Chevy 350 Tbi Runs Rough When Cold



Then it started running so rich on a cold start that it will barely idle. ur egr valve if faulty and closed,wont hurt ur car, it just wont pass ur smog test and will be bad for the inviorment not to mention a very cold start in the mourning, meaning ur egr valve is prob faulty and u dont even know it, but if its stuck open due to carbon build up, ur idle will be rough,but still be good at acceleration, its easy to. about once every second or so. Quality of Construction This harness is constructed using OEM quality wire for superior reliability and long term use. 94 Chevy Silverado ( 350 TBI ) First fire up it runs like a champ for 5 minutes then it starts running rough. It's critical that it gets a good 12V from the ignition to send that initial injector fire signal. The Chevrolet small-block engine is a series of V8 automobile engines used in normal production by the Chevrolet Division of General Motors between 1954 and 2003, using the same basic engine block. The engine starts easily, runs fine while fast-idling down the driveway and down the street for a few miles, but then. Details: A condition of running rough can be one of many factors. Will not re-start, seems to be flooding at this point. The SES light was on when I bought the truck but this rough running and rich mixture thing began about three minutes after I started the truck today. The truck has a NV3500 so the whole truck would surge. 7 V8 GM crate motor. This can cause a hesitation, stumble and/or rough idle problem as well. On a cold start it's running in open loop. This has been a rear frame off build. First started drove about 100 feet started running real rough like half cylinders, dies and restarted half hour later running rough no codes: Fuel PSI at 60 with key on, Replaced ICM, coil, plugs, rotor, cap, Crankshaft Position sensor, Cam Position sensor, Fuel pump relay, Starter, ECM, checked fuses all good under dash. it turns over for a few seconds, then has a fluctuating idle until warm, once put in gear the idle speed lowers (no tach so not sure on rpms) and taking off from a stop it bogs out, stalls, sputters etc. Find CHEVROLET 5. 7/350tbi) running rich. Anyone can take it for what its worth. I’ve quite a bit of experience with old cars and trucks but the newer ones (yes, even 1987) give me trouble. Try not to use brake cleaner, the burnt fumes are TOXIC!! Do you have a TBI or TPI car? The TPI cars have a coolant line that goes through them for emissions, and if the throttle body is cold (for the first 5-10 minutes, the IAC is probably getting stuck, the TBI gets heated from the manifold but works in a similar fashion. V8 Swaps that work. Doesn't overheat. 7L 350, TBI, Auto, 220Kmiles Its been a great truck, for the most part it runs and drives great! but at low idle or low rpm's it missis,sputters,surges and if im just barely giving it any gas it almost wants to stall out. How to hop-up a Chevy 350 engine with a cam and fuel system. 91 350 TBI rough idle and no power at all a 91 chevy C2500 with a new rebuilt 350 tbi. 7-liter) small block V8 with a 4. It's a 1997 GMC k1500 with a 5. about once every second or so. Once it is warm, it runs good unless you try to accelerate real fast. Shoot compressed air into the throttle body to dry the spray solvent. No trades, no spam, if you see this add, YES it is still available. The ECM expects to see no voltage on the EST line during this condition. This engine will run on unleaded fuel. Had recently filled up and thought it might be bad gas. JEGS has the GM Goodwrench Chevy 350 for sale at a great price! Specifications. 7-liter) small block V8 with a 4. It was idling a little slow, but no stumbling or backfiring through the TBI. Official Chevrolet site: see Chevy cars, trucks, crossovers & SUVs - see photos/videos, find vehicles, compare competitors, build your own Chevy & more. This page is for information about GM Throttle Body Injection EFI swaps. Then it started running so rich on a cold start that it will barely idle. And when they get too wet, they can't make sparks and the car won't start. It runs awful until up to operating temp and still lacks power then. The ZZ4 350 Turn-Key crate engine has been one of our most popular high performance crate engines since we started GM Performance Parts. Although it runs when cold started, the engine "hunts" in RPM and engaging the tranny (700r4) will occaisionally cause it to die. This has been a rear frame off build. It runs fine at idle cold, but when you begin to drive it feels like it's misfiring or starved or flooded for fuel. ) For any changes needed, just call and we will build a custom engine package for you with the horsepower you want. Working on the rough idle problem When we were in town yesterday I purchased a new PCV valve for the van's engine. The carburetor delivers the air/fuel mixture to the