-, and 30-series trucks with two-wheel drive, originally equipped with a 454 TBI engine and 4L80E automatic overdrive transmission. Chevy Truck Forum. Automotive Recalls and Technical Service Bulletins for 1995 Chevy Truck C 3500 Truck 2WD V8-454 7. Stopped and the whole truck was shaking, reaked like fuel. 99 k3500 dually 7. When it runs rough I get alot of black smoke and the plugs when I checked them are covered in black soot. Sensor should read between 2. The wire colors are the same as the factory wire colors for car and truck TBI injected engines. If you try to choke or spray carb cleaner when running it tries to die. it starts fine, but shakes the truck at idle. Its a very strong engine, lots of poop and super simple, runs better than any stock Vortec I ever drove. It will drop down to about 35 (no acceleration available) then clear up and appear to run almost normal. SO what are some of the basic upgrades for a stock 87 TBI 350? My mom passed away back in 98 and he drove it for a little over a year and just parked it. For some, they may not see much difference between a car crash and a motorcycle crash, but not only do motorcycle accidents come with a much larger chance for severe injury, they also have more potential legal hang ups when victims seek compensation for it. Smoother, quieter, better throttle response, etc. Like the title says I have a 87 C30 w/454 TBI and 400th. 1993 454 TBI Problems!! × Help us help you. It smells like raw gas, smokes, and has no power to get started from a stop. Quite nice figures for a car with 4300 pounds, or what. 3L (W) L35 Engine. The truck has a 454 TBI Whenever you. No mileage figures yet, but I expect a slight improvement. I'd read from several sources that the V6 dual TBI can flow about 490 cfm. Help please! I have a 1994 winnebago warrior with a Chevy 454 tbi. I bought the truck and it was running rough. Including a Large Selection of New, Used and Surplus Engines for Sale. When it is about 55 degrees outside, then the add-on temperature gauge reads about 190 degrees. 3 4WD Vortec V6. First thing you do is change the exhaust i used factory headers they came off crate engines. and there was a hissing noise coming from TBI. The TBI motor also came in a 350 version in Chevrolet Caprice Classics. Plugs are gray with black on the insulators. I have replaced the fuel pump, distributor, coil, cap, rotor, plugs wires. 4Liter V8 in a P-30 motorhome chassis. Ensure you attach your vacuum advance line to the correct port on the EFI unit or you might have some rough idle issues. My email is [email protected] This can cause a hesitation, stumble and/or rough idle problem as well. it also seems the longer i sit the worst it gets. NO scan tool. Including a Large Selection of New, Used and Surplus Engines for Sale. 1985-1992 Throttle Body Injection Wiring Harness Installation. It may well be that these events are the hesitation & stumble problems described in this article. But still a 5. So you know your battery is good and the starter works OK because the engine turns when you try to start it. Manufactures have removed these adjustments on modern vehicles. If so, and the engine is running rough, then its a mechanical problem such. This is a discussion on 1990 rough running chevy truck within the Automotive Support forums, part of the Tech Support Forum category. One of the most common problems is likely a rough running or poorly idling engine. Testing on our 454 showed 15. I owned a 2000 Blazer and is running rough and chokes every time i hit the gas. I replaced the distributor and it ran again but was cutting out after about 30mim running time, and would not start after running Intel 30 to 45 min. Chevy Suburban/Tahoe Rough Idle and Stalling The vehicle runs great at speed and if you hold your foot lightly on the accelerator it will not die. The wire colors are the same as the factory wire colors for car and truck TBI injected engines. 3L V6 TBI EFI 1985-199 6CYL Blazer S10 S15 Jimmy Sonoma C K Truck Pontiac Red Cap: Distributors - Amazon. 1994 Chevy C1500 5. Published Dec 7th, 2015. any suggestions?. Chevy 454 Temperature sending unit location on engine: Luther: 7-11-07 : I have a 1993 Coronado with a Chevy 454 engine. I was told at a chat room that it is the EGR. It has 200k on it, and has a horrible low throttle input miss and a high idle at times. I can push the gas down enough that it will stay running but coming to a stop while pushing on the brake it isles down really low starts to lurch with the brake applied then will shut off. 3-Liter Vortec V6 The EGR valve on the Vortec V6 sticks open frequently as a result of carbon buildup. My father in law's '91 Chevy was running poorly, so we put new plugs, wires, cap and rotor on it, and it's running better, but it it still surging at idle. on my 454 TBI and have a AutoMeter gauge mounted on. It basically almost dies out, and then surges back to life (probably a little higher than normal idle), then repeats continuously until you apply some throttle. 