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Prev Professional Automotive Repair Technical Discussions for September 10, 2008
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Open Help Requests for GM
Help Request Answers
1996 Buick Skylark Limited 2.4L Hesitation, Surge VIN: 1G4NJ52T6T
this buick has a bad hesitation at cold start. comes in just about when sys. goes into closed loop at normal acceleration. will overcome sag at wot.came to my shop with history from previous owner. turns out just about everything under the hood has been replac...
2000 Buick LeSabre Custom 3.8L door locks,lights,radio,power windows,airbag light VIN: 1G4HR54KIY
Vehicle came in and intermittently the radio,power locks,power windows would not work. The security light and airbag light would come on. When problem occured lost all communication with modules. Found data line was going down. Started removing modules when pr...
2004 Buick Rainier CXL 4.2L engine VIN: 5GADT13S84
Hello all, Working on a 2004 Buick Ranier-came in a week ago with a slight engine knock. The customer needed to take the car, so they drove it two days and brought it back to be diagnosed, the knock was more apparent after being driven. The knock is louder un...
1989 Chevrolet Corvette 5.7L No Start, Poor Idle Quality VIN: 1G1YY3181K
Good afternoon everyone I have an 89 corvette that was brought to me through a referral from a regular customer. I dont usually work on american cars but I thought I would try and help. The customer said that the car runs good when first started cold and then ...
1991 Chevrolet Camaro RS 5.0L Stall VIN: 1G1FP23E1M
engine shuts off at approx 5to 10mph(note: speedo is regestering over 10mph per 1 mph so at approx 5mph or so the speedo goes over 110mph and i believe the overspeed is shutting off ign.) is there a adapter somewhere that corrects the pulse ratio from trans? i...
1993 Chevrolet C1500 Cheyenne 4.3L Stall VIN: 1GCEC14Z9P
Truck would not accellerate without popping and falling on its face, Found the distributer reluctor ring cracked and throttle body gasket cracked, Replaced those but now the truck when started cold will die when it does start to idle it will die when you put i...
1996 Chevrolet K1500 Cheyenne 5.0L master cylinder VIN: 1GCEK19M8T
Vehicle came in with a sinking pedal. I checked for any lks and none found. It seem to me like the fluid was bypassing the cup seals. So I replaced the master with a reman unit because thats what he could afford at the time. I bench bled it and all seemed good...
1997 Chevrolet Blazer 4.3L Connector VIN: 1GNDT13W5V
I cannot get the 8 pin connector on the side of the 4L60e neutral safety switch/range selector switch to release. Tried every trick I know - spent an hour and it still wont release. Finally got the 4 pin connector to release. Help me pleeeeese. The replacement...
1998 Chevrolet S10 2.2L Misfire VIN: 1GCCS1446V
customer states she was on expressway and got off because of lack of we pulled the cat firguring it was plugged but its not, when u drive it it falls on its face and has multiple misfires...tried, module, coils, fuel injection cleaning...someone ple...
2000 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 1GCEK19TXY
please help, this truck was purchased used and has had this problem since day one. if i put my scanner on it and turn the key on the two front o2s read 447 mv and the two a fter the catalytic converters read b1s2 440 mv b2s2 430 mv. then start it up and the fr... Trouble codes: P0137, P0157
2000 Chevrolet Silverado 1500 5.3L No Start, MIL Lamp on VIN: 1GTEK14T1Y
Well Ive been doing this for over 30 years and today may be the day I got in over my head. This truck belongs to my brother so thats even worse. Heres the issue. Truck came in with tranny locked in default mode with ses light on. Had the codes listed above. Th... Trouble codes: P0463, P0758, U1026, U1041
2001 Chevrolet Silverado 1500 HD LS 6.0L battery VIN: 1GCGC13U81
I am posting for a fellow tech at this shop. This vehicle has a battery draw. He has replaced the battery and the alternator but to no avail. He took the truck to a GM dealership. They had the truck for 3 weeks and said (guessing) the headlight switch and/or m...
2002 Chevrolet Impala LS 3.8L ABS Module VIN: 2G1WH55KX2
Hi again fellow techs. We have this Malibu with abs light and pump activation intermittantly under 10 mph. Trac off light comes on also. Right now it is doing it consistantly. It is showing C1226 RF whl spd sensor erratic. We have replaced wheel bearing hub th...
2004 Chevrolet Aveo 1.6L MIL Lamp on VIN: KL1TD526X4
Chronic CEL light issue. New OE gas cap. Smoked without positive results. Are there any chronic issues with evap valve, solenoid, etc? Any help would be greatly appreciated!! This is my daughters car. Trouble codes: P0455 (Evap system large leak detected)
2006 Chevrolet Malibu Maxx LT 3.5L Remote programming VIN: 1G1ZT618X6
I have a customer that purchased a new remote for their car. I am a greenhorn just learning J2534 programming. I have a cardaq plus J2534 programmer. Can I program the remote to work with this car. I have not purchased the gm J2534 subsciption but I am plannin...
