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Prev Professional Automotive Repair Technical Discussions for December 16, 2010
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Open Help Requests for GM
Help Request Answers
1995 Buick LeSabre Custom 3.8L Stall VIN: 1G4HR5210S
car will start and run fine as long as you want till you raise rpm over 2000.then tach and other gauges jump around,looses fuel pressure and communication with scanner. car will die and not restart till key is cycled off and on.pcm has been replaced with reman...
1991 Chevrolet K2500 Cheyenne 6.2L Poor Idle Quality, Surge, Stall VIN: 1GCGK24J4M
Hello Diesel tech;s, This one runs fine but at times it will just quit, so far at idle only. Then after restarting it will run rough, like there is air in the lines, until she cleans out and then smooths out. Sometimes it may run rough for a few minutes. The w...
1992 Chevrolet C2500 Cheyenne 6.5L Tps VIN: 1GCGC24F5N
TPS value gose to defalt intermitently and stays stuck at 35% throttle opening. TPS bench tested good, intalled new on out of frustration. TPS signal would change as expected when measured at TCM harness connector. TCM was replaced with Delco re-man. NOW CHECK...
1996 Chevrolet Blazer 4.3L Misfire VIN: 1GNCT18W0T
hi guys i have this s-10 blazer in the shop misfiring pulled coded came up with po 300 checked fuel pressure pressure was good also checked for leak down it held pressure overnight i next looked at the cap and rotor and wires they were in good shape then i pul... Trouble codes: P0300
1996 Chevrolet K1500 Suburban LT 5.7L Park engagement VIN: 3GNFK16R7T
I am an automotive teacher at a high school, a teacher here has this problem. Problem just started, I think it has to do with the park pawl, I haven't worked on these transmisions before so I don't know how they engage park. I have an old version of [...] ...
1999 Chevrolet Lumina 3.1L Dragging VIN: 2G1WL52M9X
This fine GM product came in with the customer stating," I stopped for a stop sign and the car would not go anymore." I went for a drive with the customer and the vehicle ran great at first then when we stopped at a stop sign the AIRBAG light came on and the c...
2001 Chevrolet Tahoe 5.3L Rear of engine VIN: 1GNEC13T51
This car has a major oil leak. At idle there is just a very slight leak but when it drives on the road it becomes a major oil leak. The leak looks to be coming from the passanger side on the rear of the engine. Intake valley is dry. We used a gm tool to put in...
2002 Chevrolet Silverado 2500 HD 6.6L Starter & Ring Gear VIN: 1GBHC24162
I posted this as an electrical problem because a starter is involved. This is more likely a mechanical issue. This was towed in. The customer complaint was that he had to boost it the previous 2 days in order to start it. It was quite cold. I was expecting a ...
2002 Chevrolet Trailblazer EXT LT 4.2L 4wd VIN: 1GNDT13S72
customer came in with a complaint of noise in 4wd. test drove and verified there is a noise in the 4wd.it is a selectable system, so in two wheel drive there is no noise heard.the noise is in 4wd while driving .it does engage and work the system, but while dri...
2002 Chevrolet Tahoe LS 5.3L Hot Cold Mode Actuator VIN: 1GNEC13Z72
GM HVAC Help needed. I have one hair left so please help me to keep it. This 2002 Chevy Tahoe has a Auto HVAC Controle head. We have tried everthing mentioned in the Fix database.The HVAC Controle head has been replaced with three differant ones also a new GM ...
2003 Chevrolet Malibu 3.1L No Start VIN: 1G1NE52J43
Vehicle came in as a no start.Checked fuel pressure and spark,working fine.If I spray carb cleaner into throttle body would run until I stopped carb enrichment.While running scanner showed cam & crank sensor input.I had the tech remove right underpanel and sma...
2005 Chevrolet Equinox LT 3.4L Goes hot at idle VIN: 2CNOL73F85
This Equinox will run ok until it sits at idle. After a few minutes the temp guage will start to climb to over 3/4 then we notice the heat starts to die down. The upper and lower hoses start to get cooler. When you rev it up to about 2000 rpm the guage drops r...
2004 GMC Yukon XL 1500 Denali 6.0L Accesseries VIN: 3GKFK16T84
Have gmc that has the time delay accessories staying on after key is out and doors opened. Thought to be bad switch from monitoring position with scanner and it was reading on at times with key off, but as soon as we unplugged and try to put new one in the rad...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Chevrolet K2500 Silverado 5.7L Misfire, RPM High VIN: 1GCGK24R3W
I Would like to thank everyone who replied on this one. After a confirm that the head was good.. It came down to intake or injectors/or both So we tried the Donald from Montana simple test. Remove the breather or oil fill while its running.. RPM went off the ...
1999 Chevrolet Express 3500 5.7L Catalytic Converter VIN: 1GBHG31RXX
Well the customer opted to go with the factory cat after all. We will just cut and weld it into place. Thanks to everyone for the replys; although we are going with the factory cat in this instance, it is good to know for the future that we can use aftermark...
2001 Chevrolet Tahoe LS 5.3L Mechanical VIN: 1GNEK13T61
The transmission was at fault. The custumer didn't care why it was failing he just went with a jasper remaned unit. I suspect the pump or converter as there was a lot of shavings in the pan.
2002 Chevrolet Trailblazer LS 4.2L Headlights VIN: 1GNDT13S72
Thanks to all that provided information. One of the bolts in the under hood fuse panel had been loosened by a minor service tech. He thought that was how the cover came off. He had inadvertently disconnected the electrical connector under the fuse box. Tighten...
2005 Chevrolet Aveo LT 1.6L MIL Lamp on, Highway shifting VIN: KL1TG2605B
After 4 time relearning the crank this car is running fine. Thanks to the GM tech in Florida (sorry I cant remember his name) He informed me of the correct procedure for this car. Thank you all. Trouble codes: 0300 (random multiple misfire).
1996 Pontiac Sunfire SE 2.2L No Start VIN: 3G2JB1248T
Thanks for all the great ideas and support and sorry for the delay in closing this fix. The Pontiac has finally left and the customer is happy to have his car back. Things got caught up a bit and allowed me some less pressured time to sort this out. I had put ... Trouble codes: P1601 (Loss of serial communication).
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