7 TBI bogging down when getting on it - Chevy Message Forum - Restoration and Repair Help I got a 94 Chevy 350 motor it starts fine and runs fine but when I excelerate and give it a lot of gas it bogs down. If your chevy gm tbi is running rich this will help you trouble shoot it and fix it Don't Forget to Subscribe today for more fact or fiction, diy ,how to car repair,spooky or funny videos uploaded. When the valve is unseated, the engine should run rough, and the further you push the valve's diaphragm inward rougher running and/or stalling may occur. It was sitting for a year when i started to fix it. I am having a terrible time with getting it to idle smooth. This can cause a hesitation, stumble and/or rough idle problem as well. Rough idle but otherwise runs fantastic. I did a self scan of the emc and got code 32 from it so I replaced the EGR and it didn't fix the problem. I have backtracked fuel pressure, filter, pumps, etc. Recently rebuilt the 454 in my 1990 TBI Burb. I had my 2001 Striper with Volvo Penta 5. For that period it was GM's answer to a carb and I think they worked better than a carb, but they came with their own problems. 7 TBI bogging down when getting on it - Chevy Message Forum - Restoration and Repair Help I got a 94 Chevy 350 motor it starts fine and runs fine but when I excelerate and give it a lot of gas it bogs down. engine surges, low or lack of. Desperately need Info: what can I do ???? PLEASE. Two new injectors but wont release fuel spray. Im kinda new at this. Also in 1999 (when mine was made) all fuel inj car and truck motors (the 5. 454 Backfires - Problem Identified Recently I started experiencing backfires on my 454, so the first thing I did is read all the related threads posted on this board, and began checking the recommended items (carb, distributor, vacumn leaks, valve springs, etc). Another fuel system was introduced in 1992 called Central Port Injection (CPI) and appeared first on the 4. Had recently filled up and thought it might be bad gas. when i put it in park or nuetral it idle up but it still lopes. 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. If I push in the throttle even 1/8th of the way in it just sputters and runs like crap. Just got the MH running a couple of days ago with the rebuilt TBI, and let me tell you, there is a huge difference in the way the engine runs. I have seen throttle bodys for SBC with everything for 200. A 1977 vehicle that has a tank of gas burned througt its tank every few weeks from day one may have a clean fuel tank. Manufactures have removed these adjustments on modern vehicles. 1992 GMC Sierra K2500 SLX Ext. Background; Grandson drove truck 75 miles to my place backfiring and barely running. I have 2 connectors hooked up to the distributor. 00 Pertronix flamethrower distributor for bbc. Check from TBI vacuum plastic line all the way to the MAP sensor for a cracked line and repair if necessary. and re-chip it they run so lean its crazy. Just got the MH running a couple of days ago with the rebuilt TBI, and let me tell you, there is a huge difference in the way the engine runs. it only has 63,000 miles on original motor so it would be worth tuning up. Anyone can take it for what its worth. But if after testing, it is determined that you need a engine, We can take care of you at our facility. Craigslist Search, Craigslist is no longer supported. chevy 454 engine 96-00 model 4 bolt main roller block Remanufactured and Rebuilt Engines for Cars and Trucks. (I'm running the big one at the moment) The cam is a Comp Cams LT1 unit, the chip is custom from Brian at www. Since 1938, Edelbrock has manufactured its core products in the USA for quality & performance. My conclusion was that a -7747 ECU with a $42 mask from a ~1990 full size truck with the 454 and a 454 TBI setup would probably run the bigger Cadilliac motors well. One thing I do know that TBI engines do is hesitate from the EGR opening too soon. My 1992 GMC S15 4. Most but not all were non roller blocks with similar power numbers to the LO3. The cap had a crack in it so I suspected it may get worse with heat and I changed it. on my 454 TBI and have a AutoMeter gauge mounted on. Paul Gatto Explains Issues He’s Seen In Minnesota Motorcycle Accident