GM Automotive Technicians Technical Discussion and Fixes for Feb 15, 2006

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Open Help Requests for GM

	Help Request	Answers
	1993 Buick LeSabre Limited 3.8L automatic air/heat VIN: 1G4HR53L5P Looking for some help on this 93 buick lesabre. The car has automatic heat and air conditioning. Intermittently the display on the control head will start flashing and it will start blowing cold air. I went into the self diagnostics on the control head and fou...	View
	1993 Buick Regal Limited 3.8L No Start VIN: 2G4WD54L5P Engine turns over but no start. No MIL, No codes, No Spark, No Fuel. Went through the diagnostic procedures (per Alldata) for No MIL, no start. Results recommended PCM replacement. Replaced PCM and all problems still remain. No signals to ignition or fuel sys...	View
	1993 Chevrolet Camaro Indianapolis 500 Pace Car 5.7L No Start, Cuts out, Stall VIN: 2G1FP22P0P Car came in on hook no start code 42 replaced ign. module for code 42 fixed 42 and 41 popped up .ran gm trouble tree for code 41 all checked ok and it said to replace ecm .ran pre ecm replacement chart all power & grnds ck ok.,KOEO all gnds 45-55 mv.replaced e... Trouble codes: 41 (est shorted or open), 42 (ign module replaced and cleared 42 but but 41 popped up)	View
	1994 Chevrolet S10 Blazer Tahoe 4.3L No Start VIN: 1GNDT13W3R vehicle was towed in as a no start. cranks good. diagnoised bad fuel injector assembly. vehicle sat on lot till bill was paid (about 2 monthes). we started it from time to time, now the customer has paid his bill and we went out to start it for him and same pr...	View
	1996 Chevrolet Corsica 3.1L Surge, MIL Lamp on, bucking VIN: 1G1LD55MXT Vehicle came in with check engine light on and missing at idle. checked ignition secondary scope pattern and found numerous spark plug cables going to ground. Replaced all ignition cables and spark plugs with oem parts.Cleaned fuel injectors and replaced pcv v... Trouble codes: P0336	View
	1997 Chevrolet Cavalier 2.2L pcm/alt VIN: 1G1JC5242V vehicle came to shop with engine locked up.after engine replacement vehicle is not charging.i have battery voltage at alt.i am only getting 5v at control wire(red)to regulator.should this be 12v to turn on alt?if so the only thing that i see that controls this...	View
	1999 Chevrolet Blazer 4.3L engine VIN: 1GNDT13W4X good morning all, this ones been a killer $$$ vehicle came in for maintenance and after inspection,found oil leaks and coolant leaks. upsold repairs which included intake gasket / vc gaskets / and after removal of brackets found headgaskets leaking coolant (ex...	View
	2000 Chevrolet Venture 3.4L unsure VIN: 1GNDX03E9Y This truck has a pop in the right front suspention/strut only when wheels are turned and slowly creeping.I have inspected all the cradle mounts,bushings,strut,etc. and cannot locate the problem?I have taken out the strut and even replaced the upper mount. You ...	View
	2000 Chevrolet S10 2.2L radio, service engine soon light. VIN: 1GCCS1452Y vehicle came in with dead battery. recharged , no other problems found. thought customer had left something on. repeated several times over 2 months. finally we found the ses light on and radio stayed on with the keys out and in your hand. the radio has the op...	View
	2001 Chevrolet Camaro 3.8L Park/Courtesy VIN: 2G1FP22K51 Thanks ahead of time for any help on this car. It's a 01' Chevy Camaro that sometimes the park/courtesy lights will stay on and never turn off after locking car with remote. Other times it will work fine as your indicator that the car has locked, along with th...	View
	2001 Chevrolet Silverado 1500 HD LS 6.0L Drive-axles VIN: 1GCGK13UX2 Hi, Im hoping some one has a trick to get the lefthand stub axle out of the housing so I can replace the axle shaft and seal. Ive done many seals and bearings in the past and never have had a problem getting the axle out of the housing with either 2 prybars or...	View
	2001 Chevrolet Venture LS 3.4L Excessive Emissions, MIL Lamp on VIN: 1GNDX03EX1 Van fails efficiency at idle? Freeze frame data always shows between 600-700rpm. This van originaly had a convertor replaced by another tech about 1 year ago. I got it a couple of weeks ago because of the P0420 DTC. Checked it out and found a dirty MAF and con... Trouble codes: P0420 (TWC efficiency below threshold)	View
	2002 Chevrolet Silverado 3500 6.0L Misfire VIN: 1GBJC34U22 gm techs help, this 1 ton has a main fuel tank and a aux. fuel tank. aux tank fuel pump never comes on to pump fuel into main tank. found fuel pump relay for main tank but not for aux. tank. owners manual shows a upfitter relay located in a center of dash fuse... Trouble codes: P0300 (misfire)	View
