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Prev Professional Automotive Repair Technical Discussions for August 8, 2012
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Open Help Requests for GM
Help Request Answers
1997 Buick Park Avenue 3.8L Power window - Passenger and both rear windows VIN: 1G4CW52K2V
Passenger power window and rear power windows do not function, up or down, from either their own switches nor the driver's master switch. Power door locks do function correctly. No codes stored. Using the special functions commands in the Tech 2, all window...
1995 Cadillac Eldorado 4.6L Water pump housing VIN: 1G6EL12Y5S
Car was towed in wit water running out of the water pump when adding to the coolant reservoir. Like a simple job until I tried to remove the pump with the water pump removal tool. Pump would not budge. On close inspection I found that the pump was badly corrod...
1996 Cadillac DeVille 4.6L Misfire VIN: 1G6KD52Y8T
No spark from cyl #6 & #7 coil. Vehicle came in for an engine misfire. Upon inspection found 2 spark plugs wires arching. Customer said its been years since replaced, we replaced still had problem. Customer said plugs was replace 3 yrs ago, we replaced all and... Trouble codes: PC030, PC138
1999 Chevrolet K1500 Suburban 5.7L p0154 VIN: 3GNFK16R7X
Truck came in few weeks ago with a list of codes, found that it needed a pcm. Replaced pcm came back with code p0154 low activity b2 s1. Replaced that oxygen sensor, no fix, wires are all good going from pcm to oxygen sensor, pcm good, oxygen sensor is new, it... Trouble codes: P0154 (Low activity b2 sensor 1)
2002 Chevrolet Trailblazer LS 4.2L Cuts out, MIL Lamp on VIN: 1GNDT13S02
Hi guys. This was on a post I thought I had fixed. Intermittent ses light combined with pedal position sensor problems resulting in power loss mode. I found out about the fan clutch problem spiking and replaced it. Seemed good for a week and came back. Warrant... Trouble codes: P1271, P1275, P1280
2007 Chevrolet Tahoe LTZ 5.3L Misfire, MIL Lamp on VIN: 1GNFC13J07
Thanks ahead of time got this truck shows a p0121 code but i find cylinder number two and seven misfiring. I swap coils and put plugs in still the same. Check injector balance checked good checked compresion checked good. Sprayed carb cleaner around intake and... Trouble codes: P0121 (Tp sensor 1 performance)
1998 GMC K3500 Sierra SL 5.7L Poor Idle Quality, Surge, Stall VIN: 1GTHK34R3W
Hello, We are battling with this 98 GMC 3500 pickup. Customer came in 2 weeks ago complaining of intermittent idle surge & occasional stall. We could not reproduce the problem at that time. Performed a throttle body service to clean out all deposits and sent h...
2007 GMC Yukon Denali 6.2L ride control VIN: 1GKFK63807
Greeting fellow techs. Customer states that air suspension compressor comes on every time they start vehicle and comes on while driving which it never used to do before. On the scanner when the compressor comes on the actuator commands are all at zero. The pos...
2003 Pontiac Bonneville SE 3.8L oil pressure guage VIN: 1G2HX54K33
I have this Bonneville I just picked up thats a good runner. No engine noise and no coolant in the oil. It does have 1 issue or maybe 2 depending... Oil pressure gauge is pegged at 120 psi and fuel guage will fluctuate so actual fuel level is unknown. My Solu...
2004 Pontiac Grand Prix GTP 3.8L 1st gear VIN: 2G2WR52434
Ok, tranny experts, got a potential purchase here I need some advise on. 2004 Pontiac Grand Prix GTP. When gear selector is in the DRIVE position, engine will rev but no forward movement. Not even a shudder. If I drop the selector down one more into manual shi...

Fixes & Summaries for GM
Fix/Summary Answers
1990 Buick LeSabre Limited 3.8L lifters VIN: 1G4HR54C1L
Thanks as usual for the great replies. Most were right, the #3 cam bearing had turned about 90 degrees reducing oil supply to a few select lifters. We opted to not install new bearings and replace with a used engine. The customer was happy and the car is down ...
1993 Cadillac Fleetwood 5.7L lean condition VIN: 1G6DW5271P
have passed the information to owner, he has decided to drive it and see what happens.
2000 Chevrolet Silverado 1500 5.3L Camshaft VIN: 2GCEK19T6Y
Well, we learned a lot about the 5.3 on this one and here's the summary of what we found during the engine autopsy. We pulled the engine, removed the timing cover, and found a broken timing chain which had some odd wear marks on one side...but what caused it t...
2003 Chevrolet Astro 4.3L assist VIN: 1GCDM19X63
I received several replies about booster failure, as well as pump shaft breakage, belt or tensioner problem, even restricted hose. I will have to call the fault in the reman steering gears (both) being restricted. I was unable to get another one quickly, so I ...
2005 Chevrolet Express 2500 4.8L Airbag light on VIN: 1GCGG25V35
Well, many thanks to everyone who responded with valuable advice. As everyone pointed out, & as I had suspected, it was indeed the front end sensor that failed & replacing it (this van only had one) caused the light to immediately go off when I turned the key ...
2006 Chevrolet Silverado 1500 WT 5.3L controler VIN: 1GCEK19B56
Gentlemen We installed the left side air temp actuator and the owner said he has had no problems since. I want to thank all who took the time to respond. We were leaning it that direction and it is nice to have your backup.
2010 Chevrolet Equinox LS 2.4L MIL Light VIN: 2CNALBEW0A
Hello,Thanks To All Who Replied.I Found Out It Was Covered Under GM's 7/100 Powertrain Coverage & Was Informed By My Friend Who Is The Acting Shop Foreman @ Bob Pulte Chevrolet That the Cam Actuator Solenoids Were Replaced & This Fixed The Problem & The Light ...
2007 Pontiac Grand Prix 3.8L low beam lights VIN: 2G2WP55257
Thanks guys this car is fixed. Turns out it was the head light driver module. New dealer part and the lights work like new. Again thanks for all the help. Tony
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