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Prev Professional Automotive Repair Technical Discussions for December 11, 2014
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Open Help Requests for GM
Help Request Answers
1988 Chevrolet S10 2.8L No Start, Poor Idle Quality VIN: 1GCCT14R3J
Well I am out of ideas and I need some input. Any help would be great. Customer had truck towed in because it wouldn't start in the morning. It had been missing when it is damp out and he had a cap and rotor. I installed cap and rotor. Still wouldn't start, ha...
2002 Chevrolet Trailblazer LS 4.2L Mode controls VIN: 1GNDT13S32
Have this trailblazer here with dual auto hvac that wont put heat on the floor. There are no DTC's and the temp sensors data looks good. Defrost actuator counts stay high and won't move when commanded. The published info from alldata leads to another HVAC c...
2003 Chevrolet Trailblazer LTZ 4.2L Stall VIN: 1GNDS13S13
Vehicle came in with engine dies with front defrost on. Checked a/c pressures, lo 30 psi, high 150 psi. Compressor not drawing voltage down. Cleaned throttle plate, for it was extremely dirty. Customer took vehicle, was happy how much smoother it idled. But, h...
2006 Chevrolet HHR LS 2.2L Poor Idle Quality, Surge, Stall, Misfire, MIL Lamp on VIN: 3GNDA13D96
Hello, I'm pulling out whats left of my hair over this one. Customer complained of stalling when his foot is lifted to apply the brakes and will barely idle at a stop and stalling when applying the gas to pull out from a stop. I did a preliminary computer test... Trouble codes: 0300 (Engine miss fire)
2002 Pontiac Sunfire SE 2.2L Cluster VIN: 1G2JB52442
Customer comes in for the cluster acting erratic or inop at time, says sometimes the speedo will stop working and the odometer will say error. We had the cluster sent out and rebuilt. Customer called the other day said it was doing the same thing problem is it...
2007 Pontiac Grand Prix GT 3.8L Front Crank Seal VIN: 2G2WR55477
This front crank seal goes from zero leak at idle to steady running out starting at 2-3000 rpm. Have tried 2 different national brand seals. Tried one installed flush on installed about 1/8" recessed. Tried wear sleeve on ba lancer. Tried new ac-delco ba lance...

Fixes & Summaries for GM
Fix/Summary Answers
2003 Cadillac Seville STS 4.6L MIL Lamp on VIN: 1G6KY54963
Special thanks to Roy, Jason and Russell. They hit the problem dead on. The cause of the concern was the serpentine belt. I removed the belt and the misfires stopped. A new belt was installed, the car was retested and no misfires were counted. I did notice tha... Trouble codes: P0300 (Random cylinder misfire).
2006 Cadillac CTS 3.6L Fuel Pump control circuit VIN: 1G6DP57706
I obviously misread the procedure, mistaking the FP ground instead of the FP relay ground. I connected my test light to ground ground, while cycling the key, and observed a brightly lit light every time. I then visually checked G401 and found no issues. I clea...
2001 Chevrolet Silverado 2500 HD 6.6L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GCHK29141
most replied said to replace high pressure pump. customer elected to trade in the truck Trouble codes: P0089.
2011 GMC Acadia Denali 3.6L passenger and auxaliary heater VIN: 1GKKVTED8B
I used every 'trick in the book' to purge the air out of the rear heater. Finally I made sure the system was completely full and put the radiator cap on while the engine was running. After about a half hour the rear finally started throwing heat. The passenger...
1991 Oldsmobile 98 Regency Elite 3.8L Battery Draw VIN: 1G3CW53L2M
OK, so as stated earlier, the cam sensor magnet was missing. Removing the timing chain cover turned out to be difficult. This model has a crank pulley and a separate balancer with an offset weight and shutter wheels for the crank sensor that required a puller ...
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