engine, and the distributor ignites that mixture within the cylinders. When it's in park and i blip the throttle it falls flat on its face. My 1991 Chevy Silverado starts up ok, but has a rough idle until it warms up. the gauge should be still the same psi. Engine skipped occasionally and would pop-pop-pop under heavy acceleration. Now when its cold it runs really rough coughing and sputtering. When I start it, (starts every time) it takes about 3 seconds from cold start to fire up. Greetings all. It came from factory with a 5. They are knowledgeable and friendly. Again, runs smooth at idle and even Revs smoothly but only when the truck is in park. My truck has a rough idle that won't go away. The Chevy 350 engine is a 350 cubic inch (5. The engine starts easily, runs fine while fast-idling down the driveway and down the street for a few miles, but then. This page is for information about GM Throttle Body Injection EFI swaps. I had done one last fall but can't remember the number of quarts or the type of oil chevy recomends. The ECM expects to see no voltage on the EST line during this condition. Chevy 350 — 325/345 HP for Throttle Body Intake (TBI) (Computer Driven) ID #Chevy-15. All of this sounded good. 3 Stumbles on acceleration, rough running. They have just the Chevy TBI kit that you are looking for to get your hot Camaro finished without spending a fortune. The General Motors Rochester Throttle Body (TBI) is OEM original equipment. Going to test it in the morning when it's stone cold. After about 10 minutes when the engine is warmed up and I come to a complete stop the idle tends to fluctuate. Passenger Cars, Mini Vans, SUV Service and Repairs. Recently I changed the throttle body gasket and since then when I start it it runs really rough and. If I push in the throttle even 1/8th of the way in it just sputters and runs like crap. It will go from very low rpm's, about 500, and start studdering as if it wants to turn off then rev it. Don't miss what's happening in your neighborhood. 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. How to Test a Lean Condition. 5 tires on it. and sometimes backfires out of the carb. Rough idle? A good dousing with throttle body cleaner may be enough to restore your EGR valve to near-mint condition, transforming a harsh idle into a soothing hum. Well, it didn't seem to idle rough until a few weeks after we bought it haha. about once every second or so. have done at least 20 cams on those engines. Find 1987 Chevrolet Blazers for Sale on Oodle Classifieds. I have a 1994 Chevy S10 Blazer and after a trip i arrived back home and casually turned it off. Shoot compressed air into the throttle body to dry the spray solvent. Edelbrock is the most respected name in performance. I spec'd out the coolant temp sensor at warmer temps @ 175 and 150 and it's with in specs. Page 1 of 3 1 2 3 Next >. 1991 Chevy 1500, 350 tbi won't start. What should the valve lash be set at (cold) for the intake and exhaust valves? Also how do I tell when I have #1 at TDC? I should have set it at TDC before I put the cylinder heads on I guess, but I didn't think about it. Some Chevy vehicles include Silverado, Suburban, Cavalier, Trailblazer, Tracker, Tahoe, Cobalt, and more. Code 42 - Electronic Spark Timing Circuit (EST) Circuit Description. OK, I bought someone Else's problem. The carburetor delivers the air/fuel mixture to the engine, and the distributor ignites that mixture within the cylinders. 7 Runs terrible when hook to computer Page3 - Discuss Chevy High Performance, General Chevy Technical Discussion, and Chevrolet Tech topics in the Chevy High Performance forums at Super Chevy Magazine. Get it running and warm and it clears out and runs strong all day long with no further issues. So the problem seems to be that something is advancing the timing way out of range on cold start for 30 to 45 seconds, then it comes back to normal and runs fine. 71 chevy with 350 engine, edelbrock intake and 600 cfm carb setup, new HEI distributor put installed, 8mm spark plug wires. 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. New Quality Hand-Built in America Chevy 350 Small Block Engines for Sale for Your Street Performance Hot Rod, Muscle Car, or Classic Truck! Available in Short Block, Long Block, and Custom Crate Engine Packages. It idles terribly. It came from factory with a 5. Stumbles and runs rough at lower throttle positions (just off idle). 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. 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. I'm running out of ideas. 04 (still really rough) and it fouled all the new plugs the first time I had them gaped at. Chevy Forums FREE technical assistance for your restoration and repair. Truck has 6†suspension lift. In the "Old" days, that was a stuck choke. 