GM Automotive Technicians Technical Discussion and Fixes for Nov 21, 2007 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2004 Buick Rainier CXL 4.2L Rear differential VIN: 5GADT13S94 Good day all, I have this 2004 rainer came in with rear end clunking when turning. Changed fluid. No better. Replaced rear differential carrier with new GM unit. Used GM syn gear oil. When turning at parking lot speeds the clutches wont let go. If you speed up...	View
	1994 Cadillac Fleetwood 5.7L A/C & Radio VIN: IG6DW52P9R I have this 1994 Fleetwood in the shop for lights staying on in The A/c controll head and radio. The A/C works great and so does the radio.Just the display will not shut off with key off or light switch turned off.I cant seem to find anything wrong with twilig...	View
	1982 Chevrolet Corvette 5.7L Hesitation, Cuts out, Stall, Misfire VIN: 8XC5119424 Thanks in advance! This car has become a thorn in my side. We have replaced everything that could make one do this. (see repair history)Everytime the pedal is mashed the right side throttle body spits back and backfires. After 2 pcm's and a number of sensors I...	View
	1995 Chevrolet K2500 Cheyenne 6.5L hard start VIN: 1GCGK24F8S This truck is very hard to start first thing in morning or after sitting all day.It will crank great and act like it wants to start but will not until it is ready, then it will start and run like nothing is wrong. Everything that we have tested seems to be goo... Trouble codes: 29 (Glow plug relay fault), 34 (injection timing stepper motor), 65 (accell.pedal position circuit range)	View
	1995 Chevrolet C2500 Cheyenne 6.5L Stall VIN: 2GCFC29S0S this vehicle always stays running everytime i see it but stalls on the customer all the time hot or cold, doesnt seem to matter but he says it always starts back up right away sometimes it will be fine for a day or two	View
	1995 Chevrolet Tahoe LS 5.7L Hesitation, Cuts out, Misfire VIN: 1GNEK13K1S Problem: Cuts out on medium to heavy load, has new cap rotor,wires,plugs,module and pick-up coil.Compresssion 140 -150 on all cyls. Scan'd - no codes, Check"d fuel pressure - 28 pounds, check'd for resriction's in lines and t-body none!. Tried new fuel pressur...	View
	1995 Chevrolet Blazer 4.3L No Start, Hesitation, Surge, Cuts out, Stall, intermittent no star VIN: 1GNDT13W2S Customer states that engine ran fine then, one day, stalled out and needed a tow. We started the engine on propane, removed the propane and it idled fine but would not rev and would cut out and eventually stall. We noticed that the fuel pressure was a bit low ...	View
	1996 Chevrolet Express 3500 5.7L No Start, Poor Idle Quality, Cuts out, Stall, 40,000 IAC COUNTS VIN: 1GCGG35K0T hello , today i have a 96 g3500 van tbi injection i have tuned up , changed evry sensor on it and stiil cannot get it to run right . it is hard to start . no throttle response stall when you put in gear , you can smell raw fuel at exhaust when idling . when lo...	View
	2000 Chevrolet Silverado 1500 5.3L Blend door VIN: 1GCEK19T9Y Customer complaint, no cold air, hot air always coming out of vents. mode doors work properly, checked a/c performance, good. Disconnected actuator from blend door, does not change when activated using control head. Ohm tested wires from control head to actuat...	View
	2001 Chevrolet Silverado 1500 5.3L belt VIN: 2GCEK19T11 Truck came into shop with a belt squeal all the time, hot or cold. We could not isolate source therefore process of elimination we replaced belt, tensioner, idler, waterpump, and alternator ( embarrasing but still squeals !! )We even replaced all these over ag...	View
	2004 Chevrolet Silverado 2500 6.0L Brake switch VIN: 1GCHK24U14 Thanks for all help in advance. This is my personal vehicle that I purchased from a commercial farm. It was complely full of dirt on the inside. I removed the entire interior and cleaned out the hvac assembly because it was also full of dust and dirt. I now ha...	View
	2004 Chevrolet Silverado 2500 6.0L engine VIN: 1GCHK24U14 This is my personal vehicle that I just purchased from a commercial farm for cheap. It has had a hard life. Anyway before I dive into the engine I want to see if there was any common problems associated with the fact that this engine has a lot of water in the ...	View
	1999 Oldsmobile 88 Royale 3.8L Misfire VIN: 1G3HN52KXX can anyone help car came in for engine miss. scaned for codes po203 and po303. replaced injector #3 with aftermarket injector. left running for about 1 hour not missing drove car started to miss after a few minutes. scaned had same codes.replaced DME performed... Trouble codes: P0203, P0303	View
	2002 Oldsmobile Alero GX 2.2L MIL Lamp on VIN: 1G3NK52F72 need some help from iatn techs. got car kind of late. p0420 had above listed parts prior to this visit checked fuel press. 59psi. smoke tested clean. checked vac. 22/23in map 8 to 10 at idle. no noise from timmig chain. grafed both o2s on modis they almost loo... Trouble codes: P0420	View
	2005 Pontiac G6 GT 3.5L radio VIN: 1G2ZH52805 The radio has a six changer cd unit & a cd is stuck in the unit,displaying an error message. All the cars gauge and data is displayed through the radio. Can this raido be removed from the car to be sent for repair and the car be driven with out any drive abili...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1997 Cadillac DeVille 4.6L headlights VIN: 1G6KD54Y4V We found another burned up relay for the headlights. We tried getting ahold of another relay box, but could not find one. Put in another relay and did some more test. Found the hi/lo beam relay also had some problems, so we replaced that also. This is as far a...	6
	1995 Chevrolet C1500 4.3L Stall VIN: 1GCEC14Z8S Hi techs, thanks for all the replys. The base idle could only be set by IAC counts, if I would try to by-pass aldl connector I would get no response, If I would use my scanner to put it in by-pass the truck would not respond. After further testing on the stal...	10
	2004 Chevrolet Silverado 1500 5.3L Drive-axles VIN: 2GCEK19T34 I realized as I started testing that I was probably not the first or maybe not even the second person to work on this vehicle. Everything had been replaced. When I got the vehicle back it worked perfectly of coarse, however I started checking connections and w...	7
	1999 Pontiac Grand Prix GT 3.8L No Start VIN: 1G2WP52K6X I WANT TO THANK EVERYONE WHO REPLIED.IT WAS THE VOLTAGE TO LOW.BUT IT WAS THE ICM THAT CAUSED IT THE ICM WOULD DROP VOLTAGE WHEN MOUNTED. WHEN THE MODULE BOWED THE SLIGHTIST BIT IT DROPPED VOLTAGE.NEW OEM MODULE AND ALL IS WELL,I STILL DON'T UNDERSTAND WHY I G...	4
	2003 Pontiac Montana 3.4L Cuts out, Misfire, MIL Lamp on VIN: 1GMDU03E13 Well, at this time I'm not sure the vehicle is fixed. I hope to hear some feedback from the customer soon. Thanks techs for your help. I realize from your replies this is a tough one since the problem is intermittent. Even talking to the customer a few days ag...	4

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