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Prev Professional Automotive Repair Technical Discussions for October 6, 2009
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Open Help Requests for GM
Help Request Answers
1990 Buick Electra Park Avenue 3.8L auto temp control VIN: 1G4CW54C3L
this is a auto temp control system. customer came in with no blower motor. tested blower motor to find it was burnt up. replaced motor ran for about 2 min, and quit. tested again and found it was fine. replaced blower modual and everything worked fine. lasted ...
1997 Cadillac DeVille Concours 4.6L e-brake pedal VIN: 1G6KF5496V
To all cadillac techs, please help. This concours intermittenly will release e-brake when key is turned on, without putting in gear. I have scanned all modules for codes none found. data seems to be showing the correct gear. very little help from all data & mi...
1999 Cadillac DeVille 4.6L duel zone climate control VIN: 1G6KD54Y5X
this caddy has no warm air coming from right side, pulled the access cover inside glove box and can see actuator moveing and will open and close when adjusting pass. temp. control, this only slightly affects air temp. even though actuator rod seems to have ful...
1998 Chevrolet Express 3500 5.7L Misfire VIN: 1GBJG31R8W
has misfire that constantly changes cylinders.watching misfire graph on tech 2 scanner one or two cyl are miss firing at a time but keeps switching which cyl is good or bad. Trouble codes: P0300
1999 Chevrolet Camaro Z28 5.7L Poor Fuel Economy VIN: 2G1FP22G5X
I have a 99 camaro im working on with an ls1 engine i pulled a p0132 and a p0152 code from computer both o2 sensors stay rich between 800 and 950 mv pulse width is 1.6 stft is 0 ltft varies from -10 to -15% both front o2 sensors have been replaced and b1s2 as ...
1999 Chevrolet Monte Carlo LS 3.1L #2 cylinder miss VIN: 2G1WW12M4X
My first post and I hope it doesn't make me look like an idiot. This is my car and itís driving me crazy. Wife drove it to town (40 miles on the highway) and called and said it was shaking when she stops at a stop light but fine driving on the highway. I check...
2000 Chevrolet Impala 3.8L contro VIN: 2G1WF55KOY
This is an Intermittant problem, At times the AC will not operate (turn on with switch) at all. panel is completely dead with no lighting in the switch, Indicating no power and blower will not function. this happened on a road test for another problem not rela...
2001 Chevrolet Suburban 1500 5.3L abs VIN: 1GNFK16T91
some times when stopping brake pedal pushes back just before coming to a complete stop scan data for wheel speed sensors are even but all three never drop to zero when truck is stopped all wheel speed sensors indicate 3 mph when truck is moving all are even ex...
2002 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC52442
I am lost on this one. Cranks but will not start. Backfire out of intake sometimes. Sometimes catches a little bit like on one cylinder but that is it. Seems as if the timing is way off. Started by swapping a new ignition module, no change. Took it back and ... Trouble codes: P0132 (O2 Signal High Bank 1 Sensor 1), P0171 (Fuel System Too Lean Bank 1), P0303 (Cyl 3 Misfire), P0621 (Gen Lamp L Control Ckt Problem), P0130 (O2 Sensor Fault - bank 1 sensor 1)
2004 Chevrolet Malibu 2.2L No Start, VIN: 1G1ZS52F04
Hello everyone, I have a sick malibu that does not crank over, the ctd lock light is on on the dash and will not disarm.I have tried to pull codes and can not comunicate with any modules on the car with any of our scan tools. The digital odometer say error. If...
2005 Chevrolet Cobalt LS 2.2L No Start, Stall VIN: 1G1AL52F35
hi there, customer towed vehicle in. they stated they went to start it up in the morning and it would start up and then shut off right away. we got it to the shop. plugged a scanner in and we had communication but no codes. i tried with a body cartridge but i ...
2005 Chevrolet Cobalt 2.2L starter, ignition VIN: 1G1AK12F55
vehicle came to me cranks continuously in park or neutral in run position without being turned to crank have to turn to crank and slide into reverse or drive to start have already rulled out ignition switch new from dealer relays all ok starter is controlled b...