3 Stumbles on acceleration, rough running. I've checked the timing and it's set at +2 degrees. Chevy 350 is backfiring/misfiring through the exhaust? It starts just fine but at an idle but smells like it is running way rich and when you rev to about 1700+ it starts to make popping sounds in the exhaust but stops when you bring it back to an idle. Hi i have a 94 chev k1500 350 tbi. You run quotes with the z06 are much higher values Is generated by a strong absorber of sunlight И просто помогает пользователям мудро справиться с жизненными ситуациями Companies that are being *** holes on purpose – april 24, 2013 2 photos 2004 (54) mg zr 1 Acquire automotive. I had a 90 model, had the fuel injector fuse blow once, also had an injector wire break that caused the truck to quit running. New inventory arriving daily. Going to test it in the morning when it's stone cold. Every TBI will be Flow Bench tested, calibrated, and idle adjusted making it ready for easy installation. " Diagnosing Engine Noises can be the most difficult thing a mechanic can do. Background; Grandson drove truck 75 miles to my place backfiring and barely running. I had the fuel pump replaced and have been using Lucas Injector Cleaner with every tank of gas. It still idles weird, I'm really starting to lean towards a misfire at idle, so I need to go unplug the wires 1 by 1 and see if I get no change on one. I just replaced the plugs about 3 months back and it ran fine after, people have told me things like it is the o2 sensors to the cat is plugged up to my fuel filter is bad. Re: 1988 Silverado 350 TBI Dies When Hot is the vehicle equipped with a check engine light and if so is it on? How about the crank position sensor? any indication of flooding when it starts back up, lots of black smoke?. 7-liter) small block V8 with a 4. What would cause 1995 Chevy blazer to run for 20 minutes, then stop and not start again? Installed new fuel pump. I got the engine timed to the 6 before TDC GM spec. Stock heads and cam. 1993 GMC/Chevy 5. Fuel injection is becoming a very popular upgrade or TBI conversion to any carburated vehicle, get that new car starting with Fuel Injection from Performance Fuel Injection Systems. Join millions of people using Oodle to find unique used cars for sale, certified pre-owned car listings, and new car classifieds. I have a 1994 Chevy S10 Blazer and after a trip i arrived back home and casually turned it off. Timing at 0 degrees BTDC in bypass,. The way it's running I don't doubt it will foul them all again this time. why can't I just get my vehicles to run right for one week? I think the oil pump crapped out in the xj, so now I'm driving the 93 chevy, heres whats going on: 1993 chevy k1500 - 5. Once it is warm, it runs good unless you try to accelerate real fast. had a 94 305 TBI which on the odd occasion would start running rough, did the same cap rotor swap still ran rough, checked codes, reset timing, finally by fluke I noticed one of the vaccum hoses came off of the egr valve (Not sure if its a valve as it was a plastic box on the passenger side of manifold next to TB), plugged it back in nice idle, same condition would happen every month or so I. New chevy 350 tbi idle rough shooting oil through valve breather hose into the throttle body Get an instant quote for your car Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing. I have a 1990 K1500 5. 7L 350, TBI, Auto, 220Kmiles Its been a great truck, for the most part it runs and drives great! but at low idle or low rpm's it missis,sputters,surges and if im just barely giving it any gas it almost wants to stall out. Problem with my 1999 Chevy Silverado 1500 5. A common cause of an engine running rough is faulty ignition timing. but after a couple of mins it straitens out and runs great however it is running rich and im only getting 8 mpg. Referred to as a "small-block" for its comparative size relative to the physically much larger Chevrolet big-block engines , the family spanned from. ZZ4 350 Base. Chevy 350s typically have problems starting in cold weather, especially with temperatures approaching freezing. The SES light was on when I bought the truck but this rough running and rich mixture thing began about three minutes after I started the truck today. but it runs great when accelerating or about 60mph and faster almost like nothing is wrong with it. Find CHEVROLET 5. Remember your street car runs on the idle circuits 95% of the time! Use the drill bits to determine the size of your stock idle channel restriction by trying to put them though the restriction on on a go/no-go basis. Usually o2 sensor issues won't foul plugs. This quick walk-through will get your Holley carb up and running with a perfect idle in no time. Vintage Air climate control. I then unplugged the IAC and the idle sped up and smoothed outplugged it back in and it went back to rough. So I have a 95 TBI 350 with about 190K miles on it. It also seems to run better when the truck is cold but once it warms up it gets worse. Check the fuel injectors for proper operation using your long screwdriver as a. When I start it, (starts every time) it takes about 3 seconds from cold start to fire up. Rough idle, the problems started in the fall when the temp droped and as it gets colder the rougher the idle is and have to give it gas just to keep it running. The plugs are new, wires, new cap and rotor are fine and dandy. 