Cases. Fuel pressure specifications 1. The purpose of this article is to highlight some of these common problems and how to fix them, so your mighty "Five-Oh" runs just as good, if not better than it did during the Reagan/Bush Sr. The 90s were some rough years for smog the engines were turds. I'm having problems with my engine which is a gen 5 454 tbi 220 model made in 1992. The car then seemed to run good until I went up a hill. It will drop down to about 35 (no acceleration available) then clear up and appear to run almost normal. Now for my question. Rough running Chevy 350 at the start then runs good? 93 Chevy TBI hard to start runs rough then clears up and runs fineIf you turn it off It runs rough again for a few minitesany suggestions?. Brians 2nd attempt, idled good, a little rough, but ran pig rich at or near idle. In order to adjust the TPS, you will need a scan tool (or laptop/PC running scan tool software) or a digital volt meter. Its a very strong engine, lots of poop and super simple, runs better than any stock Vortec I ever drove. I have a 1988 Chevy C3500 1 ton PU. MERCRUISER HORN WARNING SYSTEMS 90-898301003 JUNE 2007 Page 5 / 10 Models All MEFI-3 V-6 and V-8 Sterndrive and Inboards 4. 19 Answers. 7L) engines. You really should get the fuel pressure checked and it'll need at least 12lbs to start and run. Replaced the coolant temp. if it runs good going down the road then the ign. I swapped a TBI into my old Caprice, and I've found it to be a great system. When engine hot on the highway, when second venturi of carb is opened the engine seems to die momentarily. Its a very strong engine, lots of poop and super simple, runs better than any stock Vortec I ever drove. He could not ID the problem. [Archive] Page 4. It has 212,000 miles on it, a 305 TBI, and a manual five speed. The cap had a crack in it so I suspected it may get worse with heat and I changed it. If you try to choke or spray carb cleaner when running it tries to die. and re-chip it they run so lean its crazy. Now I'm just left with this problem: When it's hot, and turned off for a little while, it restarts great for about 10 seconds and then goes into a very rough idle and dies. Could it be a O2 sensor or fuel filter. My email is [email protected] If its running rough when cold it may be because of open loop its running in, the computer will use presets for fuel delievery, any vacuum leak or fuel delivery issue, the computer will not compensate for untill it gets into closed loop, probably a few minutes of running on that old of a vehicle. Background; Grandson drove truck 75 miles to my place backfiring and barely running. Engine Idle Is Too High Vacuum Leak. I'm having problems with my engine which is a gen 5 454 tbi 220 model made in 1992. it only has 63,000 miles on original motor so it would be worth tuning up. For that period it was GM's answer to a carb and I think they worked better than a carb, but they came with their own problems. What is the engine idle? Revolutions per minute, or RPM, is the most common measurement of engine speed. Restoring a Holiday Rambler 1988 coach with 454 V8 in P30 chassis. Bruce Recently returned from long trip and our 87 Coachmen started running rough under load. The truck runs pretty good. TBI is a fuel injection system that uses a pair of injectors mounted in a single housing that is mounted and functions much like a carburetor, except that the injectors replace the venturis, jets, air bleeds, fuel bowls, and floats. I can't see enough of the engine to be able to tell. If your chevy gm tbi is running rich this will help you trouble shoot it and fix it Don't Forget to Subscribe today for more fact or fiction, diy ,how to car repair,spooky or funny videos uploaded. 2 /Rebuild??? Intermittent loss of power (no stall) rough running: 2: MerCruiser 454 MerCruiser 470. 4l 454 tbi Have rough idle cold or warm. I replaced the distributor and it ran again but was cutting out after about 30mim running time, and would not start after running Intel 30 to 45 min. :grrrrrr:. Featuring 11 in stock!. Post truck shows, events and gatherings here. I bought the truck and it was running rough. 99 k3500 dually 7. Initial Calibration of the TBI Disclaimer The author of this presentation assumes NO responsibility for information provided causing the owner to modify or alter their motorhome which shall result in problems or mishaps. 01-03-05 08:29 AM - Post# 587050 In response to streetkit I don't have any specific suggestions for you, but you may want to move/post this in the 88-98 fullsize truck forum. 