GM Automotive Technicians Technical Discussion and Fixes for Jan 28, 2005 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1997 Cadillac Seville STS 4.6L OBDII Monitors VIN: 1G6KY529XV After computer replacement, we are attempting to get all system monitors to run in order to pass emission test. After several drive cycles following recommended procedures, O2 heater monitor and O2 monitors will not run. There are no codes present, other monit...	View
	1972 Chevrolet corvette 5.7L wiper system looking for a wiring diagram for this veichle for the wiper system wiring has been cut wipers will work as long as u have the wiper washer button pushed in and you can control the speed of the wiper motor as long as you keep the washer button pushed in we are ...	View
	1994 Chevrolet S10 Blazer Tahoe 4.3L EGR system VIN: 1GNDT13W2R This will be the fourth time I have cleaned the egr valve. Nothing is wrong with the valve itself, it just keeps getting clogged up with carbon. My question is will removing the lower intake manifold and hot tanking it solve my problem. I have run into this al...	View
	1995 Chevrolet Lumina 3.1L no check engine lite VIN: 2G1WL52M2S just got this lemon at auto auction . next morning no start . cranks ok has spark no inj ps/ws, no check engine lite. checked all connections. tryed 2 used ecm"s . fuses ok . scanner won't communicate aldl has voltage.note ecm is in right front fender .any hel...	View
	1996 Chevrolet Camaro Z28 5.7L Misfire VIN: 2G1FP22P5T Hello everyone We have this beauty in here for bucking under load. I have scanned it and came up with miss in #8 cylinder. Replaced plugs and #8 was fouled, looks like oil burning(hard deposits). After the plug replacement took it on road test and cleared up ...	View
	1999 Chevrolet Tahoe LS 5.7L Hesitation, Surge, Cuts out, Misfire VIN: 1GNEC13R2X When the problem occurs, the voltage reading on the scanner on both front O2 sensors goes to zero. With O2 sensors disconnected the reading on the scanner stays at .445 volts on both sides. While the trans is acting up, I can tell the motor is only running on ...	View
	1999 Chevrolet Malibu 3.1L Cylinder #2 VIN: 1G1ND52MXX Replaced lower intake gasket. All pushrods were installed into correct locations relative to exhaust/intake valves. Upon first start after reinstalling everything, had backfire through exhaust. Pulling cylinder #2 plug wire stopped the backfiring. According to...	View
	2002 Chevrolet Silverado 2500 HD 6.6L MIL Lamp on VIN: 1GCHK23112 Hi folks bear with me this is my first help request. I do not have acces to all data or mod today. CUSTOMER BROUGHT TRUCK IN THIS MORNING, STATED SES LIGHT CAME ON YESTERDAY. CHECKED PCM FOR CODES,FOUND P0335 CKP SENSOR. CHECKED FREEZE FRAME INFO,NOT VERY HELP... Trouble codes: P0335	View
	2002 Chevrolet Impala 3.8L hazard switch VIN: 2G1WF52E92 vehicle came in with signals not working.we found hazard switch burnt out and wires meted in behind switch.we repaired the wires and put in a new switch,but now it still burns out every new switch we install.i put a low voltage circuit breaker in the fuse for ...	View
	2002 Chevrolet C3500HD 6.5L Hesitation, Surge VIN: 3GBKC34F62 We are a transmission shop and am unfarmilliar with diesel injection problems.First off the acelerator position sensor was replaced.The problem that I am having is when I am accelerating at moderate throttle the engine rpm will accelerate madly then slow down ...	View
	2002 Oldsmobile Silhouette GLS 3.4L right slide door VIN: 1GHDX23E71 Hello everyone Im haveing a problem with the right slide door on this olds van. the door has the auto open feature and wors well but if you lock the door it is hard to unlock, you can work the manual lock but it stays locked in the down position, it will come ...	View
	1993 Pontiac Bonneville SSEi 3.8L c68 electronic HVAC VIN: 1G2HY5219P Hope everyone is having a good weekend, I am posting for a friend, He has a 1993 Bonneville that came in with no heat complaint and the temperature display flashing. Entered self diagnostics and found a code 40 air mix valve circuit. The programmer defaults to...	View
	2000 Pontiac Montana 3.4L MIL Lamp on VIN: 1GMDX03E5Y hello this montana keeps freezing its air pump. ive made a water shield and checked all vac valves for propper opperation seems ok im not talking drops of water, its ice now locking pump guessing a cup or so Trouble codes: P0410	View
	2001 Pontiac Sunfire SE 2.2L abs module VIN: 1G2JB12411 This cars traction lamp, red brake lamp are on all the time with a code c1275, ECM request traction off. Power and ground at the pcm and ebcm are good. Any help would be appretiated.	View
	2002 Pontiac Montana 3.4L abs light VIN: 1GMDV03E02 Hi Have this montana ABS light/Traction control light come on about 26-28 MPH.Code C1234 sets in history.I have no information in shopkey for codes on this vehicle.I did take a movie with the Modis.The only change i can see in the data is SW Volts gradually dr...	View
