GM Automotive Technicians Technical Discussion and Fixes for Aug 30, 2013 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2004 Buick Rendezvous CX 3.4L Cuts out VIN: 3G5DB03E54 Vehicle will lack in power when accel,mainly above 2500 rpm, replaced maf sensor ran good for a week,no codes,removed exhaust no better,checked wiring to pcm and ignition module they all look good.when it acts up it just falls on its face almost like plugged f...	View
	1989 Chevrolet C3500 Cheyenne 7.4L Excessive Emissions, Cuts out, MIL Lamp on VIN: 2GCHC39N7K the truck seats at idle and runs lean according to the o2 sensor. check engine light comes on. running at 2500 hundred it runs like its cutting out. the injectors both have a cutting out reaction. (pretty sure thats a effect not a cause. Trouble codes: 44 (oxygen sensor lean), 45 (oxygen sensor rich)	View
	1995 Chevrolet K2500 Cheyenne 7.4L Rear drum brakes VIN: 1GCGK24N5S This truck came in with complaint that rear brakes are not working, lifted on hoist and confirmed, engine at idle will still spin rear brakes, can push pedal as hard as possible and still do not stop, can tell that is trying to stop wheels but is like proporti...	View
	1995 Chevrolet Corvette 5.7L oil leak VIN: 1G1YY22P1S This is one for the Corvette guru's, car came for oil leaks (lots), we replace valve cover gaskets and intake gaskets, all good there now but still leaks from front. We found the water pump drive seal leaking, replaced it 2 times but still leaks, removed timin...	View
	1997 Chevrolet K2500 Cheyenne 5.7L Fuel VIN: 1GCGK24R2V Hey guys, this is a fleet truck it has had multiple fuel pumps and relays. We had to re-wire relay outside of fuse box because the connectors were kinda burnt up. This time the truck wouldn't start I wiggled the wires for the relay and when truck started the w...	View
	2009 Chevrolet HHR LT 2.2L Bcm VIN: 3GNCA23B49 I have a vehicle that I have purchased a BCM to repair AC inop part was purchased thru GM Parts dept but the service dept is telling me that it doesnt need to be programmed thru the dealership rather just activated through a tech 2 or snap on scanner. to this ...	View
	2010 Chevrolet Silverado 2500 HD LT 6.0L hvac controler VIN: 1GC4KXBG6A Ac works and then with no warning goes to full hot, you can move the hvac control knobs, the temp or mode knob and it will start back to cold air, I have recalibrated the mode doors with tech 2 and found history codes Bo423 02 and b3779 02. I cleared the histo...	View
	2004 GMC Sierra 2500 SLE 6.0L Misfire VIN: 1GTHK23U04 Came in with a P0300. checked it with the tech2 and ended up changing the MAF(gm part) changed spark plugs and wire set ac/delco. Still had a P0300 with all the misfires on the left side of the motor. Changed the wire harness to the coil pack on the left side....	View
	2005 GMC Sierra 1500 SLE 5.3L Keyless Entr VIN: 2GTEC19T15 Good afternoon everyone. I would greatly appreciate any help or info with this problem. Truck belongs to a regular customer, one day he noticed his fob didn’t work. He changed batteries, tired his spare key fob. I tried re programming his old key fobs, I als...	View
	1996 Pontiac Grand Prix GTP 3.4L Stall VIN: 1G2WJ12X1T VEHICLE DOES NOT STALL WHEN COLD ONLY AFTER WARM UP OR AT TEST DRIVE, while test driving stalls at idle at every stop but if idle is held up to 1500 rpm does not stall, vehicle start back straight away on neutral or park.Please any suggestion really appreciate...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2004 Buick LeSabre Limited 3.8L electric windows VIN: 1G4HR54K94 My sincere thanks for the help and advise on this Buick. The "fix" was the left door module. Not sure it's a good clue, but when we sacnned it, the door mudule looked like it was stuck in the "down mode". We did test the power circuit from module to rear fuse ...	10
	1996 Chevrolet Corvette 5.7L abs VIN: 1G1YY22P1T While this vehicle is not fixed I do believe the module is still the cure. The reason behind this thought is the fact that each module stored a different code than the original faulty module. To make this problem worse the only modules available are used and u...	6
	2005 GMC Sierra 2500 HD SLE 8.1L timing chain VIN: 1GTHK23G95 as a lot of you replied this is normal for the 8100 engines. i degreed the cam and the 1/4" slack equals 1 degree of cam movement/2 degrees of crank movement. i have pictures posted on the tech discussion forum of the measured slack and this seems to be normal...	7
	2006 Hummer H3 3.5L No Start VIN: 5GTDN13696 I will call this vehicle fixed. With recommendation from Chris [...] I replaced the ign. lock housing. I also replaced the ignition lock solenoid becuse it was extremely hot while the ign. key was on. The parts were AC Delco#D1462G and [...]. I think t...	7
	1990 Oldsmobile 98 Regency 3.8L Stall VIN: 1G3CX54C8L well thanks million everyone ecm was problem.let it idle an hour and drive so far so good. thanks again	26
	2000 Saturn SL2 1.9L SIR, BCM module VIN: 1G8ZK5275Y Saturn 1, Mike 0. The agony of defeat. I tried disconnecting the ipc and sir; no change. There is no set up in Tech 2 for air bag/bcm acknowledgement. My mistakes? Well I tried to program without obtaining a VCI; but there are no instructions indicating that a...	9

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