01-11-2011, 10:13 AM. if clogged with carbon or not adjusted right it will die. So, I took the truck to the local shop where I worked a few years ago as a full service attendant while in highschool. Widest array of chevrolet pickup and. It was telling the computer it was -30 degrees and filling the throttle body with fuel, flooding it out. 3 liter V6, as well as a 454 (7. Just within the last month, it has started to hesitate off the line when cold -- then runs ok when it warms and then it starts hesitating again when I have been driving for a longer period of time. Paul Gatto Explains Issues He’s Seen In Minnesota Motorcycle Accident Cases. OBDII is common for all U. 1994 1500 5. It had slightly reduced power compared to the L29 454 and used a different PCM. See the fault code links for more information. With the exception of firewall clearance problems in various vehicles, this should apply to swapping most any GM points type distributor to HEI. Hi guys!Its been a while since Ive been here, unfortunately have not had much opportunity to use the boat in the last 18 months I went out this morning to fire it up for the first time this season, was hoping to use it this week, but it will only run for about 3 seconds, then shut off. TBIs don't use the 02 sensor (open loop)until they reach a certain temp. It runs rich when it is running rough. 1994 1500 5. My engine is a modified Chevy 350 with ported double hump heads, roller lifters and lots of more performance stuff. I had both replaced, all 4 O2 sensors and the exhaust system as when one of the converters went it wrecked that as well. 05-19-10 02:12 PM - Post# 1917465 In response to mid tenn mike I will be VERY surprised if this ends up solving your problems. The purpose of this article is to highlight some of these common problems and how to fix them, so your mighty "Five-Oh" runs just as good, if not better than it did during the Reagan/Bush Sr. 89000 miles, truck runs great, always starts, etc. Fine tuning could be done once a baseline start was established. Automotive Recalls and Technical Service Bulletins for 1995 Chevy Truck K 2500 Suburban 4WD V8-454 7. Long story short , on a drive, coming up to a stop sign all of a sudden I noticed my idle drop way down. 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. You really need to get with one of the tuners on this site , datalog and let them help you get your vehicle to run right. 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. I have seen throttle bodys for SBC with everything for 200. Re: 88 Chevy K3500 454 TBI. The truck has a 454 TBI Whenever you. , that only affect the efficiency of the spark, but the. They said everything was fine and to expect some idle roughness. What happens if the MAP sensor is bad on my 1991 2500 454 TBI Suburban? What effects will be noticed. Plugs are gray with black on the insulators. if it runs good going down the road then the ign. This is in 5 degree increments, at least, in the case of marine engines prepared by Indmar for Mastercraft, Malibu, Supra/Moomba. So you know your battery is good and the starter works OK because the engine turns when you try to start it. Restoring a Holiday Rambler 1988 coach with 454 V8 in P30 chassis. and re-chip it they run so lean its crazy. How could spark plugs become black with soot? Dear Tom and Ray: I am hoping you can help with a problem I am having with my wife's 1967 Camaro Convertible. 4L/454 Standard Motor Idle Air Control (IAC) Valves and get Free Shipping on Orders Over $99 at Summit Racing! Standard Motor Products replacement idle air control valves help you get maximum fuel efficiency and powe. Quite nice figures for a car with 4300 pounds, or what. If your check engine light is on you more than likely have a hard fault meaning something is grounded out, unplugged, operating out of range or has gone bad. Now for my question. I've got a miss and hessitation when accelerating. A visual inspection showed that new spark plugs, spark plug wires, ignition cap, and rotor have been installed. 