GM Automotive Technicians Technical Discussion and Fixes for Aug 2, 2005

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Open Help Requests for GM

	Help Request	Answers
	1991 Buick Regal 3.8L Service Engine Light VIN: 2G4WB11L6M I have a service engine light that will not turn off.I have been using an OTC Genisys 2003 scanner and come up with a 041 code. This is for the cam sensor. Look up TSB's on All data before i get started and find that the 041 cam sensor code is a problem. I pul...	View
	1994 Buick LeSabre Custom 3.8L Hesitation first of all sorry about no vin, stopped by work after my wife was just addmitted to the hospital, and had my 19 m.o. son along. cust commented stall at stops, also thought they had a trans problem, and thought needed tune-up, test drive yesterday, could not d...	View
	1996 Chevrolet K2500 5.7L No Start, Hesitation, Cuts out, Stall VIN: 1GCGK24ROT Hello everyone, We have been working on this truck on and off for a few weeks. This truck will start and drive,has good power,and it will work fine a few days and then sometimes it will quit.It only Quit once for us and it would not start, but by the time I op...	View
	1997 Chevrolet K3500 7.4L Fuel psi, extended crank VIN: 1GBHK39JOV this is a personal truck. The truck needed a new fuel tank. So i installed new tank sending unit and fuel pump right amay. just before that it started having a longer crank time. Now i have had a problem with extended crank. I checked the fuel psi. i know that...	View
	1997 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNDT13W1V This vehicle came in with an overheating problem. I checked the customers work, found to be OK. They said it overheated on the way to the shop. I checked the coolant level. Found to be 3/4 gal low. Suspect air bubble in system and cleared out when they parked ... Trouble codes: P0117	View
	1997 Chevrolet Express 3500 5.7L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G45DC2R0V Posting this one for a friend. This vehicle came in with both banks lean codes and o2 codes. Tuneup was done elsewhere. All tuneup items were checked and double checked. Spider injection unit from the injector guru was installed. Same problem. Idle miss and wo... Trouble codes: P0171	View
	1998 Chevrolet Tahoe LS 5.7L Surge VIN: 1GNEK13R7W Hi gang. Been a long time since I posted a help request! But I am stumped, this thing surges/trailer hitches in O/D under light load. LT fuel trims get down to -14 when it happens. I unplugged the MAF sensor & it works fine, the fuel trims only go to like -6. ...	View
	1999 Chevrolet Malibu 3.1L abs light on codes c1235/c1234 VIN: 1G1ND52M9V HELLO: Still racking my brain on this one, car came in shop needs engine, & abs light was on, replaced engine and abs light is still on, but noticed someone has allready been doing some work on it before, main fuse box has been removed,and instrutment cluster ...	View
	1999 Chevrolet Silverado 2500 6.0L Hesitation, Back fire VIN: 1GCGK29U0X Hesitates only for about the first 4 or 5 accelerations after start up. Back fires through intake manifold. On wide open throttle O2 goes lean. Bank 1 cat is partially plugged on back pressure test it is at 3 psi at 2500 rpm and Bank 2 is at 1 1/4 psi at 2500 ... Trouble codes: P0137, P0157	View
	1999 Chevrolet Express 1500 4.3L Poor Idle Quality, Stall VIN: 1GCEG15W2X Gonna write a love letter on this one so sit down... The customer complaint is that the vehicle dies when coming to a stop, at a stop, or leaving from a stop. The van drives absolutely perfect other than that. The owner, having some mechanical ability, instal... Trouble codes: P1870 (Transmission Component Slippage), UNKN0	View
	2000 Chevrolet Silverado 1500 4.8L signal lights, dash lights VIN: 2GCEK19V2Y Customers complaint is when the left turn signal is on, the dash lights flash. When right signal is on everything works fine. When brake is applied, dash lights go out. When cruise control is on and headlights are turned on the cruise cancels. BUT this only ha...	View
	2001 Chevrolet Blazer LS 4.3L Poor Fuel Economy, MIL Lamp on VIN: 1GNCS13W51 This thing came in with a complaint of MIL on and poor fuel economy...Scanner revealed bank 1 and bank 2 rich codes. Long term fuel trim was at -12 to -14. Tested fuel pressure, was @62 psi but did not hold...would drop down to 25psi within a matter of one m...	View
	2002 Chevrolet C3500HD 6.5L excessive smoking VIN: 3GBKC34F92 I am not a diesel mechanic but this one belongs to a very good customer. I appreciate any help or advice. This truck smokes some on startup but smokes very bad on acceleration. Oil has been leaking out of connection between turbo & exhaust pipe. There seems to...	View
	2002 Chevrolet Impala 3.4L battery VIN: 2G1WF52E92 Hello, We have this 2002 impala with a key-off drain. After vehicle times out and goes to sleep (approx. one hour), we still have 1.2 amps drain. Dis-connecting radio in vehicle brings drain to 400mA, also radio remains hot (temperature) in this vehicle hours ...	View