	2004 Chevrolet Silverado 1500 5.3L Tire size VIN: 2GCEK19T54 Hi guys, This is my truck. I just recently replaced my (P245/75/16) wheels and tires with (P265/70/17) wheels and tires. Outside of maybe throwing the speedometer off a little, if I don't recalerbrate the computer, will it affect anything else in the truck? I...	View
	2004 Chevrolet Colorado 3.5L suspension Hello everyone, I am working on a 2004 Colorado 4x4 that is used as a mail delivery truck, the vehicle has an intermittent vibration when driving at 50 mph that disappears when slowing to around 25 mph. The vehicle has been to Bill & Teds excellent garage and...	View
	1993 GMC Sonoma 4.3L transfer case VIN: 1GTCT1928P Good after noon Gm techs.I have a 93 sonoma that will not shift into 4wd high.If I put it in neutral it will shift to 4wd low and back to 2wd high.It will not go into 4wd high.I have tried a encoder motor and a TCCM and a switch, still don't work.I have checke...	View
	2001 GMC Sierra 2500 HD SL 8.1L turn signal switch VIN: 1GTHK29G71 This vehicle has a tilt wheel on it. Need to know how to remove the tilt lever and also how to get the air bag module/horn pad out. This is the first one I have done and what info I have is pretty vague or I'm just dense. Thanks for any help. John	View
	2004 GMC Sierra 2500 HD SLE 6.6L low rpm limit VIN: 1GTHK24294 when this truck is warm it intermitantly governs the throtle at 2100 rpm it has a code 1093 fuel rail pressure low on enrichment. their is no fuel in the oil and is starts great. i have scoped the fuel pressure sender with a vantage pro but the problem is to i... Trouble codes: P1093	View
	2004 GMC Yukon XL 2500 SLE 6.0L Blower motor VIN: 1GKGK26U44 Thanks for any possible insight...We have a 04' GMC YukonXL K2500. It has dual zone auto climate system on here. Complaint is that it sounds like for a split second the blower motor increases in speed or that the recirculate air door slightly opens (hard to te...	View
	1996 Oldsmobile Cutlass Supreme 3.4L Poor Idle Quality, Stall VIN: 1G3WH52X3T found engine starts and runs fine but the idle will drop and the engine will stall when you take your foot off the gas to stop. if in park the engine will start normally, search for an idle then drop and stall. we found lean codes in the computer but do not fi...	View
	1995 Pontiac Firebird Formula 5.7L Electronic VIN: 2G2FV22P7S O.k. techs. need your help. this vehicle was towed to the shop as a no start. During testing, found no 5v. fron ecm. Replaced ecm and had dealer reprogram. Got car back and now have reference. determined dist. has failed. Rplaced dist. and now starts and runs ...	View
	1999 Pontiac Montana 3.4L Poor Idle Quality, MIL Lamp on VIN: 1GMDX03E1X Car came in with service engine light on and running rough. found p0302 misfire #2 cylinder. Customer brought car back next day for a tune up. On the way to my shop the car started running very bad and overheating. Customer stated that car overheayed 3 or 4 ti... Trouble codes: P1404	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1999 Buick Park Avenue Ultra 3.8L Surge VIN: 1G4CU5219X I have not yet fixed this car because it has not been back. I now have some good ideas to try. Thanks to all of you that responded.	7
	1994 Cadillac Seville STS 4.6L Misfire VIN: 1G6KY5298R intermittent internal short in the EGR. pintle was fluttering at idle and occasionally sticking slightly open..No codes!! customer called 1 week later, said 'Runs Perfect!!'	17
	1968 Chevrolet camaro 250CID Misfire VIN: 123378N439 Thanks to all that replied, parts arived yesterday local napa dealer had all in stock except the air filter.	30
	1988 Chevrolet Caprice 5.0L No Start, Poor Idle Quality, Hesitation, Stall VIN: 1G1BN51H0J Thank you everybody for your replies. I have got this one thanks to Scott, Jerry, Jeff and Craig. This problem ended up having the magnet on the distributor shaft were cracked in four places. Replaced shaft and pickup (since I was there). Set timing as per spe...	16
	1991 Chevrolet C1500 Cheyenne 5.7L Cuts out VIN: 1545464616 thanks to all did turn out needed a factory dist thanks again	13
	1992 Chevrolet Cavalier RS 2.2L Cooling Systems VIN: 3G1JC1141N thank you for all the replies and input gents,after numerous phone calls hit the {rep} for detroit gaskets and had a long conversation.at the end, they admit they have a gasket problem and are offering monies back plus updated gasket kit with head bolts.we are...	22