2000 GMC Sierra 2500 SLE 6.0L O2 pattern VIN: 1GTGK24U1Y
This is a fleet vehicle we have in for training purposes. We are trying to be efficiant at taking snap shots of the PIDs for PM purpose and for future referance. We are using our new Bosch VCI and Shop Foreman Pro software. We noticed while doing a service bay...
1999 Oldsmobile Cutlass GL 3.1L Engine VIN: 1G3NB52M9X
Hey my friends,dont know what I got myself into this time.This poor customer has really been worked over on this one.But before I dive further into it and redo the work that has already been done,I thought I would pick your brains and get your opinion so as to...
2006 Other GM w52 4.8L abs light is on VIN: 5B4JPD2V06
Hi guyz, I have 06 workhorse 4 wheel ABS system and ABS light is on. In ECM had class 2 cummunication fault. I ERASED THE CODE AND IT HAS NOT COME BACK YET. there's Gateway module and has 3 green led's on it ,on the driver side under the hood mounted on the fr...
1995 Pontiac Bonneville SSE 3.8L Poor Idle Quality, Cuts out, Stall VIN: 1G2HZ5216S
Beating my brains on this one. I have 95 supercharged 3.8 mass air flow code p0101 followed by p1626 fuel enable signal lost. From the top i have tried new pcm, used pcm, new PROM, new MASS air flow, Used Mass air flow, Vats module. And i still am dropping my ... Trouble codes: P0101, P1626
1997 Pontiac Grand Prix GTP 3.8L wipers VIN: 1G2WP5214V
good evening fellow techs! im working on a friends car and he has this problem with the wipers not parking only when the wiper switch is on the delay setting. if you put the wipers on low or high then shut them off, the wipers will park... but when on delay th...
1997 Saturn SL2 1.9L Stall, Misfire VIN: 1G82K5276V
Hi I have this car in my shop. The complaint was misfires all the time and also a water leak. We replaced the waterpump and plugs and wires.The car runs great once it starts up and runs for a bit. The problem im haveing is when start up the engine misfires and... Trouble codes: 1599 (cc power mode)

Fixes & Summaries for GM
Fix/Summary Answers
1996 Buick Regal 3.8L 3-4 upshift VIN: 2G4WB12K9T
Thank you to all that offered help. As I said in my update, it was a problem with the trans fluid temp sensor. As a quick test, I ran two new wires from the trans connector to the pcm but that was not the problem. I then pulled the two wires for the trans t...
1995 Chevrolet C1500 Suburban 5.7L Stall VIN: 1GNEC16K5S
Hi everybody: Thanks to everybody who was sent his knowledge and experience (16 in total). Someones toldme that check generating voltage in pick up coil when start (koec), the voltaje must be ] 1000mV, then we check it and new distributor (afermarket) genera...
2001 Chevrolet C3500HD 6.5L fuel guage VIN: 1GBJC34111
Thanks much to all who pitched in on this one. I owe the group an appology for not getting my facts straight on my first entry. The fix was the ICP.After Charles got me on track and loking at the correct repair info, it was pretty straight forward.The kicker...
2002 Chevrolet C5500 6.6L No Start, Cuts out VIN: 1GDE5F1163
Found fuel hose at fuel control module by center of intake area was very spongy [ possibly calapsing from suction ]replaced hose. Have not been able to duplicate problem due to need to drive such extended miles at one time. Found NO suction leaks at filter ho...
2004 Chevrolet Corvette 5.7L Diff Leak VIN: 1G1YY32G44
Is this a fix or not, well that will be determined 6 months from now. I guess we came to a solid conclusion on how to deal with this problem. I would like to thank all who replied. Like I said, the vent tube was found to be clear and free, the fluid was cor...
2004 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: IGNDS13S34
Hi Y'ALL!! Thanks for all the replies! The problem was the evap solenoid was sticking! Some times it was stuck open, and some times closed! Replaced that and that part was fixed! That explains the o2 flat line and the truck would also stall after driving for s... Trouble codes: P0131 (B1 oxy sensor signal low been replaced), P0171, P0172, P1133.
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