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Prev Professional Automotive Repair Technical Discussions for September 18, 2007
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Open Help Requests for GM
Help Request Answers
1977 Buick LeSabre 5.7L hvac VIN: 4P69J7X121
I have a vacuum leak at the control switch at any position I select. The vacuum doors will not operate either. Vacuum is on the purple line in from reservoir tank. All lines seem to be in the right place but not sure. I've replacd 3 switches, all have the same...
1997 Buick Park Avenue 3.8L Stall VIN: 1G4CW52K2U
This car came in on a hook with the fuel tank collapsed in on itself with no fuel pressure i want to be sure that replacing the tank & pump & purge solenoids will cure this or if someone else ran into this and had other things be the issue haven't delt much wi...
1985 Cadillac DeVille 4.1L Electronic Level Control VIN: 1G6CD6989F
Hi all, Electronic (Air) level control inoperative on this caddy. Compressor operates if I jump the green test connector to ground, and the air shocks dont leak (amazing!). The compressor does kick on in normal operation, but only will run for about 10 seco...
1997 Cadillac DeVille 4.6L over heats VIN: 1G6KD52Y9V
cadillac techs i need help on this one car over heats on customer on long drives or when going up long hills, have replaced leaking head gaskets ,pressure checks ok hot or cold and no air bubbles in coolant when running, fans work.apears to be circulating ok. ...
1993 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality, Surge, Cuts out, Stall VIN: 1GCDC14K4P
It would have been easier to list what has'nt been changed on this truck that being the PCM, EGR, fuel injectors.I dont have access to the truck right now, I usually see it on the weekends. I have had this problem before I replaced the engine, And really made ...
1998 Chevrolet K2500 Cheyenne 5.7L Misfire VIN: 1GCGK24R5W
HELP ive got this 98 chevy 4x4 5.7 that a good customer just bought it came with several problems at about 45 to 50mph warm cruise iget a skipping sensation i can watch on my snap on scanner cylinder #5 & #7 misfiring but it does not show on history it has sev...
2001 Chevrolet Impala 3.4L power steering VIN: 2G1WF55E31
Hi Fellow Tech's, Customer complaint noisy P/S. Check out vehicle when turning the steering wheel is very noisy. In checking further I looked for leaks didnt see any. There is enough fluid in the reservoir. Now when I have someone turn the steering wheel, I ca...
2002 Chevrolet Trailblazer LS 4.2L 4wd VIN: 1GNDT13S52
Greetings fellow techs, Our local GM dealership is driving me nuts on this one. Vehicle came in with CK 4wd light on and no reverse in Transmission. Rebuilt tranny and reverse operates normally. Another tech scanned original TCCM for the CK 4wd light on. Came...
2004 Chevrolet Silverado 1500 5.3L Braking VIN: 2GCEC19T44
truck came in with soft pedal, test drove fond that the pedal would ingauge have way down and as coming to a stop would go to flour no leaks found, no air in system no codes and speed sensore are working we have been trying to correct this for 6/8 months what ...
1995 GMC Safari 4.3L engine VIN: 1GDDM19W1S
hi guys and thanks in advance for the help this one came in with a long crank (10 to 15 sec.) before starting, then surging after started. then on shut down it will start right back up but surge about 4 times then settle to a good idle let the vehicle set for ...
1998 Hummer H1 6.5L front brake VIN: 137ZA8438W
So my boss has purchased this hummer and I need to know the procedure for replacing front rotors, is there enough room to unbolt the axles and then slide the rotors out, or does more stuff have to come apart ??? any help would be awsome, Sean
1999 Pontiac Grand Am SE 2.4L Misfire, MIL Lamp on VIN: 1G2NES2T4X
Hello everyone, I hope you can help me out with this one. I have a 99 grand am that has a constant misfire at idle, but smoothes out a higher rpm. My fuel trims are near 0 and a misfire counter shows constant misfires on cylinders 1 and 4. When I pulled the sp... Trouble codes: P0300

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick Park Avenue 3.8L instrument cluster VIN: 1G4CWS2KXY
thanks to all that replied. as 90% of you said the cluster had something mechanically wrong after they jumped the car with the ignition on.