	1992 Chevrolet Corvette 5.7L clutch pedal VIN: 1G1YY33PON heres part of the fix. after installing a new clutch master from the dealer which looked the same as the one I was getting from my AC Delco wearhouse, i notice the fitting from the line to the master leaking. I guess after tighten this a few times the flared e...	7
	1994 Chevrolet S10 2.2L blowing black smoke VIN: 1GCCS1447R Although I had a couple of leads from the 13 replies I recieved most asked questions that were already answered in my post. Things like 'did you check the fuel pressure?' and 'did you do a leakdown test on the injectors?' It is hard to spell out every step we ... Trouble codes: 45 (Rich Exhaust).	14
	1994 Chevrolet K1500 Cheyenne 5.7L 3-2 solenoid VIN: 1GCEK14K0R thanks all for the response. i believe i was chasing a ghost with the 3-2 sol. feedback fault reading from the tech 2. i did replace the pc solenoid and checked the accumulator pistons when i rebuilt the unit.all clutches air checked good. i had installed a sh...	4
	1999 Chevrolet Tahoe LS 5.7L transmission VIN: 1GNEK13R3X Customer finally gave go ahead to pull pan to inspect, found pieces of chunks of aluminum suggesting possible broken case lugs at intermediate plate. Customer opted to replace assembly as opposed to furthur labor for teardown. Thanks to all for your suggestion...	10
	2001 Chevrolet Impala LS 3.8L cooling fans VIN: 2G1WH55K11 I found the engine was getting to operating temperature, so i replaced the thermostat like bill from arkansas and gerry from michigan suggested. It has been working fine for 2 days now with no problems. thanks for all responses. i don't understand why low engi...	11
	2001 Chevrolet p 30 cutaway 5.7L starter/flywheel VIN: 5B4KP2R413 Hello, I would like to thank you all for your help with this truck. It turned out that the fix was a new starter with another new flywheel. I checked the clearance between the teeth with the old starter and the new starter, and it was the same. I don't know fo...	10
	2002 Chevrolet Malibu LS 3.1L LF suspension VIN: 1G1NE52J62 Thank for the help, I replaced the brg and hub with oem and the noise is gone. Over 1/2 for the replies said this.	18
	2002 Chevrolet Silverado 2500 HD 6.0L Fuel Level VIN: 1GBJC34U02 Well I can finally say that this one is fixed. There were a couple of problems. First problem was that the secondary fuel pump relay located next to the underhood relay box was faulty. The pcm grounds the tan wire at the relay when the fuel tank level in the f...	3
	2004 Chevrolet Avalanche 2500 8.1L engine VIN: 3GNGK22614 Thanks for the helpful replies! David from Pennsylvania, Kevin from Massachusetts, Clyde from N.C., and Dave from Wisconsin nailed this one. After further inspection, the intake bolts were found to be loose- some up to 1 1/2 turns! The smoke has subsided with ...	17
	2004 GMC Sierra 3500 6.0L Lighting VIN: 1GDJC34UX4 Well I thought it was a ground as most have said . I tried cleaning the factory grounds to no avail. So I just spliced into the bed harness (aftermarket) and made my own redundant ground and just like magic every thing worked properly.Thanks for the help.	10
	1995 Oldsmobile Cutlass Ciera 3.1L filling gas tank VIN: 1G3AJ55MXS this vehicle is fixed. we checked the charcoal canister and it had fuel in it. we changed the canister and the vent solonoid and the vehicle is gone! thanks for the help.	11
	2001 Oldsmobile Intrigue GL 3.5L radio VIN: IG3WX52HOI Thanks for all the responses and especially to Dave. Dave came thru with the unlock code. Thanks again Ken	8
	1994 Pontiac Sunbird LE 2.0L Rear drum brakes VIN: 3G2JB11H7R First off, thanks for all the replys. We did try disconecting the ABS module, trid the brake adjustment different ways (loose,tite,ect). A few replys said to check shocks, but they are not that old (or mounts). Mike [...] hit this one, there may have been a f...	17
	1995 Pontiac Trans Sport 3.8L Poor Idle Quality, Surge, Poor Fuel Economy, MIL Lamp on VIN: 1GMDU06L2S Thanks to all who replied. Special thanks to Dale and Scott both. Problem was in E.C.U., prom and ground circuit. Someone had been there before us and cut and spiced wiring. Put all back to factory, cleaned grounds under ignition module, had to replace both ec...	6
	1996 Saturn SC2 1.9L speedometer VIN: 1G8ZH1277T Thanks to all that responded. I am waiting for the customer to find a few days that he can give up the car so that I can give the Saturn dealer his old speedometer to send in and have the new one adjusted for the correct mileage. I,ll update once this car is f...	5

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