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Prev Professional Automotive Repair Technical Discussions for October 21, 2009
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Open Help Requests for GM
Help Request Answers
2003 Buick Rendezvous CXL Plus 3.4L blinkers VIN: 3G5DB03E42
Blinkers wont work,But hazards work perfectly. I checked all the fuses and everythig seems fine. This car is an electrical nightmare and the awd disables itself when it feels like,I dont even know if theres a switch to take it out of awd...The tranny slips wh...
1999 Cadillac Seville STS 4.6L Drivers Power Seat VIN: 1G6KY5492X
I have both seats out of vehicle (From Interior Drying Project) Ran power and ground to each of the three motors under driver seat and could get them all to move in both directions. Removed two switches from drivers side cushion to see if they were interchange...
1991 Chevrolet Corvette 5.7L No Start, Stall VIN: 1G1YY2381M
Car cames in on wrecker. Owner has installed 2 fuelpumps and a regulator and still no pressure. I started testing and found no power to fuel pump fuse. jumped 12v to pump and it runs but the car cranks and dies after about 10 secs. Then if you try to restart i...
2004 Chevrolet Impala 3.8L MIL Lamp on VIN: 2G4WB52K0W
Third time back with this vehicle. Track lite comes on, brake light comes on, ABS light comes on. Most of the time, the traction control light comes on first. It usually happens when vehicle first started. Afterwards, brake and abs light come on. U1040 first, ... Trouble codes: U1040 (EBCM Communication Problem)
2004 Chevrolet Colorado 3.5L rear end VIN: 1GCCS14634
Vehicle Has Shudder/Vibration at 50 MPH, Seems to go away at 65. can feel slightly at 40. The vibration will vibrate threw the seats. steering wheel has no vibration.
1996 Geo Tracker 1.6L Poor Idle Quality, MIL Lamp on VIN: 2CNBJ1364T
This came in because it starts hard when cold. The engine light was on, but we could no communicate with the PCM. We have both a 8.2 update Modis and a Mastertech scanner that wont communicate with the vin look up or in global. Checked the DLC for powers, grou...
1999 GMC K2500 Suburban 7.4L Misfire VIN: 3GKGK26J7X
This big suburban came in with a grinding starte and flywhel destroyed, we replaced it and now it's OK, but customer stated that when it runs it feels like it misses, we checked and indeed the no 3 cylinder misfire counter was always going up, we checked the b...
2001 GMC Yukon SLE 5.3L dash gauges VIN: 1GKEK13T51
This one has been going on for about a month. What happens costomer drives 20 miles to work has cruse on hit a bump battery light flashes guages all go down cruse quits. vehical stays running. We have cleaned battery cables grounds ck connections pulled on wir...
2003 GMC Envoy SLE 4.2L Mechanical VIN: 1GKES16S53
Hey guys, working on this Envoy, runs great, no SES, super clean, it vibrates at idle. It is worse in drive than in reverse. It improves some when in park or nuetral. After inspection underneath, no problems with any contact from the body or frame to engine or...
2007 GMC Sierra 2500 HD SLT 6.6L No Start VIN: 1GTHK23687
Good morning all! Need some GMC help here PLEASE!!! Unable to program new ECM, but it begins with no start...Truck was rebuilt by local bodyshop tech. Truck was driven for several days after bodywork,then 1 day no start.Scanned(p0340),verified circuits,replace... Trouble codes: P0340
1999 Oldsmobile Bravada 4.3L heater VIN: 2B4GP44321
this truck has automatic temp control, the problem is when turning the heater control to hot the blower blows full hot like it is supposed to, if you turn the control to mid position the temp is very erratic, it may go to full cold or stay at full hot. i have ...
2002 Saturn L200 2.2L Stall, no security lamp VIN: 1G8JU54F22
Car starts then stalls ckp cam sensors still show good readings. injector pulse stops engine stalls installed new module no change new temp sensor no change. can any body give a direction to go Trouble codes: U1000 (serial comm), P1599 (testing and results)

Fixes & Summaries for GM
Fix/Summary Answers
1986 Chevrolet K5 Blazer Custom 6.2L no glow plug relay a VIN: 1G8ED18J7G
good morning to all in auto land, we have decided to add a pushbutton switch to activate this glowplug relay after verifying all glowplugs are good (i have already pulled cylinder heads off of hundreds of these while in the army) thanks to all that responded
1990 Chevrolet C1500 Cheyenne 5.7L Surge VIN: 1GCEC14K9M
Thanks for everyone that replied. talked to the customer again and he final told me that this truck use to be gas/propain. but he put it back to just gas. we noticed that there was a modual that modified the o2 senser acording to the sticker on it. i pulled ...
1994 Chevrolet C1500 Silverado 5.7L Stall VIN: 2GCEC19K8R
1997 Chevrolet C1500 Silverado 5.7L Misfire VIN: 1GCEK19R5W
talked to customer and he said he put injector cleaner in his tank,well now i have fouled injectors. will have to take intake off and clean injectors. thank you for the help Trouble codes: P00, 300 (Random/multiple cylinder missfire detected).
2001 Chevrolet Suburban 1500 5.3L abs VIN: 1GNFK16T91
thank you all for your in put tested each front wheel speed sensor with a vantage tool and found almost no signal from left front wheel removed sensor and cleaned rust from hub where sensor attaches also removed shim from between sensor and hub and rechecked s...
2002 Chevrolet Silverado 2500 HD 6.6L Misfire VIN: 1GCMC29132
Think we have this one. The injector was stuck open in cyl #3 and had the cylinder wet and we thought it was oil. The turbo was leaking oil into the exhaust and so we replaced the injector and turbo and all is good so far. Thanks for the ideas.
2006 Chevrolet Cobalt LS 2.2L shifts fine VIN: 1G1AL55F16
Well car is finally fixed,thanks for all the replies.I was certain it was in the drive and or the driven shafts on the left side of the trans.behind the channel plate.The problem was inspecting the bearings and the hub surfaces didnt reveal any visable problem...
2006 Chevrolet Cobalt LS 2.2L no crank VIN: 4PRUS16204
Adedayo from New York hit this one on the head. It was the aftermarket stereo. Installed the old unit and it fired right up.I don't know if the alternator had anything to do with it but it was bad too. Thanks to everyone who replied. A lot of great suggestion...
2008 GMC Sierra 1500 SL 4.8L No Start VIN: 3GTEC13C88
After espending hours of work on this one i desired to take to the dealership yesterday. I do really thank you all for the time and effort to help.I followed everything you guys suggested but i didn't have any result. Thank you Mark for the additional info... Trouble codes: B1001 (Option configuration error variant not programmed).
1999 Oldsmobile Cutlass GL 3.1L Engine VIN: 1G3NB52M9X
Thanks everyone for your help.Most of you were right on the money when you said the intake valves got bent.Yes! The 2 & 5 intake valves were bent.I have never seen this on a 3.1 motor only on interference motors.Goes to show what damage you can do when you are...
1999 Oldsmobile Intrigue GL 3.5L Misfire, MIL Lamp on
The car is still sitting and unregistered, but i'm confident that the CEL problem has been addressed and understood. NOW if i can just hold off until the weather stays cold, then the car should pass as long as no other codes pop up. Thank you all for your repl... Trouble codes: P0300, P0303, P0650, P0335.
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