GM Automotive Technicians Technical Discussion and Fixes for Nov 8, 2012 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1992 Buick LeSabre Limited 3.8L No Start VIN: 1G4HR53L1N Car came in no start-tested fuel pressure 30 lbs-no injector pulse-no spark.I tried a crank sensor & ignition module. Same promlem,I also checked all the fuses.Help,thanks,Bill [...]	View
	1992 Buick Century Custom 3.3L Poor Idle Quality, Cuts out, Stall customer went into store, came out and car wouldnt start. car eventually started but customer had it towed in to be safe. i go start car, misfire noticable at idle and while driving car into service bay. first thing i did was look at plugs and wires. 3 diff m...	View
	2002 Buick LeSabre Limited 3.8L No Start VIN: 1G4HR54K42 Replaced mass air flow with a delco unit. Will only do it hot, after a drive. All pids and fuel pressure ok. Will not do it on a cooler day, In the summer did it almost everyday. Will have to depress the acc pedal to start. Will blow black smoke for a second o... Trouble codes: P0101	View
	2008 Buick LaCrosse CXL 3.8L steering VIN: 2G4WD58218 When cold it makes what i believe is a power steering noise- like its low on fluid, goes away shortly after you start it and is full of fluid. Have not seen any issues with these especially at 61xxx miles. Is there any thing i should watch out for or check bef...	View
	2005 Cadillac DeVille 4.6L Mechanical VIN: 1G6KD54Y25 I have to pull the engine so the machine shop can install head studs. the engine is leaking coolant into # 2 cylinder. what i was wondering is if anybody has pulled the engine out the top instead of out the bottom. just a thought that it might be easier out th...	View
	1993 Chevrolet Corsica LT 3.1L Stall VIN: 1G1LT53T5P This one is strange,after warmed up engine will start and run until you start to roll then dies. I verified that it is vss related,with tires off ground in nuetral if you slowly rotate a front tire it stalls. Dissconnect the vss at trans and all is well. I don...	View
	2002 Chevrolet Silverado 2500 HD 6.6L monitor not running VIN: 1GCHK23172 there was a p0401 egr code and a p0380,glow plugs.I cleaned the maf and so far replaced 4 glow plugs drivers side.The egr monitor is not running.I hope someone can give me heads up on the enableing criteria.I used to work at G.M. but no longer have the S.I. av...	View
	2006 Chevrolet HHR LT 2.2L steering light VIN: 3GNDA23D16 Hello to all. We have this HHR problem. Customer states that at times the gauges will be erratic and steering light will illuminate with audible ding heard. Will sometimes stay that way for a minute but usually will go right away. I have scanned and the only m... Trouble codes: U2107 (Lost communication with BCM), U2103 (Fewer controllers on than programmed)	View
	2006 Chevrolet Silverado 2500 HD LT 6.6L door locks,radio VIN: 1GCHK23D86 Thanks to all who reply. Door locks will unlock by themselves at all times sitting still,driving,truck running or not. Appears more frequent when temps are cooler, and less as temps warm up. This is main concern.Radio when driving will shut off and show locked...	View
	2007 Chevrolet Avalanche LTZ 5.3L Poor Idle Quality VIN: 3GNEC12087 After active valve lifter replacement(battery disconnected), high idle speed in p/n. If placed in gear idle speed will slowly drop to normal. If placed in p/n idle will remain normal until throttle is depressed. It will then go to 2000 rpm. When this occurrs, ... Trouble codes: P0507	View
	2006 Hummer H3 3.5L fuel injectors VIN: 5GTDN13626 Vehicle will fire once but not start. Only cylinder #5 is getting fuel. We have reset the anti-theft system but get an inconsistent theft light on the dash. Sometimes it stays on, and sometimes it goes out. Have checked all grounds and electrical plugs for ben...	View
	2000 Saturn SL2 1.9L Mechanical VIN: 1G8ZJ5277Y Hello, I need some input, we rebuilt the engine in this Saturn and seem to be having starting issues. It cranks fine as soon as you try to start the engine it backfires out the intake with fuel included? I am out of ideas. I ran a leak down and have checked th...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Cadillac Seville STS 4.6L MIL Lamp on VIN: 1G6KY5292S The customer decided not to repair this vehicle. The state of California offered him $1500 to retire it. He took the $$ and ran. Can't blame him on this one. This car also had the infamous upper Crank case oil leak. Thank you all again, IATN rocks! Trouble codes: 80 (Position Sensor TPS and idle relearn).	5
	1997 Cadillac Seville SLS 4.6L dashboad illumination The winner is Juan. Thanks to Juan,Avinash and Raymond for taking the time to respond. And thanks to everyone who took their time to read my post. It was the twilight sensor. When I was testing the value of the sensor in the scanner it was 120 counts dark and ...	3
	1993 GMC Yukon 5.7L driveline VIN: 1GKEK18K8P Well I ended up replacing the mode slider the teeth where rounded off enough to cause problems.595.00 to fix t-case,bearings in front axle,rear shaft u-joint and rt. front cv axle and I was told that was to much what a joke ,thats what you get for cutting som...	7
	1999 GMC C3500 Sierra SL 6.5L Clutch, hydraulics VIN: 1GDKC34F9X Thanks for all of the replies!! It indeed was a pilot bearing failure as several of you suggested, installed new clutch kit, resurfaced flywheel, re-assembled, and all is well. Thanks again to the IATN group!!	16
	2008 GMC Acadia SLT 3.6L ves VIN: 1GKEV33748 Ok, changed the pump with a new delco, fixed it right up. thank you for taking the time.	3
	2002 Oldsmobile Alero GX 2.2L Timing Chain VIN: 1G3NK52F72 Thanks to all who replied to my request. I have replaced both chains, guides and a new tensioner. Most agreed that a new chain was needed with the tensioner, specifically from o.e. I have contacted the manufacturer help line of the tensioner. I was told th...	5
	1993 Pontiac Grand Prix LE 3.1L Starting VIN: 1G2WH54T2P I found the wireing harness to crank position harness had rubbed next to oil pan causing a small short in wiring. hence causing a driver to go bad in the ECU after repairing the harness and replacing the ECU and crank postion sensor all is well. Thank you for ...	14
	2003 Pontiac Grand Prix GT 3.8L Blend Doors VIN: 1G2WP52K23 So this car is fixed. Funny thing is that I'm not sure what fixed it. First, thanks to all of you who responded. 13 replies in 24 hours is great, and they were all helpful. I convinced the customer to approve removal of the heater core, which isn't a bad...	16

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