91 350 TBI rough idle and no power at all a 91 chevy C2500 with a new rebuilt 350 tbi. The colder the outside temp. Again, runs smooth at idle and even Revs smoothly but only when the truck is in park. Hold the EGR valve so the cleaning spray drips away from the electric solenoid and vacuum motor. 3 vin Z tbi motor with 135000 Miles on it. The truck has a NV3500 so the whole truck would surge. My son used to have a 90 Camero with a 350-tbi. This page is for information about GM Throttle Body Injection EFI swaps. I have a 1994 Chevy S10 Blazer and after a trip i arrived back home and casually turned it off. After a minute of racing. I have changed the idle air valve, the TPS, and the thermostat sensor without any results. This Complete Truck For Sale this is a Good old running well maintenance WT with service records that has a complete Remanufactured drivetrain the engine is a 5. Once it is warm, it runs good unless you try to accelerate real fast. 7 GSi with TBI worked on by a shop here in San Diego (I wont mention any. watch each rocker for a few cycles then move on. It idles terribly. When outside temp is below around 50 deg, the. was throwing code 33 so i replaced the map sensor with a new one. problem is that i cant seem to get the truck to idle or run correctly. The 1993 Chevrolet Silverado has 1 problems reported for engine runs rough. CarComplaints. It has an edelbrock performer package (cam/intake/carb) it has a mechanical fuel pump. It's a 1997 GMC k1500 with a 5. Engine wont idle/ Runs rough Volvo 5. it idles rough and acts like its running really rich, then when you take it out to drive it, as soon as you step on it to put a load on, it cuts out and backfires. Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. 7/350tbi) running rich within the Automotive Support forums, part of the Tech Support Forum category. You need revs. got off hwy few eeks ago engine bogged down,kept stalling,I got stuck and was able to get it moving,running very rough 11. Cleaning Throttle Bodies You slip behind the wheel for the morning commute. runs rough and feels starved for fuel when in drive and under any sort of load, barely drivable. The commando project seems to be running hotter than I expect. 0L) and LO5 (5. 1993 GMC/Chevy 5. Tore down to nothing. The truck runs fine when it is warm, but when it is cold it runs rough, rich and stalls. The problem can usually be traced to the carburetor or distributor. The 1993 Chevrolet Silverado has 1 problems reported for engine runs rough. no clue where to go now? 44: OMC Chevy 350 Rough. Greetings all. Reader Question. The ECM expects to see no voltage on the EST line during this condition. Just recently did the plugs, wires, rotor, and cap with all Delco stuff. RTH diagnosing 1990 350tbi stumble/stall when warm. i'll check the throttle cable here in a bit. Each TBI has a complete one year warranty. 1987 Chevrolet Truck rough running 350 tbi. Depending on the year, make and model of a car, horsepower ranges from approximately 145 to more than 370. Located in Upland, CA. I just replaced the plugs about 3 months back and it ran fine after, people have told me things like it is the o2 sensors to the cat is plugged up to my fuel filter is bad. I put a k&n air filter on it, complete tune-up, ran some injector cleaner through it, and a flowmaster dual exhaust. I also noticed when it's cold it runs slightly rough and the idle varys a bit. That's a long story from when my project began. Referred to as a "small-block" for its comparative size relative to the physically much larger Chevrolet big-block engines , the family spanned from. It's a 1997 GMC k1500 with a 5. Just makes them run dark. It also seems to run better when the truck is cold but once it warms up it gets worse. I have changed the idle air valve, the TPS, and the thermostat sensor without any results. If you have access to a scan tool use a hook up for a 1990 350 cu. watch each rocker for a few cycles then move on. the man that all that bought a new crate motor 7 or 8 years ago the motor that is in the truck now as got approximately 190, 000 miles truck runs really good does not smoke does not knock check engine light is not on repeat not on. I have 1992 1500 chevy truck 4x4, Its always been a good running truck, has the 4. The plugs are new, wires, new cap and rotor are fine and dandy. it turns over for a few seconds, then has a fluctuating idle until warm, once put in gear the idle speed lowers (no tach so not sure on rpms) and taking off from a stop it bogs out, stalls, sputters etc. I replaced the TBI gasket again, just to be sure. Discussion in ' Chevy Truck Talk & GM News ' started by Mowerwolf , Nov 22, 2017. 