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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for June 24, 2004
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Open Help Requests for GM
Help Request Answers
1991 Chevrolet Astro CL 4.3L long crank VIN: 1GNDM19Z3M
the ecm is slow to energize the fuel pump relay at times. checked powers and grounds and inputs from the ignition switch. sometimes it takes over five seconds of cranking before the fuel pump relay is energized. i watched the input on a graphing meter and as s...
1995 Chevrolet C2500 7.4L Poor Idle Quality, Hesitation, Stall VIN: 1GCGC29N35
this truck is driving me nuts!! 3 other garages and 1 dealership have looked at this rig before it got to my shop. the truck runs very lean despite having plenty of fuel pressure and good volume.the ecm is seeing the problem and is responding with block learn ...
1996 Chevrolet Monte Carlo LS 3.1L poor power VIN: 2G1WW12M3T
car came from another shop,he replaced t.p.sensor for poor power concern on light accell,scanned car no codes,road test,car will loose power on light accell at times,checked fuel pressure ok,cleaned injectors with motorvac system,still the same,we have tried a...
1996 Chevrolet K1500 5.7L ac VIN: 2GTEK19R3T
AC not blowing cold. Checked refrigerant type and for contamination, 100% R134a. Recovered, evacuated and recharged system with proper charge, still same result (see above pressures). Sprayed condenser with water, pressures came into proper range and outlet te...
1999 Chevrolet Camaro Z28 5.7L electric windows/door locks VIN: 2G1FP22G0X
Electric Window's won't operate Up/Down,Also Power Door lock's only operate to open,Tryed to retrieve BCM code's going thru trouble tree,Will not flash any codes,"Security" light doesn't come on at all (during test),Disconnect c2 connector at BCM, Red wire hot...
1999 Chevrolet Silverado 1500 5.3L Misfire VIN: 1GCEK19T4X
Hello techs. This truck came to me this afternoon and i had a little time to mess with it. Complaint was that mil is on and runs very rough. Sure enough as soon as it started it was missing very badly. Also had multiple cylinder missfire code. So i looked at t...
1992 Oldsmobile Cutlass Cruiser S 3.3L Excessive Emissions VIN: 1G3AL54N1N
This car will not pass Virginia state emmissions test. NOx is very high. Other readings are very low. I am led to believe that the engine is running lean but I don't know why. The "service engine soon" lamp comes on about one time during driving for any period... Trouble codes: 26 (quad driver control malfunction)
2000 Oldsmobile Alero GLS 3.4L Unknown VIN: 1G3NF52E0Y
Popping noise when turning-you have to be moving-sounds like cracked frame-vary random and intermittent. Installed chassis ears and drove the vehicle until vehicle drove me crazy! Possibly the lower control arm-right. When popping noise happens it's quite pron...
1989 Pontiac Firebird Trans Am 5.7L long cranking time VIN: 1G2FW2189K
Hello Techs, I have a 1989 Pontiac GTA 5.7l that came in with a cold start up problem. The customer had it some where else and this guy threw all kinds of parts at it. The car cranks and cranks when its cold and finally will start after much cranking. After t...
1997 Saturn SL1 1.9L low brake pedal VIN: 1G8ZG5288V
Hey guys, this is my first time so here goes. This Saturn came in for other problems and upon a test drive I noticed the brake pedal goes to the floor to stop the car. The customer ok's a diagnosis. I ckecked the adjustment of the rear brakes...good, no leaks ...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Park Avenue Ultra 3.8L Supercharger idle pulley VIN: 1G4CU5211V
I never got the body mount out of the car-but was able to pry mount far enough out of the way to access idler pulley.I believe the engine would have to be jacked up for the lower mount to come out-however the engine mount bracket vertical studs prevented that....
2002 Buick Rendezvous CX 3.4L suspension? VIN: 3G5DA03E42
The customer came back again & it was really apparent that the problem was in the front wheel bearing/hub. Some of the responses mentioned the fact that only the OEM bearing/hub should be used. I intend to follow those cautions. My only question in that regard...
