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Prev Professional Automotive Repair Technical Discussions for August 17, 2013
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Open Help Requests for GM
Help Request Answers
2006 Chevrolet Silverado 1500 WT 5.3L 5v ref circuit VIN: 1GCEK19B76
Live data shows low press on the low switch and high press on the high side switch volt meter shows 5v at switches both switches have been replaced what could cause the 5v ref code and a/c inop also if I command a/c on with modis it will come on but the coolin...
2008 Chevrolet Suburban 1500 LTZ 5.3L MIL Lamp on VIN: 3GNFK163X8
Long term fuel trim bank 1 goes to -27 to -30 on a long decel at higher speeds 45+. Bank 2 is normal. As soon as you touch the gas pedel it switches cells and drops to near 0%. We have Swapped front and rear o2 sensors side to side. Amps ramped one injector on... Trouble codes: P0172 (rich bank 1)

Fixes & Summaries for GM
Fix/Summary Answers
2004 Cadillac SRX 4.6L Misfire, MIL Lamp on VIN: 1GYEE63A84
Well gentleman you have helped once again. Thanks you very much.The problem was like you all mentioned it had a fuel trim issue.I'm afraid I was unable to give you the fuel trim and my buddy didn't give me the best info.I started by dis-connecting the H02 sens...
2004 Chevrolet Silverado 2500 HD 6.6L Injector Knock VIN: 1GCHK23194
We replaced the #6 & 8 injectors. This fixed the fuel knock and the fuel rates are back to normal. I did notice the # 8 flow rate was at .23ms #6 was .27ms. The injectors must have been leaking enough fuel to cause the knock noise. After replacing the injector...
2007 Chevrolet Silverado 3500 Classic LS 6.6L Neutrals in Rev or Drive VIN: 1GCHK33D17
This one is fixed, as several had said look at the speed sensors, I watched the Output speed sensor on the lab scope and even though it would not set a code I got no signal until about 3 miles per hour. After installing a new sensor I got signal as soon as it ...
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