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Prev Professional Automotive Repair Technical Discussions for August 1, 2014
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Open Help Requests for GM
Help Request Answers
2007 Cadillac CTS 3.6L Ignition lock/ shift interlock VIN: 1G6DP57797
This may be the vehicle that makes me change careers! The key will not roll back to the off position. The solenoid at the ign lock cyl is ok, and will enable key rotation when solenoid is hotwired. The shift lock is not locking properly either, both related. T...
1996 Chevrolet Cavalier 2.2L Excessive Emissions, Poor Idle Quality, Hesitation, MIL Lamp on VIN: 3G1JC1247T
Car runs fine in open-loop, it has great vacuum idles fine. Once in closed-loop the vacuum slowly drops from 18in/hg - 8in/hg and eventually stalls out. I see this happening on the scan tool and actual vacuum gauge. If I unplug the O2 sensor or tsp to force it... Trouble codes: P0171 (Bank 1 system lean)
2000 Chevrolet Tracker 2.0L Stall
Customer just brought this car. It was tow in for complain of dieing while driving. This car will run outside in the sun about 20 minute and it will die. When it about to die, it will stumble about 15 second before it die ( act like it about to run out of gas)... Trouble codes: N0NE
2008 Chevrolet Silverado 1500 LT 5.3L MIL Lamp on VIN: 2GCEK13388
Truck is running fine, O2 sensors are switching and not setting codes, only code P1174 keeps coming back within 2 miles. Short term fuel trims are switching + to -. Long term is -24. Not setting any other codes. I have read the tsb about he injectors, but I do... Trouble codes: P1174

Fixes & Summaries for GM
Fix/Summary Answers
2007 Chevrolet Silverado 1500 Classic LT 4.8L Excessive Emissions, Poor Idle Quality, Hesitation, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCEK19V57
Guys thanks for the great input. We did completely drop the cats and nothing changed, I replaced the mass air flow sensor since the reading was high, but still had the problem. During one of the road tests we were losing spark on left hand turns. we started ch... Trouble codes: P0300.
2009 Chevrolet Corvette 6.2L Speedo drive VIN: D000015749
After I posted my help request, help came in the form of a suggestion from the trans. shop I visited before I made my post. I am copying an email I sent out 2 days ago in response to one of the last response that came in asking for clarification on the electri...
2002 Pontiac Grand Am GT 3.4L Guages VIN: 1G2NW52E52
Sorry for the late reply. But it did turn out to be a defective abs module. When I unplugged it everything was acting normally and I had communication. Installed a new abs module a problem solved. Thanks everyone.
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