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Professional Automotive Repair Technical Discussions for March 19, 2003 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 1988 Buick Century Limited 3.8L Poor Idle Quality, Stall VIN: 1G4AL5132J This car came in with a complaint of an erratic idle when cold and stalling at times when warmed-up. We found the MAF sensor connector wire broken and repaired plus replaced the MAF sensor with a reman unit. Symtoms continued. Checked MAF pattern & voltage dro... Trouble codes: 44 (lean exhaust) |
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| 1989 Buick Regal Custom 2.8L speedometer VIN: 2G4WB14W1K The speedometer is reading inaccurately in this vehicle. It reads 45 when the actual speed is 60, at 50mph the actual speed is 69. The mph reading on the Tech 1 is exactly the same. Can anyone tell me what actually calibrates this speedometer? It looks like th... |
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| 1990 Buick Regal 3.8L Excessive Emissions, Poor Idle Quality, Surge, Misfire VIN: 2G4WD11L4L Hello group, This Regal intermittently runs poorly in the form of overfueling, missing and surging. It had several codes listed (see above) and after about a minute the scan tool will lock up. I have tried the scan tool on other vehicles and it works fine but... Trouble codes: 66 (A/C Freon low), 21 (TPS ckt high), 13 (o2 sensor ckt open/short/bad), 39 (TCC malfunction) |
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| 1997 Buick LeSabre Custom 3.8L Cuts out VIN: 1G4HP52KXV this car came in with an intermitent stalling when trying to start, customer says sometimes when going to start car, does'nt matter hot or cold engine, the engine will start for two or three seconds then shut off as if he turned the key off, and will do this s... Trouble codes: P1626 (theft deterent system-feul enable circuit), P1629 (VTD cranking signal) |
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| 2000 Buick LeSabre Limited 3.8L security VIN: 1G4HR54K4Y Hello fellow techs, I have a problem with this Buick. Yesterday this vehicle came into my shop on the hook. It was a no start. Tested battery and it only had 2.2 volts at the battery. Replace battery with one from GM (battery located under back seat along with... |
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| 1988 Cadillac Allante 4.1L dashboard VIN: 1G6UR317XJ Hi all fellow techs.I got this car from another shop ,says dash goes out intermittently.While making some tests on central power supply unit the dash ,center console ,and brake lights went out for about 10 seconds and came back on.I checked fuse #8 which feeds... |
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| 1990 Chevrolet Motor Home 454CID MIL Lamp on VIN: IGBKP37NOL Unit came in as no start what I've got is a check engine light that flashes rapidly with key on and run positions. The unit will start and run okay. This unit is built on a GM P30 chassis and uses GM electronics. I've checked all powers and grounds and found a... Trouble codes: 51 (faulty ecm faulty prom cal) |
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| 1991 Chevrolet Corvette ZR-1 5.7L Hesitation, Misfire, VIN: 1G1YZ23J4M There is a loud backfire through exhaust system when engine is decelerating but only while engine is in the warm up phase. |
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| 1991 Chevrolet Corvette 5.7L Excessive Emissions, Poor Idle Quality, Surge, Poor Fuel Economy VIN: 1G1YY3385M Hello fellow techs, This corvette runs incredibly rich, have changed oil twice and cleaned plugs twice, new O2 & MAP sensors, fuel pressure regulator OK,EGR OK. No codes are stored in computer. We have replaced fuel filter and fuel pump twice (we thought maybe... |
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| 1992 Chevrolet S10 Blazer 4.3L No Start VIN: 1GKDT13W3N This one has me going in circles.The engine ran when cold, then would run poor under load then quit.Fuel pressure is 60 psi. I have spark at the plugs when cranking the engine. The scan tool shows tps at .45v coolant temp at 50F, but I get no rpm's or injector... |
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| 1995 Chevrolet Blazer 4.3L valve/spark plug cyl #6 VIN: 1GNDT13W1S This Blazer came in for running rough. Found #6 to be a dead cyl. Pulled spark plug,was blown apart missing electrode, does not look like it was hit with anything. Compression was low. Pulled valve cover turned engine till valves were closed,put air to cyl, ca... |
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| 1996 Chevrolet S10 LS 2.2L No Start, Cuts out VIN: 1GCCS1941T The owner of this truck states he has had trouble starting this truck for the past year. It will crank over fine but won't catch. He says that while cranking the dash lights go crazy and the spedo will peg. Sometimes it will quit while driving. He things it te... |
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| 1997 Chevrolet K1500 Suburban 5.7L rear brake update VIN: 3GNFK16R2V this truck has excessive and premature front pad wear. there is a tsb regarding replacing rear shoes & proportioning valve. please help clarify some tsb confusion. in mtod, tsb86-50-20 dated april 1998 says to replace rear shoes with part #[...] dura stop s... |
