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Prev Professional Automotive Repair Technical Discussions for February 17, 2010
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Open Help Requests for GM
Help Request Answers
2002 Cadillac DeVille DTS 4.6L trans light rattle at iddle noise iside trans VIN: 1G6KD57Y52
we have brought down the transmission on 3 diffrent occasions and cannot find a binding noise to justifield the rattling noise at idle only, we replaced torque convertor, overhaul kit,filter
1995 Chevrolet K2500 6.5L Cuts out, Stall VIN: 1GCGK29F3S
1995 Chevrolet K2500 6.5 Diesel, runs and then stalls
1997 Chevrolet Cavalier Z24 2.4L Surge VIN: 1G1JF12T4V
ok guys this car runs good down the road but coming to a stop and at a idle it wants to surge up and down hard. The tach will also jump up and down. With the scanner hooked up it acts like it looses injector pulse when it does it. I have replaced computer,cran...
2000 Chevrolet Blazer LS 4.3L Hesitation, Cuts out, Misfire VIN: 1G4FH879WY
Need help with this 2000 Blazer guys. Here's what's happening. Customer brought it in for cutting out and misfiring. Basically can drive, but if you lean into the gas pedal at all, it will start boging down and back fire at times. When in the shop this misfiri... Trouble codes: P0300 (Multiple misfire)
2005 Chevrolet Cobalt LS 2.2L MIL Lamp on VIN: 1G1AL12F65
Looking for help on wifes car. Only happened twice, on Christmas eve, and again today. Problems go away after sitting a few minutes. When driving for extended period of time, about 40 minutes. CEL came on, Traction light came on, power steering message came up... Trouble codes: P0700 (Trans control system fault), U0101 (Loss of comm with trans control module), U2100 (CAN bus communication), U2103 (Fewer controllers on bus than programmed), U2106 (Loss of communication with transmission control system)
2005 Chevrolet Silverado 2500 HD 6.6L Stall VIN: 1GCHK23295
Cleared codes, only one that comes back is 642. Truck will start, run fine then start running rough and stall. Sometimes will restart right away. Not a diesel guy. Anyone seen this before? Thanks Trouble codes: P0642, P0700, P1404
2006 Chevrolet Trailblazer LT 4.2L MIL Lamp on
Vehicle came in for a MIL. Diagnosed and replaced faulty evap vent solenoid. customer returns with MIL on again. This time it has a p0171 system lean. Intake was removed and inspected for vac leaks and cracks(none found) and reinstalled with new gaskets. Throt... Trouble codes: P0171 (system lean bank 1), P0455 (evap large leak)
1998 GMC Safari SL 4.3L Poor Idle Quality VIN: 1GKDM19W7W
Hello GM Techs, I have this vechicle came in with the high 3500rpm. the rpm always stay hight no matter hot or cold. i hook up the scan found code p0113 and also the intake temp show on scan -40.I took out the throttle boby check plate & the revet ok. I replac... Trouble codes: P0113
2001 GMC W3500 5.7L No Start, Cuts out, Stall VIN: 4KDB4B17R1
HELP!!! Afternoon everyone. This truck is breaking the bank here. The truck, though a GMC, is an Isuzu platform with a GM power train 5.7 L Vin coded R. Came in two weeks ago with a no/hard start, lacks power some times and will stall some times. After going o...
1999 Pontiac Grand Am SE 3.4L no injector pulse VIN: 1G2NE52E8X
Initially when the vehicle came in it had a loose connection at the main fuse block panel under the hood...that has been taken care of. Also had a stuck pin in the lock cylinder so the key would not turn. We replaced the lock cylinder and have gone through the...

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick Century Limited 3.1L No Start, Poor Idle Quality, Cuts out, Stall VIN: 2G4WS52JXY
To all thank you very much for all of the help. We eventually found that the vehicle had an after market alarm system on the vehicle. It had a kill switch that was pinched under the steering column. Thanks again for all the help. We have some great member apar...
1995 Chevrolet K3500 6.5L front axel VIN: 1GBHK34F8S
the problem was too much end play in rightaxle tube. thier is no parts availble from chevy . put in used 3rd member and fixed it. thanks to warren&gary for the good help
2001 Chevrolet S10 ZR2 4.3L Misfire VIN: 1GCCT19W11
Thank-you to all who gave input. The cause of the misfire was carbon build up on the actual valve guide. Only way to repair was to remove cylinder head and machine valve guide's. Was a costly repair but final product was done correctly. One for the book's. Tha... Trouble codes: P0300.
2001 Chevrolet Cavalier 2.4L Poor Idle Quality, Surge, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G1JF52T31
The customer finally returned with the car and I was able to do a compression test and recorded 235 PSI on all four cylinders. Andrew from Alberta, Craig in Massachusetts, Adam from Ontario and Jesse and Matt from Missouri all pegged it. After I pulled the t... Trouble codes: P0201 (Cylinder 1 Injector Circuit Fault), P0108 (MAP or Baro Signal High), P0300 (Random Cylinder Misfire), P0440 (EVAP Emissions System Fault).
2005 Chevrolet Silverado 1500 HD 6.0L Speedometer VIN: 1GCGC13U25
Thanks to everyone who responded. The customer decided to go the aftermarket route and purchase an aftermarket reprogrammer. I do not do custom work, it is an easy way to waste a lot of time and not get paid for it. Bottom line here is GM did not offer a VCI# ...
1989 GMC C1500 Sierra 5.0L Hesitation, Cuts out VIN: 1GTDC14H0K
Customer decided that he spent enough on this truck for now. It's his back up for a lawn care buisiness and only gets driven about 1000 miles a year. We told him what we found and replaced. He took it for a drive and was happy with it. It would only hesita...
1992 GMC G3500 Vandura 6.2L Transmission VIN: 2GTGG39J3N
Thanks to all who replied, great info. I replaced the rpm sensor...located in rear of engine as a dizzy would be. The code 85 went away so I assume this was the problem as the pcm could not compare input speed of enine with output speed of trans. I cannot b...
2003 GMC Sierra 1500 4.8L Extended cranking VIN: 1GTEC19V73
Thanks to all who replied. Hopefully I can add some useful info to this one. Thanks to Paul from New York for taking time to send the troubletree for this code. I had already read and followed this from Mitchell and the bottom line is they are dead wrong. The... Trouble codes: P0342 (Cam sensor signal low).
2007 GMC Yukon XL 1500 SLT 5.3L MIL Lamp on VIN: 1GKFK16367
Thank all of you that responded, I did go ahead and replace the throttle body assembly. I did not post the voltage on both the tps sensors with the truck running but the new one is 1v on one and 4v on the other. That is not what they were before and I could no... Trouble codes: P0121, P2119, P2135.
1991 Pontiac Firebird 3.1L speedometer VIN: 1G2FS2381M
OK guys I appreciate the info,IATN members always come through!I tested the purple and yellow wires to see if they were shorted together(good suggestion BTW)but they were not.I was able to access a GM manual from my friends at Ranz motors and found that this p...
1999 Pontiac Grand Am SE 2.4L Misfire VIN: 1G2NE52T6X
thanks guys , some one had put a new coil tower in this car being a delco part i skiped over it. but after checking every thing else i scoped it and found it was bad ... thanks again for every ones help Trouble codes: P0300.
2004 Pontiac Grand Prix GT2 3.8L abs VIN: 2G2WS54284
Unfortuantly customer decided to take the vehicle to the dealer. everything we tried from the replies we have gotten did not find the problem. if and when customer lets us know what is found we will let you all know.
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