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Prev Professional Automotive Repair Technical Discussions for January 8, 2009
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Open Help Requests for GM
Help Request Answers
2000 Buick Park Avenue 3.8L convertor VIN: 1G4CW54K8Y
please help the tcc solenoid shows always on with snapon solus scanner and wont even go to off when using functional test on scanner. i think it may be grounded inside the trans. test light will light from battery pos to brown wire term 78 c2 at pcm (tcc pwm s...
1991 Cadillac DeVille 4.9L injector pulse width too high VIN: 1G6CD53B3M
there is no codes we have spark fuel air there is a flooding problem due to way too hi injector pulse width what controls injector pulse besides the computer? and what can i do too fix this problem?
1994 Chevrolet g30 5.7L Poor Idle Quality VIN: 1GBJH32K9R
This is a box truck or cutaway, the problem is no fast idle when cold, and being around Chicago area and 0 temps its rough sitting on the pedal for 20 minutes. After the motor gets some heat it runs good and idles fine. The motor is about a 2 year old rebuilt....
1996 Chevrolet S10 2.2L No Start, MIL Lamp on VIN: 1GCCS1442T
power wire to ign.moduel shows 12 volts check fuse box shows short to grd.,any idea where to start,also scanner shows ign. advance -3 with key in on position,new to comp.sorry for any mess ups,thanks again. Trouble codes: P0335, P0341
1997 Chevrolet S10 LS 4.3L turn signals VIN: 1GCDT19X5V
the turn signals work fine until you put the head lights on then the left one does not flash. the side marker goes dim and also the indicator on the dash goes dim. Both elements in the turn/running bulb light up dimly. any help would be great.
1999 Chevrolet Monte Carlo LS 3.1L temp gauge VIN: 2G1WW12MXX
this car came in complaining of an over heating problem and losing power when getting hot. could not duplicate customer concern, the vehicle got to 241 degrees and that was the hottest it got the fans come on and work properly. it has a code p1483 engine cooli...
2003 Chevrolet Silverado 1500 5.3L No Start VIN: 1GCEK19T83
Any help on this would be appriciated, The customer had this vehicle towed to our shop as a no start. The truck started everytime and had these codes in history. I checked BCM data and everything is normal. The truck works for a couple of days and then one t... Trouble codes: P1631 (Theft Deterrent start enable signal not correct), B2960 (Security system sensor data incorrect but valid)
1996 GMC Jimmy 4.3L MIL Lamp on VIN: 1GKDT13W3T
Hey Guys Hope You Can Help,This Gmc Jimmy Came In With Code PO1406 EGR Pintle Position Circuit Problem.EGR Moves Normal When Comanded To.Voltages At EGR Conector Are Normal.Except For When It Is Comanded To 100%.While Testing I Had EGR Sitting At 100% For A Fe... Trouble codes: P1406
1999 GMC Jimmy SL 4.3L evap drain hose VIN: 1GKDT13W1X
Hello everyone trying to find evap drain tube on this jimmy cant seem to find it any where without tearing evap box out. any help would be appreciated.
2003 GMC Sierra 1500 4.8L Poor Idle Quality VIN: 1GTEC14V83
At 101000 miles the plugs and wires were replaced as part of maintenance. The vehicle has no codes stored at all. It runs very smoothly down the road, and never misses. Shows no missfires. The vehicle had a fuel pump replaced at 101900 miles because it would d...
1998 Pontiac Sunfire GT 2.4L Hydraulic Clutch VIN: 1G2JD12T6W
The clutch was originally replaced for being worn out. However since then air is getting into the system and owner returns anywhere from a week to a month to rebleed. Each time we bleed the slave a small amount of air comes out and no more after that, the ped...
1999 Pontiac Grand Prix GT 3.8L engine VIN: 1G2WP52K2X
hi guys,I got one your going to love.Car came from dealer after 6 weeks could not get to run.They said it was an internal vacuum leak and needed a new motor.I can get the car to run if I drop the exhaust at the manifold and give it a large vacuum leak [i.e 3/8...
