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Prev Professional Automotive Repair Technical Discussions for December 17, 2010
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Open Help Requests for GM
Help Request Answers
1984 Chevrolet Corvette 5.7L fuel leak VIN: 1G1AY0781E
My personal car, was spraying a bit funny on rear (drivers side) injector... Took upper plate off rear throttle body to access injector etc... At that point found that gasket for upper plate on throttle body had torn on dissassembly... I work all day on German...
2001 Chevrolet Silverado 2500 HD 6.0L engine VIN: 1GCHK29U01
Customer plows with this vehicle. Overheats when plowing only! When driving around with the plow on, no problem. When pushing snow runs hot and will boil over if you don't stop. Boss plow has been on since new has had now problem until the last plow of last sp...
2006 Chevrolet Silverado 1500 Hybrid 5.3L Starting VIN: 1GCEK19T16
this truck came in for lifter noise. we found 10 out of 16 bad so we replaced all. reassembled engine, filled fluids, started and backed out of shop. we ran @ 2000 rpm for a few minutes, then let idle. we shut off the engine and checked fluids. (all were ok) w...
2007 Chevrolet Silverado 1500 HD Classic LT 6.0L Poor Idle Quality, Surge VIN: 1GCHK23K77
Greetings All, We have no history on this truck other than the current problem. It came in for lack of power complaint and SES light. Scanned with Tech2 and found multiple inactive codes:P2119- throttle closed pos perf, P2770- 02S2 stuck lean, P1516- TAC modul... Trouble codes: P0507 (Idle Speed High)
2008 Chevrolet C4500 Kodiak C4E042 6.6L Exhaust pipe VIN: 1GBE4V1918
We have a fleet of Chevrolet 4500s. They all routinely develop an exhaust leak on the down pipe leaving the right side exhaust manifold. The exhaust down pipe develops a crack around the sealing flange bend. We have tried cutting and adding a flex joint close ...
2004 GMC Savana 3500 6.0L cluster VIN: 1GDJG31U14
hello,and thanks for reading.i know these clusters are infamous-we have replaced plenty of them in the past. this one came in inoperative(except the ck eng light would sometimes illuminate koeo) checked w/scanner,all modules communicate except icp.bcm has code...
2001 Pontiac Grand Am SE 2.4L Passlock Ststem VIN: 1G2NF12T41
this car at times 3 months or so will not start- passlock system fault. never any codes. when we turn key on and passlock starts flashing- leave key in on position and car will always start after short period. 10 to 15 minutes for us but customer always has to...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick Park Avenue 3.8L Low coolant light VIN: 1G4CW52L5R
Good day and thank you for your replies. This particular system uses a oil level module, coolant level sensor, oil level sensor, power source and lights on dash panel. This low coolant sensor is mounted in the right tank of the radiator. When the coolant lev...
1998 Buick Park Avenue 3.8L mode doors
This one is fixed and out the door. I had several replies that this is a vacuum operated system but is not. It is all electronic controled. The mode control motor is located on the drivers side of the HVAC housing (there are four total motors) I was able to co...
1989 Cadillac DeVille 4.5L fuel and a/c data VIN: 1G6CD1157K
ordered and replaced the BCM after verifying there was no short to ground or battery voltage at the connector. once the BCM was replaced the fuel DIC & A/C control has operated correctly. Thanks to all who helped. the fix was posted in the Knowledge Base secti...
1995 Chevrolet Lumina LS 3.1L vats module VIN: 2G1WL52M0S
Thanks to everyone who responded. Got some good information about an aftermarket frequency generator that can be used to substitute the signal from the theft deterent module to the ecu, but in the end my tech did what I told him he should do all along, and sim...
1998 Chevrolet Blazer 4.3L abs VIN: 1GNDT13W5W
found the rf hub was out of spec replaced rf hub brakes working ok now .do not use cheep after market parts.
2001 Chevrolet Impala 3.8L no dim lights VIN: 2G1W55K319
thank you all for your help once I understood how the system operated started searching found acid dripped into harness from battery 4 inches of 15 wires were corroded replace fuse block and light harness problem solved thanks again Joe
2003 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Surge VIN: 1GCEK19T93
When I replaced the intake gaskets, I checked the intake for warping or cracks. I also replaced the injector O-ring seals as I do with every intake job. Both throttle bodies (old and new) were cleaned and tried with no better results. I went to see a know... Trouble codes: P0300 (Random Misfire).
2004 Chevrolet Impala 3.8L heater fan VIN: 2G1WH52K04
well i have never had a blower motor do this in 35 years.the blower never stopped it just fluctuated up and down.i replaced it and gave it to the owner and checked with them again today and tehey say it is all good.thanks for the input
2006 GMC Sierra 2500 HD SLT 6.6L Electronic VIN: 1GTHK23D46
I am closing this post because we have been soooo busy in the shop I haven't had any further time to even look at it since it's my own truck...I'm sure you all know how that goes. Trust me, in this economy, I ain't complaining! I am still laughing at Dennis' p...
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