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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 26, 2009
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Open Help Requests for GM
Help Request Answers
1990 Buick Electra Park Avenue 3.8L auto temp control VIN: 1G4CW54C3L
this is a auto temp control system. customer came in with no blower motor. tested blower motor to find it was burnt up. replaced motor ran for about 2 min, and quit. tested again and found it was fine. replaced blower modual and everything worked fine. lasted ...
1999 Cadillac DeVille 4.6L No Start VIN: 1G6KD54Y1X
cleared on board pcm , leftign on for hour, . key recoded . yet no code to run injector pulse . security code is coming up. vechile will start with starting fluid.
1991 Chevrolet Corvette 5.7L ignition VIN: 8XM5112742
I am posting for a friend of mine. The vehicle is not in my shop yet. The vehicle starts runs then shuts off. Fuel pressure is at 41psi. Tank is full. Similar post in knowledge base back in 2004 by Tim Jervis from Kentucky, if you read this what was your fix? ...
1993 Chevrolet C2500 Silverado 5.7L Excessive Emissions, Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 1GCGC29K2P
checking this vehicle out i found the engine vacuum will drop way low to 5 inchs hg and thin jump back up when this happens the data list shows the ecm is driving engine way lean the intergrator is showing under 90 and been as low as 70 and block learn is show... Trouble codes: 45 (rich exhaust)
1996 Chevrolet Lumina 3.1L no upshift VIN: 2G1WL52M7T
I am not a tranny guy but need help with this one.It is my g/f car and wont shift to 3-4. I dropped the pan and there is 3 lines.One has a rubber hose on it that was junk.My question is the tube that goes to the rear of trans where the 3 lines go in, dont it h...
1997 Chevrolet Blazer 4.3L Misfire, spark knock VIN: 1GNDT13W4V
The customer complaint is the check engine light flashing over 50 mph. Using a Tech2 the misfire graph is showing a slight misfire on all cylinders at all times while driving, over 50 mph #2 cylinder goes off the screen. I pulled #2 plug to look at it and the ... Trouble codes: P0300
1998 Chevrolet Tahoe 5.7L transfer case VIN: 3GNEK18RXW
I have this Tahoe that very intermitantly will go into neutral, has happened at 10mph and 60mph, at the same time speedo will drop to "0". The one time I was able to duplicate it went into neutral at 50mph speedo droped and would bounce up occasionaly coasted ...
1999 Chevrolet Malibu 3.1L No Brakes VIN: 1G1ND52M1X
Figured this was a bad master. Decided to replace pads at same time. Pushed piston back into calipers and see brake fluid leak where there should not be a leak. Removed fender well cover and find ABS unit covered in battery acid on the sides I can see from the...
2003 Chevrolet Impala 3.8L traction control VIN: 2G1WH52KX3
just got this impala in to sell. the "traction active" lights up when starting off. this happens mostlt when backing up slowly in reverse. no codes or abs on. i seem to remember a problem with the wire harness's on these cars. not sure if this is the problem a...
2004 Chevrolet Impala 3.4L Ducting VIN: 2G1WF52E54
Hi there, This one came in after the owner had tried his hand at repairs, to no avail. The problem is the heat is only coming out of the vents on the left side of the car. The air coming out of the right side is cold. I've checked the operation of the duct w...
2005 Chevrolet Uplander LS 3.5L abs VIN: 1GNDV23L55
I have this vehicle that the abs light illuminates and the message center says service abs system and service brake system. The only code in the system is C0281 Dynamic rear proportion valve performance. Mitchell has little info on the code. I have searched th...
2006 Chevrolet Trailblazer LS 4.2L door locks VIN: 1GNDS13S46
hi all you GM techs, this truck came in with door locks not working from the key fob,and the lift gate lock would pulse when it was open. did diagnostics from mitchell,found bcm bad, replaced AND programed new bcm w/ tech 2 now door locks work intermittently f...
1999 GMC Sierra 2500 SL 6.0L Poor Idle Quality, Stall VIN: 1GTFC29U4X
truck towed in,would not run. i tried to start it ,ran very low rpm feathered the throttle it stalled. tested fuel pressure ,was at spec. scaned for dtc had o2 and evap codes. scaned pids saw nothing jump out at me.unpluged maf truck started and ran,had good t...
1995 Oldsmobile Silhouette 3.8L Cuts out, Stall, MIL Lamp on VIN: 1GHDU06L2S
Customer complaint of an engine stall sometimes. Brought to my shop where we spent about two weeks trying to get it to stall befor diving into the codes that were stored. Never got it to stall long enought to check anything so we tried to check out the codes. ... Trouble codes: P1640 (qdm 1 failure), P1670 (qdm 4 failurre), P1406 (egr pintle position circuit)
2006 Pontiac Montana SV6 3.5L chime VIN: 1GMDV33L56
the chime warning wont turn off. when the vehicle idles its off but as soon as the gear shift is put in drive the chime stays on. all of the door switches show to be working on the scanner. the seat belt symbol goes off when the seat belt is fastened. there ar...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Skylark Custom 2.4L Poor Idle Quality, Misfire VIN: 1GNJ52T2VC
Hello everyone, Sorry it has taken so long to close, but I was so happy I found the problem I forgot to close this out... I found the new timing gear set from NAPA was made a 1/2 toothe off on the crank gear. replace with new gear and was repaired... Trouble codes: P0300.
1994 Chevrolet C3500 6.5L no gears VIN: 1GND43L56W
I wanna thank everybody for responding to my problem.especially william from washington it turned out to be two burnt out shift solenoid c and b.He took it to allison trans and they fixed it.They have a special scanner just for that.So thanks again!
1995 Chevrolet Corsica 2.2L Excessive Emissions, MIL Lamp on, VIN: 1G1LD5542S
Replaced the number 1 injector, o2 Sensor, and for the most part the car runs well. Its still a little on the rich side, and one of my test drive yielded a QDM driver B failure again. Customer doesnt want to put any more money in it and have decided to take it... Trouble codes: 45 (Exhaust Rich).
1996 Chevrolet K1500 Cheyenne 5.7L Tach speedo shift inicator VIN: 2GCEK19M9T
Well this one is fixed. Don't know why I didn't see this right away, there is one thing that these three have in common. I was looking over the wiring diagram and found that there is a pink wire going to pin 7 at the cluster, I had current at the fuse but not ...
2002 Chevrolet Impala 3.4L starter,interior lights,radio
Sorry it took so long to close but after three weeks vehicle has not acted up. Alot of replies pointed towards bcm or bcm connectors. If customer gets back to me I will post results. THANK YOU FOR THE HELP.
1993 GMC Safari 4.3L No Start, Surge, Cuts out, Stall VIN: 1GKDM19W81
Thank you everyone for great replies. I tryed all of them. We ended up replacing the cpi fuel injector, and it cured the intermittant stalling/hard starting. Wierd huh? That was one expensive fuel injector.
2002 Pontiac Grand Am SE 2.2L engine VIN: 1G2NE52FO2
thanks for the replies, found the crank sensor behind the starter like everyone said and replaced it. haven't herd from the customer in a week so i think this one is in the record books. thanks again for the info.
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