350 TBI with turbo 350 trans. truck is a project have 4speed 350 engine new edelbrock heads cam intake new electronic distributor new finned aluminum oil pan and rocker covers also new pistons polished 327 crank rods new bearings installed in engine cab still needs a bit of work new cab corners and steps installed DOSE NOT RUN center. Since 1938, Edelbrock has manufactured its core products in the USA for quality & performance. You can plan local FSC meets in the Events Planning sub-forum and then tell us how it went in the Wrap Up sub-forum located inside. 1987 Chevrolet Truck rough running 350 tbi. In this tech article HOT ROD shows you how to hop-up a Chevy 350 engine equipped with the sequential central port injection (SCPI) fuel system with a Comp Cams camshaft - Hot Rod Magazine. The commando project seems to be running hotter than I expect. Bad engine coolant temp sensor, cold running engine, or bad oxygen sensor is usually the culprit for this. 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. 71 chevy with 350 engine, edelbrock intake and 600 cfm carb setup, new HEI distributor put installed, 8mm spark plug wires. One of the most common problems is likely a rough running or poorly idling engine. took it to the dealership, who said the plugs were fine. You did the right checks as far as you could go. '91 Chevy 350 TBI surging at idle and stumbling at speed Howdy - 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. I have a 89 chevy surburban 350 tbi it has a real low chopy idle and stalls I put new plugs wires cap rotor in it I put seafoam fuel cleaner in it also its running. This is a discussion on 1990 rough running chevy truck within the Automotive Support forums, part of the Tech Support Forum category. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary,. Chevy 350 is backfiring/misfiring through the exhaust? It starts just fine but at an idle but smells like it is running way rich and when you rev to about 1700+ it starts to make popping sounds in the exhaust but stops when you bring it back to an idle. Locate the throttle cables and rotate the throttle plate. Greetings all. Follow along as HOT ROD buys the parts that matter for power and builds the cheapest small-block Chevy you can afford for only $2,613 and makes 391HP on a budget - Hot Rod Magazine. 3 vin Z tbi motor with 135000 Miles on it. watch each rocker for a few cycles then move on. i don't know what else to replace. I'm running out of ideas. Vintage Air climate control. if its the camshaft you will notice little movement on the rocker arm. I’ve had a rough idle problem with the Chevy 350 engine in the van and haven’t been able to solve the problem for over a year now. 94 chevy k1500 350 tbi: in the morning when it is cold i start my truck and it runs rough with engine shaking and sometime dies. it turns over for a few seconds, then has a fluctuating idle until warm, once put in gear the idle speed lowers (no tach so not sure on rpms) and taking off from a stop it bogs out, stalls, sputters etc. Fuel injection is becoming a very popular upgrade or TBI conversion to any carburated vehicle, get that new car starting with Fuel Injection from Performance Fuel Injection Systems. 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. The Chevrolet small-block engine is a series of V8 automobile engines used in normal production by the Chevrolet Division of General Motors between 1954 and 2003, using the same basic engine block. Chevy 350s typically have problems starting in cold weather, especially with temperatures approaching freezing. 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. If done right you’ll have a perfectly smooth idle. It then bogs and backfires 2 Answers. Code 42 - Electronic Spark Timing Circuit (EST) Circuit Description. Anyway, we have been chasing a rough idle ever since we got it. I have a 93' Chevy K5 Blazer that developed a cold start issue just recently since the temps have started hitting the 40's at night here in Eastern Washington state. 7 Vortec - Duration:. I've checked the timing and it's set at +2 degrees. Re: hard start 98 chevy vortec 454 December 11th, 2011, 12:57 AM leakie injector would do it. So the problem seems to be that something is advancing the timing way out of range on cold start for 30 to 45 seconds, then it comes back to normal and runs fine. No I don't mean harder plugs, competition coils, lumenition etc. Will not re-start, seems to be flooding at this point. 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. Its legendary status is based on an incredible performance level that is stone cold reliable. I have spent almost $1000. 