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Prev Professional Automotive Repair Technical Discussions for December 3, 2013
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Open Help Requests for GM
Help Request Answers
2005 Buick LeSabre Limited 3.8L Po171 VIN: 1G4HR54K15
Car seems to run fine but resets PO171 within a day or two of being cleared. Replaced 'O' ring on power brake booster connection at intake but no change. I'm guessing it's a vacuum leak so I sprayed carb clean around intake but it didn't change idle any. Are t...
2005 Cadillac STS 4.6L Surge, Stall VIN: 1G6DC67A95
I have an '05 Cadillac STS with an intermitent surge then stall when hot.The surge is quite abrupt and idle speed varies from 300 t0 700 rpm 2 or 3 times then stalls.If you restart it will repeat the surge and stall. If you shut it down , then restart it will ... Trouble codes: P0365, P0638
1998 Chevrolet Blazer 4.3L 3rd Gear VIN: 1GNDT13W8W
Okay this car belongs to a regular customer, but because we do not do Transmissions he took it to another shop. The customer states that the car would stay stuck in 3rd gear, it will not shift up, or down. We knew that these cars had ignition switch issues, ...
2007 Chevrolet Tahoe LTZ 5.3L cylinder deactivation system VIN: 1GNFK13077
This Tahoe came in for a front end noise but what the noise really is coming from the engine. It makes a tappet noise and a throaty intake noise for a few seconds after driving with throttle loaded then when you back out and have a light throttle at cruise spe...
2008 Saturn Astra XR 1.8L Starting VIN: W08AT27158
I am looking for some help from a Saturn tech. This 2008 Astra XR would intermittently have a no crank, no start condition. The customer would leave it sit for a few hours, go back to it and it would start. After numerous trips to another shop (dealer) it came...

Fixes & Summaries for GM
Fix/Summary Answers
1989 Buick Reatta 3.8L Poor Idle Quality, Hesitation, Misfire
Thanks for all of the replies. It seems that everyone jumped to the engine being bad when all that happened was a shorted fuel pump relay. I did check the compression, just for lack of anything better to look into, and I still have an average of 160psi in all...
1999 Chevrolet Malibu LS 3.1L Cooling Systems VIN: 1G1NE52J7X
thank you everybody for your help I did nothing. I am like the customer I don't understand why the gauge use to only go half way but now goes 3/4 way.
2003 Oldsmobile Alero GL 2.2L abs VIN: 1G3NL12F93
Thanks again for all the help.The customer opted for the black tape over the bulbs until after Christmas. The parts guy at the Chevy dealer assumed that the car had ABS due to wheel speed sensors being listed.I guess GM put the hubs with sensors on some models...
2006 Pontiac Grand Prix GXP 5.3L High Idle VIN: 2G2WC58C36
### THE FIX WAS TO REPROGRAM THE PCM WITH THE SAME CALIBRATION FILE THAT WAS ALREADY PRESENT IN THE PCM, WHICH WAS ALSO THE LATEST CALIBRATION AVAILABLE ### First, thank you to all of you who offered your help, advice and experience! Ed, Wayne, Colin, Russell... Trouble codes: P0507 (High Idle).
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