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Prev Professional Automotive Repair Technical Discussions for February 29, 2012
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Open Help Requests for GM
Help Request Answers
1992 Buick Roadmaster Limited 5.7L EGR System VIN: 1G4BT537XN
Tried also a new ECU, verified prom with dealer, checked wiring continuity from ecu to the solenoid. All input sensor replaced. Checked all ref voltage ground and signal to the input sensors. Also jumped a bypass wire from ecu #435 gray pin # A4 to egr solenoi...
1987 Chevrolet R10 Custom Deluxe 5.7L fuel selector switch VIN: 1GCDR14K4H
i have a 1987 chevy r10 pickup with dual tanks that do not switch. put on new selector valve and dash switch. no power is present at dash switch but cannot find a wiring diagram that is helpful. have found pink wire at fusebox does have power. I would apprecia...
1996 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNCS13W8T
This truck has a code P1345 CKP/CMP correlation problem. The customer installed a crate motor and now have this code. I have been here many times and have always reset the distributor and set with scan tool. This one however has a distributor in it with a fixe... Trouble codes: P1345 (Crank/Cam Correlation problem)
2006 Chevrolet Trailblazer LT 4.2L Excessive Emissions, Poor Idle Quality, Stall, Misfire VIN: 1GNET16S16
This trailblazer came to us from another shop because of an intermittent stalling issue. They had already replaced the throttle body assembly and the cam position actuator solenoid. Test drove and couldnt get it to stall so brought it back to the shop and let ... Trouble codes: P0300, P0017
2008 Chevrolet Silverado 1500 WT 4.8L Mechanical VIN: 2GCEC19C78
this vehicle was towed in for no start found a loose connection at the battery,tighten this and that took care of the no start,now the customer complains that gauges are erratic and lights on ip flicker at times,checked a ll connections and found no problem,ha...
2009 Chevrolet Equinox LT 3.4L Electronic VIN: 2CNDL53F19
Techs, This 09 equinox has an intermittent traction control lite on (dash light) with code C0460. The customer has no steering issues or any other problems other than an intermittent light and message to service stibilitrack. He said he went on a 300 mile tri...
2004 Saturn Ion-3 2.2L Hesitation, Surge, Cuts out, MIL Lamp on VIN: 1G8AW12F84
I've got a real head scratcher here gang. This vehicle sets a P0700 upon startup. Look in the TCM and there are no codes in on demand. But there are 10 codes in memory. They will not clear, no matter what you do. Same thing with the PCM. It sets the P0700 in o...

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick LeSabre Custom 3.8L Front end VIN: 1G4HP54K9Y
I am shocked that as many of you have said this is a common problem and I have never seen this before. It was in fact the left front inner cv joint. We removed the cv shaft and separated the inner joint. It had very little grease in it from the factory and the...
2004 Buick Park Avenue 3.8L Rap VIN: 1G4CW54K04
Thanks for all your help turned out it was the BCM, the timer did not time out the RAP. Thanks Jason
2002 Cadillac Escalade 6.0L abs VIN: 3GYEK63N62
Replies i beleive were on the mark but since there were some other variables and i couldnt guarrentee the results, the used car dealer declined the repair. I beleive most were correct in that it was the switch on the EBCM but was not able to prove it. The swit...
1994 Chevrolet Corvette 5.7L Sys message flashes VIN: 1G1YY22P1R
Techs said to have a new Delco battery (yes I already did this) and have a trickle charger on the vehicle if it sets for any time at all. For your information the battery drain is.028mv, normal. Techs advise as normal setting battery deteriation of lower vol... Trouble codes: C081, H81 (Module 1), H72 (Module 9), ERR.
1995 Chevrolet Impala SS 5.7L Misfire VIN: 1G1BL52P7S
Well it runs great now. Some suugested a problem with EGR valve. I removed valve & made a block off plate then drove car. Misfire was still there. Ronnie from Ohio & Steve from Illinois got it right. The fix was to use OEM distributor & plug wires. The plugs I...
2003 Chevrolet Tracker 2.0L Valve Noise VIN: 2CNBE13CX3
Thanks for all of the help. I tried running it but it was really loud and decided to go another route. The suggestion to pump the lifter with diesel fuel was the way to go. My students removed the lifters and pumped the air out in power steering fluid (ligh...
2005 Chevrolet Silverado 2500 HD 6.0L Poor Idle Quality VIN: 1GCHK23U95
Much appreciation to you all for taking the time to offer assistance. Paul hit this one on the head. MAF turned out to be the cause. After getting it back out on the highway I could not get it to register more than 85% load even under full throttle. I think I ...
2001 GMC W5500 Forward W5R042 4.8L Exhaust brake VIN: J8DE5B1411
We figured out that the exhaust brake module was loosing voltage while driving, After isolting all circuits found Trans control module to be the culprit
2002 GMC Yukon SLE 5.3L no start VIN: 1GKEK13Z92
replaced passlock 3 weeks ago and still starting thanks to everyone for responding.The tip from richard to replace the sensor was just what I was looking for.
1996 Pontiac Grand Prix GT 3.4L alternator VIN: 1G2WJ52XXT
Thank You everyone fot the input.Alot of replys suggested tensioner or belt. I tried a new tensioner and it didn't help.I feel that it is actualy a problem in the alternator. I recomended a alternator from GM to solve the problem.The customer declined this rep...
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