3 TBI VIN Z that runs way too rich. back to the tank or in the engine. Long story short , on a drive, coming up to a stop sign all of a sudden I noticed my idle drop way down. sensor was bad. GM TBI Swap. I have a 88 k3500 with a 454 engine. I am having a problem. After driving the truck for a minute or so, as the engine warms up, power drops off. The EGR valve was faulty so I replaced it. Bruce Recently returned from long trip and our 87 Coachmen started running rough under load. If I push in the throttle even 1/8th of the way in it just sputters and runs like crap. It may well be that these events are the hesitation & stumble problems described in this article. It's usually something simple. Then next day wouldn't start Put number one cylinder on tdc checked rotor in distributor and it was off one spot. 6 litre cars. The 1999 454 MPI which looks brand new with only 22 hours showing on the ECM makes a rather annoying and louder than expected hissing/whistling noise when I get on it. I replaced the distributor and it ran again but was cutting out after about 30mim running time, and would not start after running Intel 30 to 45 min. 6:1 roller rockers. The electronic throttle body fuel injection system is a fuel metering system with the amount of fuel delivered by the throttle body injector(s) (TBI) determined by an electronic signal supplied by the Electronic Control Module (ECM) or Powertrain Control Module (PCM). I’ve got twin 454 marine power tbi freshwstsrbcooled motors One motor runs great! Other motor was running rough. Any mechanics in the house? Best Answer: Check for a intake leak, and perform a pressure test on the all the cylinders. Very rough cold idle. If its running rough when cold it may be because of open loop its running in, the computer will use presets for fuel delievery, any vacuum leak or fuel delivery issue, the computer will not compensate for untill it gets into closed loop, probably a few minutes of running on that old of a vehicle. Chevy Suburban/Tahoe Rough Idle and Stalling The vehicle runs great at speed and if you hold your foot lightly on the accelerator it will not die. If you have the throttle just barely open it will smooth out until it upshifts then it does it again until the rpms build. Rough running Chevy 350 at the start then runs good? 93 Chevy TBI hard to start runs rough then clears up and runs fineIf you turn it off It runs rough again for a few minitesany suggestions?. Check connections and wiring. 454 Tbi Cfm. At the moment I have a TBI out of a 1990 Chevy, similarly ported and th eregulator cranked to max with a stock fuel pump pushin 15psi. The intervals of opening and closing are very short -- from one-fifth of a second when idling to two hundredths of a second at 5000 rpm -- so small problems can seriously affect engine performance. Our OEM Throttle Body Injection (TBI) Assemblies are complete and ready to install. My father in law's '91 Chevy was running poorly, so we put new plugs, wires, cap and rotor on it, and it's running better, but it it still surging at idle. 01-03-05 08:29 AM - Post# 587050 In response to streetkit I don't have any specific suggestions for you, but you may want to move/post this in the 88-98 fullsize truck forum. 7 EFI 350 MAG MPI 6. 7L V-8 and an automatic. Its a very strong engine, lots of poop and super simple, runs better than any stock Vortec I ever drove. My TBI 454 has been running rough. So since you all had a lot of good input on Troy's TBI problem Ill give it a whirl. Why does a 1993 Chevy pickup with a throttle body injected 350 run rough just off idle or under almost no load? TBI / Throttle body injection. History: It used to only do it when it got real warm like 200*ish then it would miss and sputter really bad with small throttle inputs but seemed ok if you got on it. [Archive] Page 4. The mechanic found a shorted wire that was preventing the injectors from firing. 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. The glue on the elbow near the TBI turned to liquid when the engine got warm and the hose would not hold a vacuum. I have backtracked fuel pressure, filter, pumps, etc. I did a self scan of the emc and got code 32 from it so I replaced the EGR and it didn't fix the problem. When the valve is unseated, the engine should run rough, and the further you push the valve's diaphragm inward rougher running and/or stalling may occur. It may well be that these events are the hesitation & stumble problems described in this article. Background; Grandson drove truck 75 miles to my place backfiring and barely running. Our OEM Throttle Body Injection (TBI) Assemblies are complete and ready to install. The truck does not miss fire and will run fine once warmed up. 2 /Rebuild??? Intermittent loss of power (no stall) rough running: 2: MerCruiser 454 MerCruiser 470. The truck runs pretty good. Fine tuning could be done once a baseline start was established. com The intake is Edelbrock for a carb with an adapter form a 454 TBI engine. You won't find this ebook anywhere online. I did find the rubber link hose to the MAP sensor and canister purge line were cracked which caused some surging while driving. Just got the MH running a couple of days ago with the rebuilt TBI, and let me tell you, there is a huge difference in the way the engine runs. Mine had a problem of running rough and starting hard, backfiring and missing. No revs with that so I moved on to timing. 