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Prev Professional Automotive Repair Technical Discussions for May 4, 2012
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Open Help Requests for GM
Help Request Answers
1999 Chevrolet Astro 4.3L power steering VIN: 1GNEL19W3X
power steering makeing noise at idle and low speeds from inside vehicle appears to be comeing up from steering colum and when brake applied steering is hard turning from left to right .when brake not applied steering feels ok grouning noise doese not change .s...
1999 Chevrolet Blazer 4.3L No Start VIN: 1GNCS13W4X
I drove the truck into the garage and replaced the blower motor. It required me to remove the ECM to gain access. When I put it back together, it wouldn't start. I did the 30 minute passlock relearn 10 times but no luck. I realized that I forgot to disconne...
2002 Chevrolet Trailblazer LT 4.2L MIL Lamp on, Won't accelerate
These 2 codes were in the system and wouldn't clear. Checked according to flow chart and it says the pedal position sensor is faulty. Replace sensor and problem still exists. When looking at pedal position sensor voltages one is at 4.96v and the other is at 5.... Trouble codes: P1271 (Excessive Difference between pedal position sensors), P1275 (Accelerator Pedal position sensor circuit 1)
2006 Chevrolet Equinox LS 3.4L range sensor VIN: 2CNDL23F16
Vehicle is an 06' chevy equinox. Intermittently sets a p0705 in the tcm.Transmission defaults to 3rd gear and traction light comes on. This is the 2nd trip to my shop for this issue. This suv has an asin 5spd auto transmission and a stand alone tcm. This time ...
2007 Chevrolet Silverado 1500 WT 5.3L Shifts VIN: 2GCEK13M77
This silverado awd came in with no forward movement in d,or 3. If manually shifted in to 2 or 1 it will drive, and you can manually upshift into 3rd. In 3rd it slips, and nothing in od. If you come to a stop, it will not move again unless you again pull it int...
1999 GMC K1500 Suburban SLE 5.7L Driveshaft VIN: 3GKFK16R6X
We have a 99 4X4 GMC Suburban that is making noises. The history is as follows: 1.) The noise is a rattle / ratchet coming from the xfer case and/or the differential. 2.) The front driveshaft was replaced (by another shop) and the noises started. 3.) The fron...
2009 GMC Savana 3500 6.6L Ac VIN: 1GDJG31699
2009 gmc g3500 middle and left side vents blow hot air while the one far right blows ice cold air, local dealer reset hvac system. It only has one hot/ cold actuator our dealership says. I can remove the actuator and close the door and still no change. Is ther...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick LeSabre Custom 3.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Poor Fuel Economy, MIL Lamp on VIN: 1G4HP52K7X
Install a maf from different supplier. Just another case of sticking to your diagnosis. Don't second guess ur self with aftermarket parts. Next time going to install own only. Trouble codes: P0102.
1998 Chevrolet Blazer 4.3L No Start VIN: 1GNCS13W5W
Hello everyone, And thanks for all of your help/posts/information - after checking the fuel pressure and getting 55 psig (which most mentioned was a bit too [...]) I ended up making a tool to check the residual pressure after shut off and see if the pressure is...
2001 Chevrolet S10 4.3L Misfire, MIL Lamp on VIN: 1GCDT19W91
OK, good news is that the misfire is internal. Cylinder leakage test showed 15% loss on cylinder 1. GM warranty is replacing the engine and paying us to do so. Thanks for all of the replies, and support. Trouble codes: P0300.
2002 Chevrolet Suburban 1500 LT 5.3L Starter Relay VIN: 1GNFK16Z82
Thanks for all the help. Broken wire leading from Neutral safety switch to Starter Relay. Wire up inside the harness where the 2 NSS plugs merge together & enter the main harness. Replaced 4 pin NSS switch plug & repaired harness fixed all issues.
2004 Chevrolet Astro 4.3L Fast Idle VIN: 1GNDM19X84
I wasn't able to fix this one. There were no vacuum leaks and the TPS swept fine as did the gear indicator. The customer has just decided to live with it rather than having me dig into it further. Thanks again for your time!
2005 Chevrolet Equinox LS 3.4L Engin VIN: 2CNDL23F55
Thanks for all the tips. I flushed the crank case changed the oil.Started this morning with no lifter noise. Did a pressure test 40 psi at idle.
1988 Oldsmobile Cutlass Supreme Classic 5.0L Washer Pump Cover with Circuit Board VIN: 1G3GR11Y4J
Thanks for all the info folks. Great big help. We put a "universal" on it and wired it up and all is well. The suggestion to check with the AC Delco supplier that had it came after we determined tat we would wire the universal in place. Thanks again. M E
2002 Oldsmobile Bravada 4.2L No crank VIN: 1GHDT13S02
Thanks for all the help. After 8 or more times of relearn it runs.All the tips helped. I still have to learn what started all this but at least it runs
1974 Pontiac Grandville 7.5L convertible top VIN: 2P67W4X145
Thanks for the help to all that replied. I did not know that there was a vintage section on Ondemand. However, it did not provide any help whatsoever. I did call Mitchell. They told me they would call me back with the information, but they never did. I ran out...
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