2002 GMC Yukon SLE 5.3L MIL Lamp on VIN: 1GKEC13Z82
Not much I can offer on this one. It is a hard code which sets only with engine running as designeda according to the circuit description. The description states the code will not turn the light on, but the light is on either as a result or some unknown issue.... Trouble codes: P0650
2005 GMC Envoy SLE 4.2L MIL Lamp on VIN: 1GKDT13S05
thanks in advance to all who help. vehicle came in this morning with the check engine light on. hooked up scan tool, found [...]: system lean bank 1. monitored data stream. STFT:29. LTFT:19. MAP:30. HO2S1:.045v. spec calls for HO2S1 to be 200-800mv. i am le... Trouble codes: P0171
2004 Saturn Ion-2 2.2L MIL Lamp on VIN: 1G8AN12F34
P0442 small leak detected,replaced off brand gas cap that had a small leak. Two days and three cold starts and the light is still on. Smoked it and found no leaks. The flow meter shows no flow with the vent solonoid comanded off. The fuel pres. sensor apears t... Trouble codes: P0442 (evap small leak detected)

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Roadmaster Limited 5.7L compressor clutch VIN: 1G4BT5377N
The A/C works now which is all the customer wants at this point. We accomplished this by splicing the two wires together on the P.S. pressure sensor circuit. This tells the computer that the pressure is low enough to allow A/C operation and thus engages the cl...
1997 Buick Regal LS 3.8L Misfire VIN: 2G4WB52K5V
thanks for all the replies i checked out the crank sensor and seen that it had a little bit of oil on it so i deceided to change it and now the mis-fire is gone thanks again for all your help!! Trouble codes: P0300.
1999 Buick Regal LS 3.8L steering system VIN: 2G4WB52K7X
Once again IATN has saved the day.Thanks so much for all the great replies!Most of them "steered" ;) us in the direction of the tires,and that is what it turned out to be.Rotating the tires did the trick,no more pulsation.We had already recommended to the cust...
1996 Cadillac Seville STS 4.6L Electrical VIN: 1G6KY5292T
thanks to all those who posted suggestions. This is one of those cases that you are really not sure what fixed the problem. As one of the techs suggested I cleaned all the grounds under the drivers seat and pulled apart and cleaned connections in the fuse box....
1997 Chevrolet Monte Carlo Z34 3.4L Oil drive O ring VIN: 1GERTYUI34
Thankyou all for that splendid advice, we shall pull the oil drive up an inch or two and shoot it up with red silicone sealer.
2003 Chevrolet Silverado 1500 5.3L rear leaf springs VIN: 2GCEK19T43
I have seen the service bulletin, I had previously checked the torque on the u-bolts. I had previously looked for contact between the leafs. The vehicle would make the noise by just a very slight bounce of the body, vehicle not in motion. I could feel the roug...
2004 Chevrolet Trailblazer EXT LT 4.2L oil gauge and speedometer VIN: 1GNET16S84
Well it ended up being 2 problems. I replaced the cluster and the speedometer problem is fixed but not the oil pressure gauge. I then had to replace the oil switch above the oil filter to correct the erratic oil pressure reading. All is well now. Thanks
2004 Chevrolet Tahoe LS 5.3L transfer case VIN: 1GNEK13Z54
just put new transfer case in , thanks for the help . i did remove front drive shaft and it instantly got easier to turn , so i flushed the case again with fluid and drove several times with no improvement . we put a rebuilt t case in today and filled with aut...
2006 Chevrolet Cobalt SS 2.0L Excessive Emissions, Misfire, MIL Lamp on VIN: 1G1AP14P56
the repair was 2 fold ,1st was injector were the wrong injectors for the pulley that was on the supercharger and also the software had not been upgraded,you have to purchase an upgrade kit from GM it comes with a pulley ,injectors and software upgrade.(had to ... Trouble codes: P0172 (fuel trim rich b1).
1995 Geo Tracker LSi 1.6L Mechanical VIN: S3TA02C6S6
It's fixed but not sure why. I checked the oil pressure, normal. I checked for end play, normal. I checked PCV system and all related hoses, normal. Oil cannot get to the crank bolt on this one, and there is no slinger to do with the timing belt. The seal was ...
2000 GMC Savana 3500 5.7L abs VIN: 1GJHG39R6Y
Thanks guys, I got this one beat. Tire size and missmatch were not the issue, even though the tires were crappy. When I hooked up the scanner it would read with the speedometer, and just sitting on the hoist idling in drive with rear wheels turning, the speedo... Trouble codes: C0238.
2004 GMC Sierra 2500 HD 6.0L abs VIN: 1GTHK29U54
Two EBCM had same code and symptoms. They were used. Third EBCM solved the problem which was also used. Thanks for the replies.
2004 GMC Yukon Denali XL 6.0L oil pressure` VIN: IGKFK66U44
we finally figured it out. the problem was in the fuel pressure regulator/return line. we discovered when you released the test post on the fuel line it would start up as normal. we attached a fuel pressure tester and then test drove it. once returning i...
1999 Oldsmobile Alero GL 2.4L Alternator
Thank you to the four who replied it ended up being the alternator as I had thought. Thank you for you help. I had to go trough the shop that originaly replaced the alternator so i wanted to be sure it was that problem. Thank, Scott
2001 International 4000 4700LPX 7.3L speedo VIN: 1HTSCABM51
1994 Pontiac Firebird Formula 5.7L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 2G2FV22P1R
well first of all let me thank everyone that took the time to help on this... i had a patient customer so i did no touch the car for two days( hence he long response time)... i took the advice from several of you and started to remove fuel rail to change one p...
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