	2000 Saturn LS1 2.2L clutch pedel VIN: 1G8JT52F2Y Hey guys hope someone has insight for me This Saturn after sitting over night looses clutch pedel Feels real sloppy . Then After pumping a few times it comes back and is normal ! After pedel comes back all feel normal No apparent signs of fluid leak (can't see...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1996 Cadillac Fleetwood 5.7L abs.traction control VIN: 1G6DW52P4T Thanks to all the members that replied,they know who they are,we continued diagnosis on the ebtcm and the large wiring plug at the ebtcm,we found that there was no continunity at pins 16 and 17,from the ebtcm to the connector at the l front speed sensor,not at...	7
	1997 Cadillac Seville SLS 4.6L dash lights VIN: 1G6KS52YXV Customer has not returned yet, but when he does I will post any additional information &/or fix. Thank you for the replies I have saved them for future reference.	3
	2000 Cadillac Seville SLS 4.6L MIL Lamp on VIN: 1G6KS54Y2Y Dealer re-learned crankshaft.Genisys has performed this procedure on other G. M. without problem.Any explaination to this? Trouble codes: P1369 (crankshaft variation not learned).	6
	1988 Chevrolet Van G10 4.3L lock bolt, spider gear shaft Hi Tech's thanks for all the replies. I had 64 replies in fact so this seems to be a common problem with these 10 bolts although this is the first one I have run into. The common answer that most techs had was that my local tool jobber would have a special lef...	65
	1994 Chevrolet Camaro 3.4L tcc VIN: 2G1FP2259R i finally fixed this problem and my hair can start growing back now. after much diagnostic time and time spent with the technical staff an shaffer shifter who were extremely helpful tracking down the problem. what we found that the later model camaros had 2 tc...	4
	1998 Chevrolet Astro 4.3L abs? VIN: 1GNEL19W9W Hi all, thanks to all who replied. 7 of you said that it was a power assist problem, but 2 said to disable ABS and roadtest. I simply removed the fuse and customer drove the vehicle for a week and all was well. He doesn't have the cash to repair the ABS system...	9
	2000 Chevrolet Cavalier 2.2L no start VIN: 1G1JC1248Y well this mind twister is finaly up and running i found a wiring diag that showed the 4class 2 seriel data lines of ckt 1807 and realised they were 4 seperate wires .they start at the bcm and go to the aldl ,pcm ,inst cluster ,and radio .i found a short to gro...	5
	2001 Chevrolet Silverado 1500 5.3L oil pressure VIN: 2GCEK19T91 Sorry I didn't get to fix it. With 1/4 million miles, the customer is just going to drive it. If you don't let it idle until it is fully warmed up, it is OK. I think I ruled out main or rod bearings; they would cause a problem that would get worse as the engin...	16
	2003 Chevrolet Silverado 2500 HD 6.6L abs VIN: 1GCHK24123 after checking systen when the ABS light on it had no codes. Unsure as to why self check does not complete unless you Do a KOEO for 20 seconds before start up. GM Tech Support is no help. Will post fix if I get one.	7
	1988 GMC C1500 Sierra SLE 5.0L Poor Idle Quality, Hesitation, Stall VIN: 2GTDC14H1J Hi I found the problem with the truck it turned out the reluctor solved the problem but having the scanner connected to the truck caused it to go into field test mode. Thanks to Jeffery from New York for the reply. Bob [...]	34
	2001 GMC Yukon XL 1500 SLE 5.3L Transmission 2-3 shift VIN: 1GKEK12T91 The majority of the responces were related to the 2-3 shift valve being stuck in the bore or the bore is worn or scored, Tim also brought up a GM TSB regarding this problem that was helpful. Also brought up was an ignition switch problem that could cause it bu...	7
	1988 Oldsmobile Cutlass Ciera S 2.5L Excessive Emissions, Poor Idle Quality, Stall, Poor Fuel Economy VIN: 2G3AJ11R3J Thanks guys who send all their reply. Most of the reply says about the injector. After talking to the manager in getting me a new injector it has fixed the problem. But I have to replace the O2 sensor too because when I'm diagnosing the car the rich condition ... Trouble codes: 45 (rich exhaust).	7
	1990 Pontiac Bonneville SE 3.8L Brake Lines VIN: 1G2HZ54C5L Thanks to all who replied. What a service IATN is !!! I have decided to order the 6mm bulk line from the dealer and while waiting for it to come in, I will use 1/4' line and ISO bubble flare the ends. Most of you said this would work. What bothers me is that t...	17
	1996 Pontiac Grand Am SE 3.1L cooling system VIN: 1G2NW12MOT Thanks to all who responded. It was the timimg cover gasket.It was interesting that half the respnses said they had never seen the cover leak and the others said it is fairly common at that location just below alternator.With a mirror and low pressure you coul...	21

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