iATN Member GM Auto Repair Tech Exchange for June 17, 2008

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Open Help Requests for GM

	Help Request	Answers
	1993 Buick LeSabre 3.8L compressor clutch Vehicle came in about 2 months ago with flashing display, no clutch engagement. I didn't pull codes since I know ususally refrigerant codes cause flashing and no clutch engagement, I disconnected the battery, reconnected battery, compressor came back to life, ...	View
	1995 Buick Riviera 3.8L Starter Vehicle came to shop with upper steering column broken so bad that it was decided to replace with a used column. Used column did not have the radio tune buttons in steering wheel so ignition switch and all harness were transferred from one to the other includi...	View
	1993 Cadillac Fleetwood 5.7L automatic hvac i'm helping a disabled neighbor get his a/c working,with all kins of head aches.after mechanical repairs completed, i turned on the a/c the blower worked for about two minutes. i checked the blower motor for voltage zero.i replaced the power module i now have ...	View
	1993 Chevrolet Corvette 5.7L engine vehicle came in for overheating,after warmed up would blow out of the resevoir. checked for head gasket leaking found headgasket leaking compression, replaced head gasket and found heads warped had heads machined. after repair still does overheat, runs good an...	View
	2000 Chevrolet C6500 7.4L ebcm No communication with scan tool. Found corroded and broken wires going into the ABS module under the vehicle, Repaired wiring to the ABS module. Codes: C0241, C0242, C0245, C0246, C0251, C0252, C0255, C0256, C0265, C0267, and C0281. Codes C0241 - C0252 are EBC...	View
	2000 Chevrolet Monte Carlo 3.8L Stall Ok so I need to repost this as customer droped this off again complaining of intermittant stall.I have only confirmed this condition three times last week but that was before crank sensor and ICM replacement.I have checked for codes in ALL modules none found (...	View
	2004 Chevrolet Corvette 5.7L Sensor we put 4 new wheels (08 Corvette Chrome wheels) on this car. had to move all sensors to new wheels, we have done this many times, never a problem. after the job was complete signal appears on dash left rear tire flat. we took it apart, looked at the sensor (lo...	View
	2004 Chevrolet Aveo 1.6L MIL Lamp on thanks for any and all help on this one. orginially came in with po300 and po1781. changed plugs and wires. no help, can find no intermitten miss. tested po1781 tcm sending engine speed info to pcm false. test called for checking voltage on c.a.n system from p... Trouble codes: PO300 (intermitten misfire), PO700 (tcm set code thru pcm), PO700PD (na), PO1781 (tcm comm to bcm about engine speed malfunction).	View
	1996 GMC gmc 5.7L a.c. G.M. Techs your knowledge is needed.Bus came in with bad compressor.Replaced it along with new receiver drier and orfice tube,replaced rear expansion valve, flushed entire system even subletted big condensor for radiator shop to flush.At idle will not cool,spr...	View
	1997 Pontiac Grand Am 2.4L No Start I have a crank no start that was towed in from our detail department down the street, it suppossiably ran when it left. The ignition module and coils were replaced by another tech. The fuel pump and filter were replaced also by another tech. Vehical will crank...	View
	2002 Pontiac Bonneville 3.8L Stall Hello I have this 2000 Bonneville that stalls intermittently when coming to a stop like the key was turned of. It might stall 3 times one day and the next it will run fine. When it stalls it starts right back up and idles fine. It will do it cold or hot. Ther...	View
	2005 Pontiac Vibe 1.8L MIL Lamp on HELP! AFTER NEW COMPUTER: Client drove for 70miles when Code P0012 - Camshaft Position "A" Timing Over-Retarded BANK 1 We began by clearing codes & double checking part # options, checking for TSBs, RECALLs, Iatn, Circuit testing, consulting w/ACDelco part... Trouble codes: P0012 (Camshaft Position A Timing Over-Retarded Bank 1).	View
	1998 Saturn SC2 1.9L piston rings Saturn 1.9 piston oil-ring/oil consumption ! Nothing new to most folks out there. Ive spent hrs reading and researching this issue. My Question is: a few have mentioned in posts/replies that the 'original' pistons can be modified by drilling holes of a certain...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1999 Buick Regal 3.8L Cuts out As most replies suggested, an ignition switch cured this problem. How the left turn signal affected a cut out / no start through the ignition switch I will never know, but electricity can do some wierd things. God bless all who took the time to read & reply....	18
	1995 Chevrolet Pickup 5.7L Cuts out Thank to Tom in St Paul suggesting checking air inlet which I did the first day and found nothing. He suggested unhook maf sensor to put in limp mood and doing so I drove the p/u with no air cleaner on and ran perfect. I stopped hooked up maf and it still ran ...	5
	2000 Chevrolet Suburban 5.3L No Start Thank you for all of the great suggestions. First off, the problem with this troubled suburban was a faulty ECM. I was looking pretty hard at the ECM to begin with and posted this help request just to get some reassurance before I replaced the ECM. I got a wid...	8
	2000 Chevrolet Monte Carlo 3.8L Stall Thanks for all your input on this one however after replacing the crank sensor,icm,iac, trying a known good ign. switch and checking /pulling on all wiring harnesses customer is still complaining of an intermitant stall.the only thing I just noticed on scan to...	32
	2004 Chevrolet Silverado 6.6L 5th gear I was waiting for the customer to have some time to drive this vehicle before I said it was fixed. He's had it for 2 weeks and when I called him this morning he said that it hadn't acted up once. There never really was a smoking gun on this thing. We did find ...	4
	2000 Oldsmobile Intrigue 3.5L temp guage Thanks to all! The TSB Thermostat did the trick! would be nice to think the aftermarket should know that, we replaced it 2x's before! Looks like a lesson learned, oem from now on!	7
	1997 Pontiac Grand Am 2.4L Cuts out, MIL Lamp on Thanks to everyone for taking the time to reply to my request.When I replaced the coil housing I noticed it had one aftermarket coil.Thinking back,once I had a 3.8 that wouldn't start and only had spark on one coil.Replacing the coil that had spark was the fix... Trouble codes: P0335 (Crank Shaft Position Sensor Circuit).	11

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