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Prev Professional Automotive Repair Technical Discussions for December 3, 2010
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Open Help Requests for GM
Help Request Answers
1976 Cadillac Eldorado 8.2L Mechanical
Just did a rebulid on this 500. Assembled and fired it up on the ground before installing it into the car, ran great. After installing it drove less than a mile loud clunk and loss of oil pressure. Immediate shut down and tow in. Pulled distributor no visual p...
1993 Chevrolet Cavalier RS 2.2L Starting VIN: 1G1JC8443P
Help???. This car has had 6 different starters in the last 3 years starting in 6/07,8/07,3/08,8/08,10/08,5/10,6/10 and today. The last one, was of different brand.Came in today starter grinding check flywheel ok , battery checks ok,trying another starter.My qu...
1996 Chevrolet S10 4.3L No Start VIN: 1GCCS19W0T
This vehicle exhibit hard/long crank start below 55F. Once it start it will run the whole day with no problem. Verified when we had the vehicle set overnight and started first thing in the morning. Cranking fuel pressure is at 64psi. Dealership already replace...
2000 Chevrolet Silverado 1500 LS 5.3L Transfer Case, VIN: 1GCEK14T9Y
Ok this is my personal truck and would like some help, All of a sudden it started with this virbation. Virbation got so bad it cracked the transmission adpater where the t case bolts up, Replaced it twice, Now i have prevented it from breaking now it just alwa...
2001 Chevrolet Blazer LS 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDT13W11
Has intermittent code runs good until engine lamp comes on. By the time the customer brings me the car its running good. Trouble codes: 335 (Crank sensor circuit)
2001 Chevrolet Silverado 1500 5.3L loud grinding noise VIN: 1ZGCEK19T7
in 30 years of wrenching i have never heard a loud grinding noise like this. It makes a loud grinding noise sounds like its underneath in the middle or backend of truck. the noise only last for a second or to when it does it. it only makes the noise when the t...
2004 Chevrolet Avalanche 1500 5.3L Harmonic Balancer VIN: 3GNEC13T22
Removed harmonic balancer on vehicle to replace front seal. Upon installation of balancer, realized my pulley instal kit (Mac Master Kit) will not fit crankshaft bore and/or length to re-install balancer. Checked Alldata and of course there is a special J-Tool...
2004 Chevrolet Silverado 2500 LT 6.0L Ext. Mirrors VIN: 1GCGK23U14
I know the telescoping mirrors(oem ones) will not fold in like the original factory ones did but heres my issue. Whenever i put the key in the ignition both out side mirror glass start to move (not all the way) they will tilt or move but not allways in the sam...
2006 Chevrolet Silverado 3500 LS 6.6L Electronic VIN: 1GBJK34D86
Need some help with someone experienced with Allison transmissions. This vehicle is a cab and chassis ambulance. It set the mentioned codes with a SES light upon starting cold. Freeze frame on the Tech 2 scanner tells the codes set when it was 20 deg after 30 ...
2006 Chevrolet Trailblazer LT 4.2L Cuts out, Stall VIN: 1GNDS13S66
Truck started doing this all of a sudden, driving and the check engine light would come on and engine would quit running, coasting sometimes the engine would start to run again with out having to turn the key, if it doesn't restart on it's own it will start ri...
2008 Chevrolet Uplander 3.9L harsh shifting ,MIL lamp on VIN: 1GBDV13178
hey everyone , we have this vehicle that came in customer stated that it has hard shifts from 1-2 and 2-3 we scanned the vehicle and found a code P0717 which is input speed sensor signal missing ,, we went ahead and replaced the input speed sensor and ran into...
2001 GMC Sierra 1500 SL 5.3L No Start VIN: 2GTEK19T01
Afternoon all have a intermitten no start cranks ok. go to start it up in the morning to pull it out of the shop may start may not get it started shut it off may restart may not. Same for the afternoon. scoped crank and cam sensors both have a nice square wave...
2005 Pontiac Grand Prix GT 3.8L No Start, Stall VIN: 2G2WP52255
Car will stall intermittently with no warning and message center will flash "starting disabled due to electronic throttle control". Car will then crank with no start. Let it sit for a while and the cycle repeats. Sometimes it set codes for both O2 sensor heate... Trouble codes: U0107 (Lost communication with throttle control), P0601 (Control module ROM malfunction), P0606

Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick Regal GS 3.8L Starter, DRL, OD VIN: 2GAWF52L3X
Overwhelmingly everyone was saying ignition switch so I checked voltage at the BCM fuse with the key on and BAMMM! only 4.5volts replaced the switch and all is well. Those were some very strange symtoms. Thanks everybody
2000 Chevrolet Silverado 2500 6.0L 4wd VIN: 1GCGK29U1Y
Well it turned out to be the TCCM. Soon as I plugged it in, truck went into 4wd on request with no problems what so ever. Figured I would put his old actuator back in to make sure it actually worked and sure enough... it didnt. The actuator barley moves compar...
2006 Chevrolet Avalanche 1500 LT 5.3L Hesitation, MIL Lamp on VIN: 3GNEK12Z76
thanks for all the replies. I reconnected the PCM the next morning and could not recreate the problem. I did check G103 & G104 prior to disconnecting the PCM to check the harrness. All were solid grounds. There were no misfires or any reduction in power while ... Trouble codes: P0107 (Map/baro sensor low voltage), P0068 (Airflow performance).
2010 Chevrolet tahoe 5.3L power windows bcm VIN: 1GNUKAE06A
Thanks for the replies I found that I blew all BCM fuses 2 were those box fuses that you can't tell they are blown there was a 60 and 40amp fuses blown Thanks again for all the help
1999 Pontiac Montana 3.4L abs VIN: 1GMDX03E2X
I am going to call this a fix because I know what is wrong with it even though the customer pulled the vehicle. They bought something else while we were pulling our hair out trying to fix it for them. I was able to reproduce the pedal drop that the custom...
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