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. The Chevrolet "Big Block" is a term for a series of large displacement V8 engines that have been developed and produced in the United States from the 1950s until 2009. I have a Chevy K1500 sierra with a 350 that is not EFI. So I have a 350 tbi in a 90 jimmy and it's not running and wanted to know if anyone had ideas. Reconnect the pressure regulator and then start the engine. Runs and drives excellent, never been modified or off-road, all stock and original. The engine runs fine when it's cold. 350 engine is one of the best engines created by GM. So I have an 87 Silverado half ton. It still idles weird, I'm really starting to lean towards a misfire at idle, so I need to go unplug the wires 1 by 1 and see if I get no change on one. The truck has TBI, not a carb. Reinstall the ductwork and attach the vacuum lines and electrical connectors. 1993 GMC/Chevy 5. Hot or cold the engine has to turn about 4 seconds before it starts. 7/350tbi), I just bought it from a used car lot and noticed it was running. This is the first ever symptom of a bad TPS. Original 700r4 was removed replaced with a custom transmission, built in Arizona. I have a 91 Silverado K1500 4x4, 5. com has a wealth of information RE GM TBI systems. Streetside Classics is the nation's top classic car consignment dealer. com on June 24, 2016 Earlier this year car started running rough. After about 10 minutes when the engine is warmed up and I come to a complete stop the idle tends to fluctuate. Anyone can take it for what its worth. Testing a Lean Fuel Trim. My 2002 Chevy Suburban 2500 idles very rough when starting for the first time in the morning. Big block Chevy motors range from the 425 horsepower 454 to the outrageous 720 horsepower 572 big block Chevy crate motor. I've had a rough idle problem with the Chevy 350 engine in the van and haven't been able to solve the problem for over a year now. I have a 90 Chevy 2500 , 5. 91 350 TBI rough idle and no power at all a 91 chevy C2500 with a new rebuilt 350 tbi. Just makes them run dark. On a 1991 Chevy 350 tbi if your injector wires are crossed will it still run but only with a spit and sputter? What would cause a 76 model 350 Chevy to run bad when idling. Had recently filled up and thought it might be bad gas. did not fix the problem and now throws codes 33 and 34 even after 3 different map. The Cross Fire Injection albeit as short lived as it was, was considered to be "cutting edge" when it was introduced in the fall of 1981 for the 1982 model years. 89' 1500 350 TBI rough running, any help appreciated a few weeks ago the truck started running rough when taking off When the truck is cold it hardly does it. I am having a problem with a miss in the engine. This would let air in and starve the engine of fuel under heavy loads. 7 liter 350 TBI V8 4L80E 2wd automatic this transmission is Rear wheel drive and It has less than 40000 miles since it was rebuilt this truck has 8 bolt Wheels with 19. 94 Chevy Truck surges at idle in gear, loss of power under accel? I just bought a 1994 K2500 w/ 5. The engine is covered by a GM warranty for three years or 100,000 miles in applicable GM vehicles only. 7L Chevrolet truck. You can use a late 80's or early 90's GM TBI definition. No motor oil or coolant leaks. My mom passed away back in 98 and he drove it for a little over a year and just parked it. Hey guys, Ive got a 92' S10 Blazer 2WD with the 4. Located in Upland, CA. com : Car complaints, car problems and defect information. Will run and drive, shifts good, but engine is running rough. I spec'd out the coolant temp sensor at warmer temps @ 175 and 150 and it's with in specs. Note, this was built on a Small Block 350 Chevy motor from a 76 Monte Carlo (swapped into this Nova). Now when its cold it runs really rough coughing and sputtering. But NO ONE, and this includes the Chevy dealer, could find the problem. But drop a little 110 down the carb and it would fire up and Run But Once the motor was stone cold again NO Way it fire. Find CHEVROLET 5. So the problem seems to be that something is advancing the timing way out of range on cold start for 30 to 45 seconds, then it comes back to normal and runs fine. Greetings all. It will go from very low rpm's, about 500, and start studdering as if it wants to turn off then rev it. I had the fuel pump replaced and have been using Lucas Injector Cleaner with every tank of gas. My Problem is when I fire it up in the morning it runs rough with a misfire , I notice a bit of condensation (water) out of the tail pipe. New inventory arriving daily. Post truck shows, events and gatherings here. I have a 95 Blazer that I love and runs pretty good. Chevy Silverado and GMC Sierra Stalling Problem a 350 motor. 0L) and LO5 (5. got off hwy few eeks ago engine bogged down,kept stalling,I got stuck and was able to get it moving,running very rough 11.