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Prev Professional Automotive Repair Technical Discussions for September 24, 2008
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Open Help Requests for GM
Help Request Answers
2002 Buick LeSabre Custom 3.8L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G4HP54K92
Greetings. This 2002 Lesabre has a miss in it. Along with the miss is a rattle noise. Have checked spark plug(and tried new one with no luck), checked fuel pressure which is ok, checked injector flow--ok, checked for vacuum leaks(twice) and none found. Ohmed s... Trouble codes: P0300 (Engine Misfire Detected), P0440 (Evap leak), P0442 (Evap Emmissions small leak detected), P0452 (Fuel Tank pressure sensor low voltage)
1999 Cadillac DeVille 4.6L steering VIN: 1G6KD54YOX
I have a deville with a steering issue, I dont have pressure guages but went with tsb on pressure hose for fix but did not fix. has bad noise/vibration when steering either direction,it does have power assist when steering but u feel the "pulsing" in the wheel...
2000 Cadillac DeVille DTS 4.6L Electronic suspension VIN: 1G6KF5792Y
This vehicle came to us after an extended drive with a full load in the trunk with a message stating that there was a suspension malfunction and the speed would be limited to 90mph. We performed a diagnostic check and found current codes: C0577 & C0662. This v...
2004 Cadillac DeVille 4.6L mirror turn signal VIN: 1G6KD54Y14
replaced mirror thinking this was the problem but after i replaced the mirror the turn signal inside does not work on this one either but the one i removed had the plugs going into the door control module but the other one had two called the dealership and the...
1972 Chevrolet C-60 366CID Misfire VIN: IG34589966
Hi Guys and Girls. Does anyone have the firing order on this vehicle. I just done the heads. I have several programs and books and cant find anything this far back. I have a misfire very bad on # 8 and everything seems ok. Your replies will be appreciated.
1990 Chevrolet Corvette 5.7L headlight doors VIN: 1G1YY2389L
Hi all. Ive got this corvette with the hideaway headlights and the actuator motors that run the lights open and shut are slipping as if there is a clutch in the gears. I have removed one of the covers to watch it work, the gear seems to be OK, but the inside o...
1994 Chevrolet G30 Chevy Van 5.7L Master Cylinder VIN: 1GBGG39KOR
Well... Usually this type of problem is not as tough as this, but here goes... This van came in for a sinking pedal, the nearly new master cylinder should have been my first clue of impending loss of capital... My star man says master cylinder, so replace it w...
2001 Chevrolet Silverado 3500 6.6L Hesitation, Cuts out VIN: 1GCJK39141
Hello, This 2001 Duramax was towed to the shop not running and the engne partially disassmebled. Customer was going to attempt repair, but thought better of it. Turns out engine had 2 blown head gaskets, spun cam gear and all 16 pushrods bent. After being tor...
2003 Chevrolet Impala LS 3.8L high beam indicatorino VIN: 2G1WH52K43
Car came in with high beam indicator inoperative and the high beam out message on in the message center. Customer also reports that the red LED on the radio stays on and the radio loses some of its functions.Checked high beam lights for operation-ok. Also chec...
2004 Chevrolet Workhorse 8.1L Failed ECM Flash VIN: 5B4MP67G44
YiKES! I did a ECM flash to update transmission software on this Motorhome. All went well until I got to uploading the ECM. This is when the Tech 2 was rude enough to inform me that the "Upload Failed". The trouble seems to be "line 8 Code error BF" I'm not su...
2005 Chevrolet Silverado 2500 HD 6.0L drive line vibration? VIN: 1GCHC24UR9
This vehicle belongs to a pool service company that has a work body and all of the tools needed to do pool repairs. The driver said it had a vibration when he would go over a bump, he would let off the pedal and the vibration would go away. I replaced the cent...
1988 GMC C1500 Sierra SLE 5.7L Poor Idle Quality, Hesitation VIN: 2GTDC14K8J
I have a 88 gmc 1500 that idle surges only when it is cold and has vacuum fluxuation between 15-20in only dureing surge and about a solid 20 when warm and running normal, als has slight power loss, But runs smooth when warmed up and runs ok, I have checked fue...
2003 GMC Sierra 2500 HD SLE 6.6L No Start VIN: 1GTHK23163
We found air in the system, the fuel filter seal was damage and we replaced the filter again and bleed it, the problem got solve with the difference that when engine hot(normal op temp) has a 3 sec delay starting. We decided to keep the truck in the shop for t...
