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Prev Professional Automotive Repair Technical Discussions for February 6, 2015
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Open Help Requests for GM
Help Request Answers
1997 Chevrolet Blazer 4.3L abs
The truck came in for soft/spongy brakes. Randomly, the red brake light would come on, and the brake pedal would go to the floor. Other times the brakes would feel and work normal. We found that the proportioning valve (mounted to the ABS unit) was by-passing ...
2007 Chevrolet Silverado 1500 Classic LS 4.3L No Start, no crank VIN: 1GCEC19X17
Vehicle was towed in with a No Crank/No Start condition. Hooked up scanner and had no communications with any modules on the high speed data bus. PCM, TCM, SRS, BCM, ABS all no communication. Also noticed that when this was occuring, The digital shift indicato...
2005 Pontiac Grand Prix 3.8L heatre VIN: 2G2WP52235
loose heat going down the road. when at idle heat comes back, when on high blower speed- loose heat. 3 times come back for lack of heat- Acts like an air pocket. No coolent in Oil. check for head gasket failure- ok same to have alot of air in system when it co...

Fixes & Summaries for GM
Fix/Summary Answers
2005 Buick Rendezvous CXL 3.4L MIL Lamp on VIN: 3G5DB03E45
well I'm calling this a fix. We tried a new cat from long island cat and did a proper break in procedure. HO2S staying steady downstream. Customer has been gone for 2 weeks and no check engine light. Thanks to all who replied Trouble codes: P0420.
2004 Chevrolet Tahoe LS 5.3L Accessories VIN: 1GNEK13T84
Hey thanks for the help lane [...] started testing sp207 and I had a square wave then I started wiggling the sp207 withe lab scope on the light blue class 2 at the mod and it came to life . Loose connection on the pins for the spice comb thanks again lane
2004 Chevrolet Tahoe LS 5.3L Accessories VIN: 1GNEK13T84
This posted 2 tec helps I supplied the info on the first request
2006 Chevrolet Avalanche 1500 LS 5.3L Hesitation VIN: 3GNEK12Z96
thanks for all who replied. after I posted this I drove it alot more and I found that if I decell slowly from 4mph the frt sensors would drop to 3mph just before the rear. I could actually keep rolling like that for a while with rear showing 4 and frt 3. At ...
2008 Chevrolet HHR SS 2.0L Ecm VIN: 3GNCA73X38
Very educational experience here. Could have gotten vehicle running by poking around things customer had touched, but wouldnt have known why it was fixed and if it would stay fixed.Lots of good help here.I tracked the control line of run/crank relay from ign s...
2011 Chevrolet HHR LT 2.2L Poor Idle Quality VIN: 3GNBABFW3B
thank you guys i change the throttle body program it drive the car about a 100 mills light so i call a fix thank you guys again
2004 Saturn Ion-3 2.2L speedometer VIN: 1G8AW14F74
First thanks to Brady, Timothy, Craig, Bernard, and Brad for taking time to respond. Now as Paul Harvey used to say it's time for 'The rest of the story'. As I stated in my post, this car belonged to a used car lot that does all of their work in house.I ori...
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