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Prev Professional Automotive Repair Technical Discussions for December 6, 2012
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Open Help Requests for GM
Help Request Answers
2001 AM General Hummer 6.5L No Start VIN: 137ZA843X1
I have this H1 Hummer in the shop.(I am not a diesel mechanic, but the owner insists I work on it.) It is a good customer with money and a lot of vehicles. He seldom drives any of them very much. Yes this eleven year old Hummer has less than ten thousand miles...
1997 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP52K9V
Vehicle came back with the same code, po440.., went through the hoops again.., no leaks.., and caister valve is grounded at all times again. I know this is limited information.., but i know how majority of evap systems function., i know when purge occurs, ther... Trouble codes: P0440
1996 Chevrolet Blazer 4.3L no 3rd or 4th gear VIN: 1GNDT13W5T
PLEASE HELP, This one is a tuffy. Have this 96 s10 blazer with a 4l60e trans. Came in with no 3-4 gears. Scanned vehicle, no tranny codes. Had one code for egr pintle position fault. Checked trans fluid, burnt bad. customer wanted to fix only what was needed t...
2000 Chevrolet K3500 7.4L Fuel guage VIN: 1GBJK34J9Y
We are looking for some help on this fuel gauge problem.Resistance doesn't match specs,but a new fuel doesn't match either.(both senders match each other)Gauge always reads full but the wiring seems to go through the pcm.Looking at a new pcm,but don't want to ...
2001 Chevrolet Astro LS 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDM19W81
This post is for a friend. There is a misfire on cylinder #4 @ about 1500 r.p.m. & under a load. Cylinder #2 also has some misfires, but #4 is the greatest. The problem was already there before any of the above work was done, but nothing seems to fix it. Look... Trouble codes: P0300 (Engine Misfire)
2005 Chevrolet Impala 3.4L MIL Lamp on VIN: 2G1WF52E75
This Impala has an engine noise that is picked up by the knock sensor and cutting the power back for the last several months. Customer has unplugged the sensor and drove, the noise has not increased or decreased. Is there a way to fool pcm and cut the check en...
2006 Chevrolet Silverado 2500 HD LT 6.6L Excessive Emissions, No Start, Stall VIN: 1GCHK29D36
The customer drove the vehicle to the shop. Excessive grey smoke from tail pipe, no throttle response and vehicle would only go 5 miles per hour. After the customer turned the vehicle off the engine would only fire and shut itself back off. Pushed the vehicle ...
2007 Chevrolet Tahoe LTZ 5.3L Radio, power nengine VIN: 1GNFK13077
We have this 2007 Chev. Tahoe and the customer states that at times the radio will cut out while driving. Generally after about 20 miles or so. He also said that once in a while the engine will "hiccup" but not die, along with the radios failure. Then all will...
2005 GMC Yukon XL 1500 Denali 6.0L Passenger side air temperature VIN: 1GKFK66U45
This is a message for G.M. techs. This vehicle and my own 2001 Suburban have the same problem. In the winter when driving on the highway, there is a cold air draft from behind the glovebox and maybe around the hvac case. I put this under the a/c section, but i...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Chevrolet Corvette 5.7L Poor Idle Quality VIN: 1G1YY23P4N
bad part from the box. went with an MSD unit and all is well. thanks for the help
2001 Chevrolet Suburban 1500 LS 5.3L Cruise Control VIN: 1GNEC16T71
A huge thank you to everyone who responded with help. Nick and Dan nailed it. I checked the brake light bulbs and sure enough someone installed LED bulbs. We replaced them with regular bulbs and the cruse control works now. Also the second brake PID now respon...
2003 Chevrolet Suburban 1500 LS 5.3L engine
Thanks for all the replies.The majority of you pointed me in the direction of the cam and lifters which turned out to be the fix.Thanks to you I didn't pull the transmission to look for a cracked flywheel.
2003 GMC Sierra 1500 SLE 5.3L Transfercase VIN: 2GTEK19TX3
Thanks gents for the replies. We had the transfercase out so we took it to my friend at the Automatic Transmission Shop and had him look at it. He took it all apart cleaned and shimmed something. But the actual repair was in the encoder motor. There is a littl...
2007 Hummer H3 3.7L Transfer Case VIN: 5GTDN13E67
No one really responded, so guess I'll have to tell ya what I found. I found that removing the Shift Motor I could rotate the shift shaft, and it just did not feel right. If I had the transfer case engaged, and went clockwise and then back to were I started, t...
1999 Saturn SL2 1.9L secondary air system VIN: 1G8ZK5279X
Thanks everyone, the air tube to the manifold was partially plugged. Pretty close to plugging solid. I cleaned it and blew air through the manifold and it seemed to be flowing ok so I reassembled and tried it. The O2 sensor switched much faster and the fuel tr...
2004 Saturn Vue Red Line 3.5L transmission VIN: 5GZCZ63444
Thanks for all of the replies and help. I decided to go with lifting the vehicle off the cradle with engine and trans. still attached. It took 3hrs to get to that point so not too bad. There wasn't that much wiring harness to disconnect. The radiator and conde...
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