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| 1998 Chevrolet Cavalier LS 2.2L DRL, High Beams VIN: 1G1JF5249W Tuesday - Customer said high beams did not work. Verified that, plus observed that daytime running lights inoperative and no DRL indicator on instrument panel. Connected Tech2 and can activate DRL's with Tech2, cannot activate high beams. When dimmer switch is... |
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| 1990 Geo Prizm GSi 1.6L no power intermintly VIN: 1Y1SL5453L Hi All Thanks for taking a moment to look at this post. Picked up this vechicle for my daughter, blown head and all. Any way this car runs great when warm and when you first start( up when it is cold. Problem occures about a mile after you start cold. You sto... |
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| 1996 Geo Tracker 1.6L tcc solenoid VIN: 2CNBJ1862T customer came to us at 97k miles tcc sol. open. he stated that it has gone out about every 20k miles since new. checked everything in circuits and found nothing abnormal replaced solenoid and all is well,back now with no tcc. was wondering if anyone knows if t... |
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| 1994 Oldsmobile Silhouette 3.8L Cuts out VIN: 1GHDU06L4R Hello to all, This Silouhette has an intermittent stall or cut out. It has died once or twice (but always restarts) and will happen at slow or hiway speeds. No codes are set and I am hoping someoone has seen this. I have monitored it while driving with the Sn... |
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| 1995 Oldsmobile Cutlass Ciera 3.1L ride control VIN: 1G3AJ85M5S Vehicle came into shop for a simple wobble in suspension/driveline at slow speeds from about 5mph to about 25mph such as what an out of round tire would make. We started with a basic inspection of driveline, suspension and wheel components. Suspected poor qual... |
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| 1986 Pontiac Sunbird GT 1.8L Hesitation, Cuts out VIN: 1G2JU7708G This car consistantly acts up. Feels like fuel but all fuel tests check okay. Going uphill it will all of a sudden buck and fart like it is running out of fuel but we never lose pressure on our gauge. It never actually quits ( for us but has for customer), but... |
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| 1992 Pontiac Trans Sport 3.1L injector duty cycle VIN: 1GMDU06D0N injectors will not work during crank cycle, Injectors operate in run position only. Will not run unless primed |
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| 1993 Pontiac Grand Prix SE 3.1L Stall Customer complaint is that after engine fully warmed up and driven awhile, it would intermittently stall when slowing down to a stop or waiting at a stop. On the test drive, the vehicle did stall once at a stop and immediately restarts. Performance is normal f... |
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| 1997 Pontiac Trans Sport 3.4L MIL Lamp on VIN: 1GMDXO6EXV Hi All i hope someone can help with this one. I did an intake manifold gasket on this car and the egr stays open .replaced egr and same thing koeo egr 0% koer egr 20% run car with egr unbolted and egr 0 % did not put a back pressure gauage on it but does not f... Trouble codes: 1406 (egr pintel) |
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| 1998 Pontiac Trans Sport 3.4L rear brakes VIN: XG1H100026 hey everyone. sorry about the bogus vin. got this 98 transport with abs and brake light on. codeis rear channel will not move. went through test and led to hcu. test was kind of different just wondering if anyone has run into this before. the pedal feels prett... |
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| 1998 Pontiac Trans Sport Montana 3.4L MIL Lamp on VIN: 1GMDX03E5W Hello group, I am hoping some of you all have run into something like this before. I pre-apologize for long post but I need to include all information. Van came in with SES light on complaint. Scan and get p0172, fuel trim rich. Monitor data and find short te... Trouble codes: P0172 |
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| 1998 Pontiac Trans Sport 3.4L Right Front wheel speed sensor VIN: 1GMDXO3E2W Hello, I hope you guys can help me out. ABS light on,codes 1226 and 1233 set. Using the manual and a dvom to test the wiring and sensor everthing tests ok. All connections are good.These codes will set anytime, it does not matter if it is wet,cold,or whatever.... |
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| 1997 Saturn SC2 1.9L No Start, Stall, stalls ,wont restart VIN: 1G8ZG1275V I think pcm is no good on this sc,but problem is intermittent,after sitting for awhile will start and run fine,then looses everything.Any help would be appreciated. |
