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Professional Automotive Repair Technical Discussions for April 13, 2017 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 1999 Cadillac DeVille d'Elegance 4.6L Backfires thru intak VIN: 1G6KE54Y8X When backfiring through throttle body, scan tool data shows bank 1 going very lean-injector pulse width higher than bank 2,stft higher than bank 2 & bank 1 o2 reads under 50 mv bank 2 readings appear normal no misfires indicated on scan tool data i unplugge... |
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| 2004 Chevrolet Silverado 3500 6.6L No Start, Poor Idle Quality, intermittent smoke VIN: 1GCJC391X4 Customer had truck towed in for a no start condition, and I have not been able to get truck to become a no start. Customer stated that the truck would have white smoke out the exhaust while idling. Again I cannot duplicate the problems. my biggest question is ... Trouble codes: P0370, P2146, P2149, P0201, P0202, P0203 |
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| 2007 Chevrolet Impala LS 3.5L Tcm VIN: 1G1ZS57N57 Put a used transmission in and error message shows on odometer and power steering message shows on radio. Plugged in scan tool, and have no communication with TCM throwing code U0101, U2106, and C0000. Car wont crank |
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| 2000 GMC Jimmy SLE 4.3L Misfire VIN: 1GKCS13WXY This vehicle has the notorious cold start misfire and at times seemed to run better after reaching operating temp. Other times not. Vehicle seems to be worse during damp weather. Found the ECT sensor pigtail had loose connection and fixed as well as new sensor... |
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| 2004 GMC Safari 4.3L ABS Module VIN: 1GTDM19X74 I have this Safari with an ABS light that will turn on and off intermittently, or will stay on. The scanner will communicate with all other modules except the EBCM when the light is on. The PCM, Instrument panel, and SIR all have U1041 codes (Loss of EBCM/EBTC... |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 1988 Chevrolet S10 2.8L Stall VIN: 1GCCS14R7J thank you all for the replies once the weekend came and I could look at the truck I decided to replace the air idle control solenoid and after almost a week this seems to have cleared up his problem of the random shaking and stalling. |
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| 2003 Chevrolet Silverado 3500 6.6L No Start, Poor Idle Quality, Surge, Cuts out, Stall VIN: 1GBJK34143 A HUGE thank you to all that responded!! Most were correct with it being the CP3 pump. I also must thank you for the detailed testing procedures posted!! I put a vacuum gauge on the CP3 pump and it made no vacuum. I was having a issue believing the CP3 pump wa... Trouble codes: P0090, P1093. |
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| 2004 Chevrolet Colorado LS 3.5L None VIN: 1GCCS13664 Intermittent problem. Customer wanted to add Lucas oil treatment and see if problem goes away. Thanks for input from everyone. |
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| 2005 Chevrolet Tahoe LS 5.3L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1GNEK13TX5 Cylinders 5 and 7 showed continuous misfires on scantool. All my testing showed those cylinders were okay! So I pulled decided to pull bank 2 valve cover on passenger side and found a broken valve spring on cylinder 8. Put a lot of faith in those misfire PI... Trouble codes: P0300. |
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