2004 GMC Sierra 1500 SLE 5.3L heated seat VIN: 2GTEK19TX4
Hello techs, have this 2004 sierra with heated seats turning on by themselves - we have seen the drivers seat do this ourselves (customer states passenger seat does this as well). Checked powers and grounds to under driver seat module, check wiring for faults ...
1992 Pontiac Grand Am SE 2.3L compressor won't cycle VIN: 1G2NE54D9N
Originally, we had a bad compressor. Replaced it with a re-man. While we were at it, we replaced the expansion valve, reciever/drier, and flushed the system. After sealing it up, we charged it and found that our pressures were way off balance. Low side was at ...
1993 Pontiac Grand Am SE 3.3L Surge VIN: 1G2NE51N5P
car runs normal in all other gears but park, when placed it park, the car starts to surge. when rad fan starts, the car starts to surge also.
1997 Pontiac Grand Am SE 2.4L low trac light
This vehicle was brought in due to inoperative gauges and the warning lights being illuminated. The "low fuel", "low trac", and other warning lights were on, and none of the gauges worked. I installed a used IPC and relearned the VTD and all seemed well. Howev...
2000 Pontiac Montana 3.4L PS Pump VIN: 1GMDX03E9Y
I've got another oddball problem. Customer complaint is a whine noise when driving, worse when accelerating. I test drove it with no noise initially, after about 5 miles I could hear a whine noise from the right front of the vehicle that varied with engine spe...
2002 Pontiac Grand Prix GT 3.8L Stall VIN: 1G2WP52K42
Car came in for an intermitent stall condition. Customer states when slowing down to stop or make a turn the car will stall as if you shut off the ignition. He puts it in nuetral and it start right away and runs fine. I have not been able to duplicate this sym...

Fixes & Summaries for GM
Fix/Summary Answers
1989 Buick Reatta 3.8L temp gauge
lot of quick replies some i had tried already,others i tried just to be sure,car is not repaired customer declined any more time had to have car for transportation,car does not run hot gauge is reading false for some reason,gets to 118-120 jumps up 90-100 degr...
1994 Buick LeSabre Custom 3.8L Stall VIN: 1G4HP52116
Thanks for the many replies. The ones that said pcm were right.The other shop had replaced with a used one.As you said,and I found out later that loads of this model had bad pcms.Rebuilt pcm fixed it.Many thanks Trouble codes: 341 (Intermittent Cam Signal), 361 (EST line not toggling).
1992 Cadillac DeVille 4.9L fuel data center. climate control VIN: 1G6CD53B4N
thanks to Juan, James and Andrew for your replies. the problem ended up being a bad bcm. i tried an aftermarket one and had the same problem . i called my local gm dealer and ordered one and all is ok. no shorted modules , just a bad bcm. thanks again!!! God ...
1999 Cadillac DeVille d'Elegance 4.6L No Start VIN: 1G6KE54Y5X
I am closing this for now because it needs a pcm, but it has not been approved yet. I thank those that offered help. I found out that it does not need a relearn because the ipc that was replaced was actually the same one with a new bezel. The issue now is no c... Trouble codes: B2750, U1255, P1631.
1977 Chevrolet C10 Cheyenne 5.7L Gasoline VIN: CCL447F479
I did & Ck evrything that you all advised, even drop the fuel tank & Ck check valve inside (Had ball & needle valve,Clean valve & reassembled, still do the same, neighbor technician advise drop tank again, gut the check valve and install outside vent with chec...
1998 Chevrolet K1500 Cheyenne 5.0L Pump motor VIN: 1GCEK14M5W
Found out WHEN the front hubs were cleaned and replaced. Was 4 and 5 years ago! In New England, rust scale builds up fast from salt/sand mix during long winter. Did do some careful scope work before and after i cleaned the f. sensor mounting sufaces today. Bot...
2002 Chevrolet Silverado 1500 5.3L unknown VIN: 2GCEC19T02
The vehicle as far as I know is not fixed. I contacted the customer twice with the information I recived and have not been able to get him to return. The replies about contaminated wheel speed sensors and faulty master cylinder sound the most likely for the im...
2005 GMC W4500 Forward W4S042 6.0L No Start, Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on VIN: 4KDC4B1U05
Well, I'm not sure what I did or where I did it but this thing is fixed. I pulled the entire harness apart from the engine to the ECM. I found no bad connections or melted wires. I cleaned every contact point, connector, and ground with QD cleaner and reassemb...
1995 Saturn SL 1.9L rear brakes
Thank you for your replies. I shared this information with customer, they decided it was more than they could handle?!?!? So they will bring it back when they can handle it. thanks again.
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