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Prev Professional Automotive Repair Technical Discussions for April 9, 2015
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Open Help Requests for GM
Help Request Answers
2004 Chevrolet Aveo 1.6L MIL Lamp on VIN: KL1TD52654
these 3 codes p0300 p0700 91781 keep coming back as soon as you get to 20 mph we did the valve bulliten 05-06-01-030d and all where replaced with new seals. runs fine also speedo only reads half of speed going installed new speed sensor and did not change than... Trouble codes: P0300, P0700, P1781
2010 Chevrolet Express 1500 4.3L Poor Idle Quality, Hesitation VIN: 1GCUGADX0A
Hi guys. I have a new one iv not seen before. When van has warmed up, put in dr. It bougs down and starts pinging like bad fuel with a over heated eng. But it is not. Park or netral is fine. My load percent goes to dr. Idle is 30 percent load in park. V...
2004 GMC Envoy XUV SLT 4.2L Misfire VIN: 1GKET12S24
Greetings All. This 04 Envoy is driving me nuts. When in overdrive at cruise, worse going up hill, you get what feels like a misfire. I have changed the plugs ( had Autolites, now AC), there are no codes, no misfire counts in history or live, all data looks no...
2007 GMC C5500 Topkick C5U042 8.1L allison trans VIN: 1GDE5E1G37
posting this for a friend. codes po848, 731, 762, & 751 set if try to move move before warm. shifts fine after 10 mins of running. PRNDL blinks & goes blank during warm up. anybody seen this. any ideas Alli

Fixes & Summaries for GM
Fix/Summary Answers
1994 Chevrolet P30 7.4L Front Brakes VIN: 1GBKP37N9R
Thanks to all who replied- and some who took the time to follow up. I hadn't given the details of my SOP for machining rotors, which is pretty exact- we use an FMC lathe and the final cut is supposed to be less than 2 on the dial- preferred is 1 1/2, then a sw...
2005 Chevrolet Silverado 1500 LS 5.3L Poor Idle Quality, Surge, MIL Lamp on VIN: 2GCEK13T35
Kept looking for vacuum leak and watching fuel trims, brakes work good and feel good. Replaced o-ring on back of master cylinder same problem, replaced brake booster fixed problem fuel trims ok and no idle surge thanks for all the help. Trouble codes: P0171, P0174.
2009 Chevrolet Silverado 1500 WT 5.3L t-case VIN: 3GCEK13379
Thanks to all of you for the help. I will summarize this repair as well as possible. I wish I were savvy enough to get pics from my iphone onto IATN to show oscilloscope patterns. Anyway, I will say that the service manual diagnostic routine SUCKS! Very poor ...
2009 GMC Sierra 1500 SLE 5.3L Programming VIN: 3GTEK23M79
Our local machinist led me to . Loads of information and where and what is needed. He also reprograms the pcm at a very reasonable price. Thanks to all for the info supplied.
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