1976 Cadillac Eldorado 8.2L Poor Idle Quality, Hesitation VIN: 6L67560224
i have not gotten this vehicle back for further testing. when i get the vehicle back in i'll run the tests and repost the results of all your efforts. thanks to all who responded.
1999 Cadillac Catera 3.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: W06VR52R4X
Good morning all, thanks, everyone for the info, but none of it panned out. The customer does not want to continue with repairs (wholesale car dealer) so we shipped it as is, if I get any more info I'll post it. Thanks again, Brian Trouble codes: P0300, P0304, P0305, P0301, P0306, P0302.
1996 Chevrolet Caprice Classic 5.7L hard start VIN: 1G1BL52P3T
This vehicle has been pushed to the back of the line as buses are being serviced first...I was kind of an outside 'advisor' on this one. Based on information sent by seven members, the fix is most likely related to the crank sensor...I ran the guys off the ste...
1996 Chevrolet K3500 Cheyenne 6.5L Poor Fuel Economy, MIL Lamp on VIN: 1GCHK39F1T
thanks to the one that replied the scanner was no help checked the vac harness was ok. testing the soleniod it was bad . replaced and everything works fine now Trouble codes: P0236 (boost sensor).
1997 Chevrolet S10 2.2L fuel gauge VIN: 1GCCS1445V
Good evening Techs, Got 6 great replies saying to replace fuel sender, ground the purple wire and watch the gauge, replace instrument cluster. Tony from North Carolina had the same problem with a C1500 and found the module under the passenger side of the dash....
1997 Chevrolet C2500 Suburban 7.4L interior lighting VIN: 1GKGK26J6V
i recived many good responses. The problem ended up being the contact on the rear swing out doors. It seems that moving the steering wheel caused just enough body flex to make the lights flicker. This one sure had me fooled in there being a wiring problem in t...
1999 Chevrolet Astro 4.3L Unknown VIN: 1GCDM19W9X
almost all who replied said valve body update was the fix, apparently the tcc valve wears the bore out in the valve body. some even suggested aftermarket valvebody repair kits. my customer decided to replace the complete transmission, guess you can afford to d...
2000 Chevrolet Malibu 3.1L Hesitation VIN: IG1ND52J5Y
Thanks to Tom [...], B52OB, you 3 hit it. Replaced the 'Mass Air Flow Sensor' fixed this malibu. Thanks to everyone.
2004 Chevrolet ASTRO 4.3L Drive line VIN: 1GNDM19X64
Most of the noise was the Shift cable on the body, however the muffler also has some baffle noise that adds to the sound. Going to find a reputable Chevy dealer with real trained GM certified technicians that were not oil changers at wallyworld last week and l...
1999 GMC Yukon Denali 5.7L abs VIN: 1GKEK13R1X
thanks for all whom took time to read and respond! i had many who suggested to remove and clean rust from speed sensors. i did so but did not find any traces of debris. after reinstalling, the problem was still present. we should have scoped sensors first but ...
2001 GMC Sierra 2500 SL 6.0L abs VIN: 1GTFC29U0Y
Yep found the dirt and rust buildup as many had suggested!! Clened up and replaced one sensor on the RF whell and all is OK! Thanks again for the heads up...have not seen this before to cause this particular problem. Thanks again!!
1995 Oldsmobile Aurora 4.0L raw fuel in exhaust VIN: 1G3GR62C4S
Sorry for not posting fix right away. I never could get the problem to occur again. The ecm had to be holding an injector open because the fuel pressure never dropped with the key on engine off. If something were electrically shorted it would have caused the f... Trouble codes: 119 (injector open or short).
1995 Oldsmobile 88 Royale 3.8L blower and compressor operation VIN: 1G3HN52KXS
Ok I got some good ansures first problem yes first was a burned brown wire at a conector above gas peddle next now that I had power still no ac clutch operation. had a open high presure switch on compresor that should have gotten it right NO! then I had power ...
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