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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for September 18, 2013
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Open Help Requests for GM
Help Request Answers
1987 Chevrolet Celebrity 2.5L Poor Idle Quality, Stall VIN: 2G1AW51R1H
This cars MAT pid reads OPPOSITE of what its supposed to, swapped in different MAT, no change. Cant find any issues with feeds or grounds. But some where this issue has happened before. Runs old edge board 1227748 computer, swapped in salvage yard ecm, no chan...
1995 Chevrolet C2500 5.7L clutch VIN: 1GBGC24K9S
Cold clutch works fine. After running 20 to 30 minutes it won't go in gear. We added or welded 2 inches to the slave cylinder rod and no change. I discovered today that I can pump the clutch when its not releasing and it will go in gear. Please and thank you f...
2002 Chevrolet Venture LS 3.4L Poor Idle Quality VIN: 1GNDX03E52
This vehicle came in with the complaint of rough/no idle (a power braking method of getting it to drive). Customer states that highway cruising is fine. The catalytic converter has been cut out. No codes. My first thought was EGR. But this seems to not be the ...
2003 Chevrolet Tahoe LT 5.3L No Start VIN: 1GNEK13Z53
Customer had no prior issues with vehicle. Parked in his driveway for a month while out of town. Returned home to a crank but no start situation. Car was towed to my shop.Checked for fuel pressure, 58 psi. Check spark, all 8 coils have good strong spark. check...
2003 Chevrolet Impala 3.4L speedo VIN: 2G1WF52E23
the speedo is erratic and the trans hunts for gears, hesitates, etc. when accelerating normal the speedo and scanner show 9 mph and you ARE ACTUALLY GOING 40MPH. WHEN YOU DECEL IT JUMPS UP TO 40.if you drive easy then speedo op is ok. found no TSB's. googled i...
2005 GMC Envoy SLE 4.2L Mechanical VIN: 1GKDS13S05
I do feel a vibration in the engine at idle in gear. The vibration is worse with the a/c on, but still there with the a/c off. I can remove the serpentine belt and it seems the vibration is almost gone. I can stop the cooling fan while the engine is running an...
2004 Hummer H2 6.0L Check engine light VIN: 5GRGN23U14
Customer came in for Oil service with check engine light on scanned found P0300 for multiple random misfires, tried Crk re-learn. Code still came back tried a fuel flush. Check engine light went off for a while. Next time customer came in the check engine ligh...
1998 Saturn SL2 1.9L run on VIN: 1G8ZK5275W
This car has an intermintent run on problem. You can turn the key to the off position and it stays running, Doesnt happen all the time. Ive replaced the electrical ignition switch and worked fine for 2 days then acted up. I dont think the switch was related to...

Fixes & Summaries for GM
Fix/Summary Answers
2005 Buick Allure CX 3.8L Poor Idle Quality
The vehicle has not returned, posts from techs were " do a throttle body clean and a throttle relearn" "Do a crank relearn, check o2 sensor, especially keep an eye on the 02, I have seen these set erroneous codes" "I'd look into throttle body but would still c... Trouble codes: P0335, 01133 (o2 sensor code).
1995 Chevrolet S10 4.3L 4w/drive VIN: 1GCCT14Z9S
Thhanks to all that replied.Those of you that said vaccum switch on t/case hit the nail on the head.Replaced switch and returned truck to cust. 1 wk. ago and have no further problems.Thanks again Mark
1999 Chevrolet Corvette 5.7L MIL Lamp on, Temp gauge erratic VIN: 1G1YY22G4X
This one is fixed... Thanks to everyone that responded!! Tim [...] nailed it it was the G106 ground above the starter that fixed it..I also cleaned and tightened g102 on frame above horns and g104 and 108 under battery tray. As well as G105 left side of bl... Trouble codes: P0117 (ECT sensor circuit low voltage), P1114 (ECT sensor circuit intermittent low voltage).
2003 Chevrolet S10 4.3L clutch pedal VIN: 1GCCT19X43
We ordered another clutch set from a different manufacture and found that the pressure plate from the original replacement was a different height. We put a new clutch kit in and that solved the problem. Never seen this happen before but now a lesson learned to...
2007 GMC Sierra 2500 HD SLT 6.6L No Start, Stall VIN: 1GTHK23667
Thanks guys for all the help. I have fixed this truck and learned a lot about this engine. I installed a clear line like many of you stated and saw that I was in fact pulling some bubbles through it. Not much, but eventually enough to make the truck stall o... Trouble codes: P2510.
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