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Prev Professional Automotive Repair Technical Discussions for September 7, 2010
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Open Help Requests for GM
Help Request Answers
1995 Buick Park Avenue Ultra 3.8L Poor Idle Quality, MIL Lamp on VIN: 1G4CU5219S
Have a check engine light on and when clearing codes i get no codes present but the light stays on and i can't get the idle below 2000 rpms the codes are for evap egr tcc and failed pcm the pcm power and grounds are fine i do expect pcm but how can i be sure i... Trouble codes: 1640 (1650 -), 1650 (1670 -), 1670
1998 Buick LeSabre Limited 3.8L Electronic VIN: 1G4HR52K1W
help gm guys this buick cam in with air blowing out of defroast and heater ducts it will not blow out of a/c vents tested programmer uder dash and replaced with new gm unit same result also tried a known good control head still same trouble has good vacum to p...
2002 Cadillac Seville SLS 4.6L Stall VIN: 1G6K54Y02U
Need some help on this one techs. Customer says this car stalls at 55 MPH on Accel and is Intermittently. We have not had it stall yet. No codes in pcm. Doesn't run bad. Just today put A and B crank sensors in it. Having my boss drive it to see if it stalls. B...
2005 Cadillac CTS 2.8L MIL Lamp on VIN: 1G6DM56T85
Thanks to anyone who can help. I have this 05 cts with a p0453 fuel tank pressure sensor high volts code. I have completely load tested all the wires in the circuit with a headlight and all are good. Checked from the pcm to the fuel tank pressure sensor plug ... Trouble codes: P0450, P0453
2000 Chevrolet Blazer LS 4.3L oil cooler VIN: 1GNDT13W12
Customer driving home from work,check gauge light came on and she saw no oil pressure on gauge and shut off engine.I arrived and found upper engine oil cooler hose disengaged from fitting at radiator.By-passed oil cooler and followed custome home.Good oil pres...
1996 GMC K1500 Sierra SLT 5.7L Differential VIN: 2GTEK19R9T
this truck omly does this in 4 wheel hi,(4 lo and 2 hi are unaffected) when the wheels are turned to hard left or hard right it feels like the brakes are applied as soon as you straighten the wheels it releases. has anybody seen this before? any help on this w...
1995 Oldsmobile Cutlass Ciera 3.1L No Start VIN: 1G3AJ55M0S
This vehicle came in on the hook, it would just brank, no hits or misfires. We had no codes, no rpm signal. We scoped the crank sensor ,had good pattern at sensor, we pinned the ecm ,had grounds and inputs , buy no spark and no noid. We put in new rebuilt ecm,...
2006 Saturn Ion-2 2.2L ingition lock cylinder VIN: 1G8AJ55FX6
first off...thanks in advance to all who offer wisdom on this issue. we have a 06 Saturn ION that has a returning problem: the ignition key will not turn counter-clockwise fron the run position. this obviously means the owner can not turn the vehicle off and r...

Fixes & Summaries for GM
Fix/Summary Answers
2001 Cadillac Seville SLS 4.6L piston knock/carbon VIN: 1G6KS54Y11
Thank you all for the suggestions. Replies ranged from inducing water, motorvac and GM top cleaner. I'll have the customer decide how he wants to approach it. I have a feeling when we replace the spark plugs, we'll let some top cleaner soak the top of the pist...
2004 Cadillac DeVille 4.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G6KD54Y44
OK so a new Mass Air Flow Sensor fixed this problem! & as one can see from reading all the help replies (and I will keep this short & leave it to folks to read the help replies since both my help request & update were way too long)most guy's experiences were t... Trouble codes: P0171, P0174, P1372.
1994 Chevrolet Lumina APV 3.1L wiper motor VIN: 1GNDU06L0R
Well, this one is fixed. The problem was in the wiper switch in the column. Thanks to all that sent replies, you guys are great!
2002 Chevrolet Blazer LS 4.3L hard starting VIN: 1GNDT13W42
Lots of fuel related responses, found most to be dead on what the problem was. I created some problems myself by not doing every test I should have. I did check fuel pressure before replacing the pump [which did fix the gauge problem] but didn't check after t...
2008 Chevrolet Express 3500 6.0L overdrive VIN: 1GBKG31K28
Thanks for your help, removed transmission and checked rear unit end play - was good. Disassembled transmission and everything internally looked really good including all platetaries. Transmission replacement was recommended by GM technical assistance. We repl...
2004 GMC W4500 Forward W4S042 4.8L No Start, hard start VIN: J8DC4B1645
This vehicle is fixed. I determined after all the replies and especially Jeff [...]'s comments that I could not diagnose this vehicle without bieng able to communicater with the PCM, and that requires the Tech2 with appropriate card or the Izusu software an...
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