2004 Saturn Vue 2.2L Won't Shift Out of 1st VIN: 5GZCZ33D04
this car came in for a no shift and i have scanned it and i got p0700 and p0701. cleared code and went for a test drive. code p0700 returned first then p0701. no shifting out of 1st during test drive. reverse and park are ok. followed diagnostic procedure for ...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Skylark Custom 2.3L No Start, Poor Idle Quality, Cuts out, Misfire VIN: 1G4NJ1432N
the vehical had a blown head gasket. someone had replaced it at one time and over tightend it, causing it to be squashed between the cyls.
2001 Cadillac DeVille DHS 4.6L Misfire VIN: 1G6KE54Y31
Back to basics!!! Technician just started with coil instead of actually inspecting & diagnosing properly as required. Found hairline crack spark plug (#2). Replaced all 8 with new OEM ACD (removed NGK Iridiums) and running fine now. Thanks for all the repl... Trouble codes: 1381 (cylinder misfire abs/pcm data loss), P0301 (misfire 1), P0302 (misfire 2).
2004 Cadillac CTS 3.6L unable to remove key VIN: 1G6DM57724
Well, only a few replies on this one. The majority said PCM, one said to unplug the PCM & key should release if that was the problem, that did not work. I priced PCM to customer & gave him the option. They decided to remove the key lock solenoid & drive the ca...
1984 Chevrolet Corvette 5.7L Horns VIN: 1G1AY0785E
It turned out to be the actual anti-theft control module. I only learned this after replacing the door switches and not resolving the problem.
1991 Chevrolet S10 4.3L Vibration VIN: 1GCCS14Z8M
Well it is finally fixed. Wow! What a response! I got 31 replies within 24 hours! As many suggested, GM has a vibration problem with this engine. In fact, starting in 1992 a balance shaft was included in the engine to counteract unwanted vibration. As m...
1995 Chevrolet Blazer 4.3L No Start, Stall, MIL Lamp on VIN: 1GNDT13WOS
ended up being a map sensor messing with me. did a tap test on sensor it would drop to o.o2 volts thanks for all your help Trouble codes: P0107 (map sensor low voltage), P1107.
1996 Chevrolet Lumina 3.1L Stall VIN: 2G1WL52M1T
First I want to thank all who tried to help. I did what some suggested by testing the individual injector resistance and even tried a new ignition module which didn't change anything. Anyway I'm not going to call this a repair or a fix because I'm only hal...
1997 Chevrolet K2500 Cheyenne 5.7L drivetrain VIN: 1GCGK29R1V
O.K. so you all agree that some binding is norman in these trucks so we released the vehicle back to the customer and we will have to wait and see what happens.
2004 Chevrolet Silverado 2500 HD 6.6L trans temp VIN: 1GCHK29244
This is going to be a reoccuring issue with these trucks.I finally removed the radiator,the distance bettween the and evap core is just right to let dirt,grim and such cover the radiator enough to make the temp go up. thanks for the input
2001 GMC Sierra 1500 HD SLE 6.0L oil leak VIN: 1GTGK13U41
The oil leak was coming from to high to be rear main, so I just tore into it. Removed intake plenum and it was leaking from the valley cover. This is a one owner truck and engine has never been worked on but a couple of the bolts could have been taken out by...
2003 GMC Yukon XL 1500 SLE 5.3L power seat VIN: 1GKEK13ZO3
We recieved 7 replies to the situation and the most common repair suggest having the system re-flashed . We do not have the equipment to perform this procedure therefore we recommended she take the vehicle to the dealer. I have not heard from her yet. Thanks f...
2004 Oldsmobile Alero GL 2.2L Starting System, Security? VIN: 1G3N154C14
Alex from Georgia Thank YOU! The car is fixed this morning with a new fuse box LH Fuse Box! Thanks to everyone who took the time to reply truly! Here is quick recap. I performed his suggested test. It turns out the fuse panel at the drivers side has had wate...
2000 Pontiac Grand Prix GT 3.8L none VIN: 1G2WP12K4Y
Thanks guys for all the help especially to Gordon put me in right place cooling fan relay was not bad but had been replaced before unplugged to find it was burned at terminales cut off conector and replaced also replaced relay factory made relay retested clear...
1997 Saturn SC1 1.9L No Start, no pcm comm. VIN: 1G87F128XV
I got 10 replies to my help request. Thank you everybody. I was able to fix the problem after many hours of diagnostic time. I've always been hesitant to condemn pcm's and was hesitant to condemn this one. But after all the help I received and after all the di...
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