	1996 GMC K2500 Sierra SL 5.7L No Start VIN: 1GTGK24ROT HI TECH`S THIS K2500 HAS A NO START PROBLEM MOSTLY WHEN HOT OUTSIDE [90` PLUS] - THERE IS NO FUEL PUMP OPERATION - WHAT WE HAVE FOUND IS THAT THE RELAY IS NOT BEING TRIGGERED BY COMPUTOR WHEN KEY IS CYCLED. this truck does not have anti theft. have did ohm tes...	View
	2003 GMC C5500 Topkick C5C042 6.6L fuel gauge inop VIN: 1GDE5E1173 We are looking for any information that could help us locate the problem or a wiring diagram so we can better locate it ourselves. We have very limited data on the problem because of not having the resources to diagnose it. This is what we know--the fuel gauge... Trouble codes: 463 (1093 -), 1093 (1172 -), 1172	View
	1999 Pontiac Sunfire SE 2.2L Misfire VIN: 1G2SB1244X this car has a long cold start and runs rough after first starting. if you hold the car to the floor when cranking cold it seems to strat faster. the fuel presure is in specs and holds normaly.the fuel filter was restickted and has been changed with no improve...	View
	2000 Pontiac Grand Prix GTP 3.8L evaporator housing VIN: 1G2WR1218Y I have this family member's GTP that when he drives for long trips, greater than 150 miles, water from the evaporator collects on the floor instead of out the drain hole. When he uses the car on the highway and around town the drain works fine. Has anyone had ...	View
	1996 Saturn SL2 1.9L horn VIN: 1G8ZK5279T Can someone tell me where the horn relay on this thing? It's not in the main relay center under the hood where both Alldata and relay center lid show it. There is a place for it but no wires going to it. The horn dosen't work and the fuse is good. I can't hear...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1987 Cadillac Fleetwood 60 Special 4.1L Hesitation, Cuts out VIN: 1G6CS5186H I apologize, I thought this was closed out. The repair was a stopped up muffler.I cut the pipe between conv. and muffler. the customer had us do converter and muffler. thanks everyone	32
	1992 Chevrolet K1500 Suburban 5.7L overdrive VIN: 1GKFK16K9N Installing a small spring behind the TV valve fixed it. This kept the valve from sticking and thinking that the throttle was wide open. Thanks	8
	1994 Chevrolet K3500 Cheyenne 6.5L Hesitation, Cuts out, Stall VIN: 1GCHK39F2R thanks to all that responded, as I stated we finally replaced injection pump and fuel module, we remotely mounted module as advised, customer drove truck one week and said problem was still there, we tried to get truck back in for further testing as this inter...	5
	1995 Chevrolet C2500 Cheyenne 5.7L Excessive Emissions, Hesitation, Stall VIN: 2GCFC29K3S After removal of the Catylytic Converter at a local Muffler shop the broken front Grid section, and the melted rear portion. It was all clear what the problem was it is great to have this one back on the road Thanks for everyones replies its a wonderful world	17
	1996 Chevrolet Corsica 2.2L steering wheel VIN: 1G1LD5548T This vehcile was not repaired because of lack of help on this one, the customer just decided not to repair since they were going to trade it in october. The customer did add one additional note to the repair order and that was that it always occured at the sam...	8
	2001 Chevrolet Express 3500 5.7L Starter VIN: 1GAHG39R21 Thanks to all that replied. I installed a starter in the van and a new starter relay. It seemed to fix the problem. I was not able to get the van to act back up. They have not come back.	8
	2001 Chevrolet Silverado 2500 HD 8.1L MIL Lamp on VIN: 1GCHK23G81 Thanks to the members with their replies. The problem ended being the fuel pump module assembly that was previously install at our shop. The original module only had two line connections(fuel outlet and inlet)and the replacement module had three being the extr... Trouble codes: P0442.	3
	2002 Chevrolet S10 2.2L running rough VIN: 1GCCS19581 We start the engine again, after a few minutes, car start missing, and we heard something sparking, we saw the spark coming from one of the spark plug wire. Simple as this. This problem has been solved by replacing the spark plug wire set, but why check engine...	2
	1946 Pontiac N/A CID Coil Wiring OK ... so no resistor is needed on a 6 volt system. I guess I really knew this, but the metal sleeve that the wire is run through made me think that perhaps this is a resistor wire and the sleeve is a heat shield. Many of the replies stated that the sleeve is ...	30
	1996 Pontiac Grand Am SE 3.1L Alternator VIN: 1G2NE52MXT Well this one turned out to be a real nightmare! I found out the customer had just purchased car from backyard mechanic-car jockey.Engine had been replaced and many body partreplaced and wires spliced everywhere.The only way I could get the alternator to charg...	13

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