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| 1998 Saturn SL2 1.9L engine compression VIN: 1G8ZJ5274W vehicle was towed in for no start. customer stated that he parkd vehicle night before, all was well. next morn, engine cranked, no start. first time we cranked it, sounded like no comp. after several attempts, engine started to hit on one then more cyls. sudde... |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 1999 Buick Regal LS 3.8L Whining noise VIN: 2G4WB52K1X We got 17 replies on this one. Several were close; the last reply was brief and to the point but it sure put us on the path. It was from 'Philip from New Hampshire' and said, ' Sounds like a drive sprocket support bearing noise. Probably also has a stretched d... |
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| 1991 Cadillac Fleetwood d'Elegance 4.9L Poor Idle Quality VIN: 1G6CG53B8M Thanks to all who responded about ground problems and other idle control issues. I checked and cleaned the grounds and readjusted the TPS and performed idle learn procedure and the car seems to be working alot better although why they need to race to such a hi... Trouble codes: E55 (tps error). |
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| 1988 Chevrolet V30 Cheyenne 5.7L ecm Replaced fuel sender relay & fixed some wire on harness to fuel injectors |
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| 1990 Chevrolet Caprice 5.0L speedometer VIN: 1G1BB87H8L Many thanks to trans techs out there. an Old dog like me scracthes the surface sometimes we fall thru it always good no matter how much you think you know to tweak someone else the fix was a differnt driven gear which parts availabilty was the major issue. t... |
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| 1990 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC54G4L It's fixed, did not get many replies, so I started back at the begining. It turns out that my OTC monotor 4000E was in error giving me no data. I connected my Genisys and had data stream. Then found no RPM reading. Tested and replaced crank sensor, which broke... Trouble codes: 255 (unknown fault). |
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| 1995 Chevrolet Blazer 4.3L No Start, Surge VIN: 1GNDT13WXS frist i would like to thank all four gentalmen that help you all were right my part store send use the wrong fuelpump they send one for the .Z. engine i had W.engine that explaines white smoke as for the distributorwhen setting engine to d.t.c i pull the distr... |
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| 1998 Chevrolet Venture 3.4L Hesitation, Surge, Cuts out, Stall VIN: 1GNDX03E2W thereplies that i recieved ranged from trans tcc problems to dirty injectors to egr problems. i hooked up an analog tach and found out that when it hesitated or quit my tach would drop to 0 rpm very quickly. i concentrated on ign sys. according to all the code... |
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| 1999 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W7X well thanks for the ideas. turns out to be a simple deal. found coil wire shorting out intermitttently. must have got lucky and moved it just right when testing. after tore plenum off and checked regulator, noticed on startup that the wire was shorting. but th... |
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| 1999 Chevrolet Cavalier Z24 2.4L radio VIN: 1G1JF12T8X to keep this very simple the vehicle is fixed. i received the wrong security code from the local dealer for reasons yet unknown. i called the dealer three separate times and they in turn called delphi. all three times they insisted the code was 0784, which con... |
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| 1995 GMC Sonoma SLE 4.3L Stall VIN: 1GTCS19Z4S i did not recieve any useful information,but i drove to his lot when it acted up. the vehicle immediatly died when put into gear-quickly i shoved in park or nuetral & it idled o/k. done that several times-it acted just like a torque convertor problem-i mean it... |
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| 1996 Oldsmobile Aurora 4.0L Electronic VIN: 1G3GR62C4T We checked all of the vehicle speed sensors as 2 members suggested - all checked ok for ohms and pattern on lab scope. We checked the connector on the abs module as 1 member suggested. Found that when driven with the scan tool the PVM would go into a fault whi... |
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| 1993 Pontiac Grand Prix SE 3.1L Hesitation, Surge, Cuts out, Stall VIN: 1G2WJ14T1P Hello all, Thank you for your timely responses. After reading the replies I attempted to pull codes that may have been 'dormant' even though the check engine light was not on. Well guess what I got code 35 IAC problem. David from michigan had a similar problem... |
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| 1997 Saturn SL1 1.9L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G8ZH5284V Thanks for all the responses. The least advasive repair was to load through the intake,on hot engine, running, a carbon cutter, and let set for 1 hour. We then started and ran in low gear at 3000 RPM for about 5 minutes. Now when return to idle all is well. We... Trouble codes: P0303 (cylinder 3 missfire). |
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