4Liter V8 in a P-30 motorhome chassis. Chevy - Classifieds in Alamogordo, NM: 1978 chevy stepside complete, Chevy Chevrolet Engines, 2 1940 chevy, 1986 Corvette reduced, Chevy 4x4 3 lift kit. im trying to sell this truck, but i cant get it tuned up. A visual inspection showed that new spark plugs, spark plug wires, ignition cap, and rotor have been installed. Very hard to maintain an idle now on the truck and the conical spray pattern is thick and constant when the truck is running. No mileage figures yet, but I expect a slight improvement. Should the speed of the engine idle need adjustment, we do it by diagnosing and correcting the things that cause it to be incorrect. 3 injection, map sensor and computer even. Its a very strong engine, lots of poop and super simple, runs better than any stock Vortec I ever drove. Chevy 454 Temperature sending unit location on engine: Luther: 7-11-07 : I have a 1993 Coronado with a Chevy 454 engine. shut it down and walk awy till morning. Does transfer case speed tone wheel have different size's? LQ4 Mild Build Advice. GM Computer codes = no Got new battery installed. I know, im just suggesting. While the intake is off, it’s always a good idea to remove the valve and clean off as much carbon as possible to prevent rough idling. I've begged him for almost 15 years to sell it to me and he just wouldn't let it go. 454 loading up and pulsing at higher RPM's due to faulty TPS. I am just tired of getting stuck on hills and running poorly on rough gound. The engine fired up right away, but was running very poorly and eventually sputtered out. Good fuel pressure, good spark. I'm thinking of doing the same thing, new 350 in my 91 Sierra 4x4, considering it has 151,000 plus miles on it, mostly hi-way. 99 Mercruiser 250HP TBI Loss of Power - Repower 5. that has a rough idle, and will bog down on acceleration. One connector has a white wire and a red wire and goes to the coil. Good fuel pressure, good spark. only thing it has is a v8 dist. little high. The intervals of opening and closing are very short -- from one-fifth of a second when idling to two hundredths of a second at 5000 rpm -- so small problems can seriously affect engine performance. The truck does not miss fire and will run fine once warmed up. Troubleshooting your TBI Fuel Injection System Most of the problems encountered while installing your fuel injection system or after a time of operation are very simple. my truck does something similar. Used them to haul my BGF up and down the coast. I've got a 92 Blazer 4x4 4. On the coil-in-cap GM HEI, the coil is located on top of the distributor between the plug wire towers under a plastic cover. I need to tell the mechanic where it is. After it is warm it will idle slow and a little rough, almost to the point you think it will die. Now I'm just left with this problem: When it's hot, and turned off for a little while, it restarts great for about 10 seconds and then goes into a very rough idle and dies. Truck ran fine never had problem until now truck cranks fine and strong also fuel pump starts for 2-3 seconds then turns off left for 2 days came back would not start. 454 Runs Rough. I have a 1992 Chevy 1500 two-wheel-drive pickup with the 5. problem is that i cant seem to get the truck to idle or run correctly. Engine Hesitates, Stumbles, Lacks Normal Power The computer uses this information to determine how much fuel is needed to maintain the correct air/fuel mixture, and when extra fuel is needed if the throttle suddenly opens wide. While the intake is off, it’s always a good idea to remove the valve and clean off as much carbon as possible to prevent rough idling. 19 Answers. So I sprayed carb cleaner all over which did not change the idle. [Archive] Page 4. Fast Fuel TBI 4 Barrel High Performance Fast Fuel TurnKey or Fi-Tech 4 Barrel Fuel Injection System Turnkey Engine. Best TBI Mild to Hot Street! This is an excellent street machine engine, with a great OLD SCHOOL SOUND. TBI is a fuel injection system that uses a pair of injectors mounted in a single housing that is mounted and functions much like a carburetor, except that the injectors replace the venturis, jets, air bleeds, fuel bowls, and floats. 1992 GMC Sierra K2500 SLX Ext. that has a rough idle, and will bog down on acceleration. Featuring 11 in stock!. It's usually something simple. 7 Idle surging,stalling in the alt. He could not ID the problem. Brians 2nd attempt, idled good, a little rough, but ran pig rich at or near idle.