1998 Cadillac DeVille 4.6L A/C clutch VIN: 1G6KD54Y4W
Thanks to all that responded. When I checked the orifice tube, found bits of metal, so recommended new a/c compressor, accumulator, etc. Checked the resistance on the low and high temperature sensors and both were pretty high when compared to new ones. 4000 oh...
1991 Chevrolet P30 7.4L jumps out of gear VIN: 1GBJP37N2M
During the last test drive in this vehicle I noticed the radio lights flickered when the problem occured. I pulled over and checked the batt. cable on the starter and it was loose. The stud out of the solenoid was loose. Took off the cables and tightened stud,...
1995 Chevrolet C2500 Cheyenne 6.5L Hesitation, Surge, Cuts out, Stall VIN: 1GTTGC29F6
Thanks to all who replied, Laneard [...] hit the nail on the head. I was not real clear with my e-mail that we had done testing on the vehicle, re-reading my post it did appear we were throwing parts at it. We had checked fuel pump voltage and pressure, just...
1997 Chevrolet K2500 Suburban 7.4L rotors VIN: 1GKGK26JXV
Well the majority of people said they could be machined ,but MOST of them ,plus a few others recommended replacement only. Customer opted for the new rotors . I was suprised to find the vehicle came from the factory(BRAND NEW) with these rotors.Vehicle was s...
2002 Chevrolet Tahoe LS 5.3L MIL Lamp on VIN: 1GNEK13T52
OK, I just found out only 1 update is allowed so I'll close this contact. The vehicle does still have a problem though. Regaurding the P0351 code, I found out why I was intially confused. Snap-on Modis screen reads as follows "P0351 Ignition coil "A" pr... Trouble codes: P0351 (Ignition coil 1 control circuit malfuntion).
2004 Chevrolet Silverado 1500 4.3L guages VIN: 1GCEK14X74
Well this one is fixed but I must say I still dont really get it. After all I went through with all the help of you guys I couldnt come up with anything so we sent it to the local dealer. Within hours they called and said it was the ECM which was replaced unde...
2005 Chevrolet SSR 6.0L MIL Lamp on VIN: 1GCES14H15
All hints pointed to the need of a scan tool CAN adapter. As I have the Launch X431 CAN adapter I was able to read and reset the code (it was "clutch pedal travel sensor" code recorded). Thanks a lot and forgive me for my ignorance.
2001 GMC Sierra 1500 SL 4.3L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GTEC14W41
2005 GMC Sierra Denali 6.0L air bag/rear view mirror VIN: 2GTEK63N75
hey guys thx alot for all the help at least the people with more than a 1 word response. after checking the wiring under both seats and finding nothing,i decided to check the wiring from the fuse box to the SDM.i found a rodent nest under the fuse box and abo...
2006 GMC Savana 2500 4.8L Fuse 10 VIN: IGTGG25V56
Thanks for the help. I didn't have a good wiring diagram and would have wasted a lot of time tracing the harness. This is a Comcast van that someone cut and spiced wires everywhere. I few guys said go to ignition switch. They were right. I pulled The covers of...
1995 Pontiac Grand Am SE 2.3L Oil pressure VIN: 1GZNW55D0S
Hi thanks for the replies on this one. As we sort of expected the oil pump was the problem. I have never seen this before but I am told to expect this kind of behavior from this engine. We now have 30lbs at idle and between 60 and 80 lbs cruise. Thanks again t...
2001 Pontiac Grand Am SE 3.4L passlock system VIN: 1G2NP52E41
Thanks to all that replied. All but one was helpful.Most everyone though that the ignition switch, or more accuratly the hall effect switch built into the lock cylinder was the problem. I have replaced this part and the problem has not reoccured ( as yet). The...
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