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Prev Professional Automotive Repair Technical Discussions for November 26, 2014
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Open Help Requests for GM
Help Request Answers
1999 Chevrolet Tahoe LS 5.7L noise VIN: 1GNEK13R7X
as the vehicle is started while cold soaked there is a popping or clicking noise in the accessory drive area. it almost sounds as if something is hitting against the fan. the fan is clear of debris. this noise happened after I changed intake gaskets, changed f...
2001 Chevrolet Silverado 2500 HD 6.6L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GCHK29141
I am trying to understand exactly what's going on and what PCM is looking for. I have replaced fuel rail pressure sensor because when I saw the data it was all over the place 10,000 to 15,0000 so fast I couldn't see them on the scanner. drove it 6 miles light ... Trouble codes: P0089
2011 GMC Acadia Denali 3.6L passenger and auxaliary heater VIN: 1GKKVTED8B
Both problems may be unrelated. Passenger side is cold all the time, driver's side has good heat. Rear heater core is cold. Topped off coolant but still no heat. Remove aux. heater hoses to release any air. Still no heat. Flush heater core. Rear had heat for a...
2006 Pontiac Torrent 3.4L Temp Blend Door VIN: 2CKDL63F26
Thanks for your responses -- has anyone used the Dorman 902-600 temp door repair kits for the Equinox/Torrent heater boxes. Looks pretty simple and saves 7+ hours labor for complete dismantling of the dash and heater box to replace the heater temp door. Any hi...

Fixes & Summaries for GM
Fix/Summary Answers
2003 Buick Rendezvous CX 3.4L Driver info center VIN: 3G5DA03E73
we had to use the tech 2 to go into the the ip and change the setting to display tire pressure indicator
2000 Chevrolet Express 1500 4.3L No Start VIN: 1GCFG15W0Y
Once again I want to thank all the replies that came in. Special thanks goes out to Kevin from N.C. I did not think about looking at wave form with the scope on the coil, although the coil was good,I found a broken wire in the pigtail connector. if you touche... Trouble codes: 420 (Cat low efficent bank 1).
2004 GMC Envoy SLE 4.2L Poor Idle Quality, MIL Lamp on VIN: 1GKDT13S14
Thanks very much guys for the replies! Got this one all fixed up. It ended up being 2 things that were wrong here. First of all, my stupidity caused a big part of this because originally when I was testing the TAC power supply at the PCM connector, I was te... Trouble codes: P1680 (TCC PWM solenoid circuit), P2176 (TAC system idle not learned), P0740 (TCC circuit open), P0753 (1-2 shift solenoid), P0785 (Shift timing solenoid 3-2 shift), P1682 (Ignition switch circuit).
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