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Prev Professional Automotive Repair Technical Discussions for September 4, 2014
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Open Help Requests for GM
Help Request Answers
1957 Chevrolet Bel Air 4.6L Differential
I am looking for information on how to rebuild and set up the rear end in this car. It has the factory housing in it. Another shop installed 3.73 gears in it with out setting it up properly. It howls bad and cruises at 3,300 RPM @65mph customer is not happy. I...
2008 Chevrolet Uplander LS 3.9L Cooling System VIN: 1GNDV23W68
customer comes for an heating problem. No heat at idle, but heating properly when rising rpm. But on the road, temperature stays good in the cluster. was missing little of coolant. Topped up, but surprise, air always comes on quickly. Boom! I badly burned my a...
2008 Chevrolet Impala LS 3.5L No Start VIN: 2G1WB58K18
no start, no crank, no comm, pins 6 and 14 voltages 0v and .7 volts so we have a network issue. ohm out 6 and 14 from dlc we get 78 ohms. unplug bcm and get 120 ohms. This car has onstar. ohm out both sides of high speed network from bcm unplugged and read 120...
2005 GMC Envoy SLE 4.2L . VIN: 1GKDS13S45
this one is something I have never seen before.This truck came in running rough no power,codes p0305 cylinder 5 misfire detected,and p0014 exhaust camshaft position system performance. performed a compression test cylinder #5 reads 5 I removed the va...
2008 Saturn Vue XE 3.5L A.C. cycling VIN: 3GSDL43N88
We replaced the compressor, condenser & expansion valve on this truck. Everything works and looks good except for the fact that it appears to cycle too much. Sitting at idle the low side will be 30-34 and the high side will slowly build to about 265 and then i...

Fixes & Summaries for GM
Fix/Summary Answers
2006 Buick Rendezvous CXL 3.6L Starting/electrical VIN: 3G5DB03726
Good morning, sorry for the late close on this one, but as many of you pointed out it was a bad ECM,it was a bit confusing because at times i could communicate with the ECM and not the rest of the modules, but finally there was no communication at all to the E...
1991 Chevrolet G30 Hi-Cube 5.7L steering shaft VIN: 2GBHG31K1M
I got info on a few good places to look no luck I will just keep trying odd thing customer had another bus same year junked 2 monthes always thanks if anyone hears of a place that might have what I need you nhave my e-mail [...]
1996 Chevrolet K1500 Cheyenne 5.7L Excessive Emissions, Poor Idle Quality, Misfire VIN: 2GCEK19R9T
Thank you all for the replies. I can't believe it but it ended up being a combination of intake gaskets and the left exhaust manifold. It's running excellent now, customer and I are happy. Strange thing is, I couldn't pick up any vacuum leaks anywhere. Thanks... Trouble codes: P0300.
1999 Chevrolet Silverado 1500 4.8L Mechanical VIN: 2GCEK19V4X
Thanks to everyone for taking the time to respond. The suggestions were split fairly even. I went with the tried and true method and made my own lines. I was in a crunch for time and was looking to get the job completed as quickly as possible. The truck was ve...
2003 Chevrolet Impala 3.4L No Start VIN: 2G1WF52EX3
Hello all, sorry I took so long to reply. We didn't fix this one as the customer decided not to pursue. Most folks said to verify powers and grounds, which I did the next morning. I also checked the serial data line for continuity. I still suspect the PCM.... Trouble codes: U1000, U1016, U1255.
2005 Chevrolet Epica LT 2.5L Fuel VIN: KL1VB59L95
Called the dealer I deal with, they gave me the code for the Immobilizer and programmed and running. thank you very much for the guidance.
2007 GMC Sierra 1500 Classic SL 4.8L Misfire, MIL Lamp on VIN: 3GTEK14V67
Hello all. Well not sure 100% if it's fixed but this is what we did. Did replace the cam and crank sensors with OEM and performed the crank variation re learn procedure. Still miss fired. The customer took it to the dealer and they had two days on it and w... Trouble codes: P0300.
1985 Oldsmobile Cutlass Ciera LS 2.5L Drivability VIN: 1G3AJ19RXF
First, thank you all for help and in particular Hal from Montana, the last reply. I should have pinpointed this sooner. When unplugging the O2 sensor drops to 0 volts. When spraying the intake gasket the voltage jumps up to .8 volts. I guess what thru me o...
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