GM Automotive Technicians Technical Discussion and Fixes for Aug 31, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1987 Buick Regal GNX 3.8L fluid leak at breather tube VIN: 1G4GJ1174H thanks for reading my post. i have this grand national that has a trans leak at the top of the transmission through the breather tube. the transmission is not over full and it operates properly. the trans mission has been replaced about 7 years ago with a perf...	View
	1989 Buick Century Custom 2.5L Poor Idle Quality VIN: 1G4AH51R7K This car has a very erratic idle. It will idle normal and then start raising until its over 2000 rpm. Then sometimes it comes down and surges up & down. and then goes high again. We have replaced the ECM, IAC, injector and MAP sensor. The throttle body has bee...	View
	1996 Buick Regal 3.1L Calipers/Pads I am looking for anyone that has experienced a W-Body GM car that came in with the outer pads missing on the rear disc brake calipers. I know from my experience, the slides were the problem. They would freeze up causing the inner pad to do all the work. What I...	View
	1995 Cadillac DeVille 4.9L performance VIN: 1G6KD523B4 car has no power. when you break torque it a code 99 flashes on my snap on scanner. cruise control servo applied. then engine has no power due to the strategy of this code, the ecm will shut down half the injectors. on my scanner i shows koeo 33% when you star...	View
	1982 Chevrolet Corvette 5.7L No Start, Contamination VIN: 1G1AY8781C This C-3 is worth plenty of money...once it runs. Extremely low miles, mission is to get it running. Unfortunately the fuel tank sender and pump assembly has rusted off in the tank and severe contamination is evident. Although there is rust in the tank it appe...	View
	1983 Chevrolet C10 Suburban Custom 6.2L Poor Idle Quality, Surge, Stall VIN: 1GDT355H67 this is where it is getting fun. they could not locate my original pump so they gave me another reman so i took it to a local rebuilder and he found plenty wrong with it well i install the pump for the third time and it starts ok but it will idle up and down o...	View
	1988 Chevrolet K1500 Cheyenne 5.7L Cuts out, Misfire VIN: 1GTDK14HBU truck came in with no power off idle.did a spark check and found weak spark.installed rebuilt distibutor.now the engine will rev up to around 300rpms and start backfiring out the exhaust.has dual t-pipes and shoots flames.very loud in the shop.seems to have go...	View
	1995 Chevrolet K2500 Suburban 6.5L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1GNGK26FXS Truck starts very hard when cold, has very heavy smoke. Runs with good power, but has a miss. Trouble codes: 13 (engine shut off driver fault), 48 (intake air temp sensor circuit high), 62 (turbo sensor circuit low), 91 (cyl balance failure 1 cyl)	View
	1996 Chevrolet C1500 Suburban LS 5.7L Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GNEC16R8T Hello everyone I have waited as long as I could before posting for help, but we are against a wall. This suburban came in a couple a months ago and we installed a Jasper engine. Last week it came back, not sure if there is any relation to engine install. What ... Trouble codes: 1345 (cam crank sensor corelation problem)	View
	1999 Chevrolet Silverado 1500 5.3L abs stop VIN: 1GCEK14T6X Customer complaint ABS pulse @ low speed stop, verifying condition and is true at low speed stopping, below 10 mph, abs ratchting condition at all times. System hookup and sensor monitoring revealing no serious or exception speed variation between front left &...	View
	2002 Chevrolet Corvette 5.7L flywheel VIN: 1G1YY22G82 The question for GM Corvette techs is. The ls1 engine is supposidly balanced with the hamonic damper and flywheel meaning that when they balanece the crank, they also balance teh damper and flywheel as a unit. My customer wants to install a excedy clutch and f...	View
	1996 GMC Jimmy 4.3L code 1860 VIN: 1GKDT13W3T hope someone can help me on this one...the truck came in with light on with 1860 code tcc fault. i dont have a trans cartrige to check into this futher . the freeze frame says the code was set at 2 miles an hour the customer states it jerks when taking off mus...	View
	1997 GMC Safari SLE 4.3L Hesitation, Cuts out VIN: 1GKEL19WXV I am grasping at straws on this one. After driving a long time, usually a couple hundred miles on the freeway, when you stop and then take off again, the engine runs rough for a second or two and then runs fine. It has occurred once after driving for only abou...	View
	1992 Oldsmobile Toronado 3.8L Dash waring display , The A/C ,heater display VIN: 1G3EZ13L9N The customer came in complaining that the electronic display on the dash and the electronic dislpay on the temp. contols go out when the car is cold or wet.The systems work when the car is warm or dry.When they go out the dash disply is blank and the temp cont...	View
	2001 Pontiac Grand Am SE 2.4L No Start VIN: 1G2NF52T41 I reassembled car and tried the BCM/ECM relearn procedure after reading some closed no start help requests on here (the 10 minute wait relearn). The car will start and die, but the security light is not operating as my Shop Key describes it will. When I try to... Trouble codes: P1632 (Theft System Fuel Disabled Signal Recieved)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1986 Chevrolet Caprice Classic Brougham 4.3L Hesitation, Surge VIN: 1G1BN69ZXG First I would like to thank the seven people that took time from their own buzzy day to help me.We were unable to locate new prom.GM dicontinued part Sept 03.We ran jumped wires to eliminate harness problem and switch wires to other solenoid to prove valve was...	7
	1987 Chevrolet motorhome 454CID cooling system VIN: 1GBKP37W6H Thanks to all who answered my cry for help. Most of the suggestions we had already covered but just in case we went back through each reply to verify. Thanks especially to Dennis [...] @ A-1 radiator for some very good information. Also Blake [...]. Altho we s...	32
	1991 Chevrolet Corsica LT 3.1L Stall VIN: 1G1LT53T4M replaced tps. never saw it glitch or anything, but that was the most common reply. drove it all day and no more stalling. thanks everyone.	6
	1994 Chevrolet S10 LS 2.2L pump / bushing VIN: 1GCCS194XR Thanks to all for the detailed info given to me - general concensus says I needed a pump puller to prevent possible breaking of case or pump body & a pump alignment band to keep the pump halves together while tightening the bolts, but both could be done withou...	8
	1997 Chevrolet K1500 Cheyenne 5.7L ecm-b fuse VIN: 2GCEK19R4V Hello, I remove the fuel pump to find wiring to pump connector was melted. replaced fuel pump and retested vech runs great and no more blowing fuses. Thanks guys for all your help.	8
	2001 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G1JC12451 I would like to thank everyone who took time to help me The repair was a charcoal canister. I check for reflashes but none applied. I used a motovac evap checker and a vacutec smoke machine but could not find a leak. The dealer found the leak and said when he ... Trouble codes: P0442 (EVAP system small leak detected).	6
	2002 Chevrolet S10 2.2L Hesitation VIN: 1GCCS14571 Three Techs got it right. Paul from Massachusetts hit it on the head. When I back probed 1 and 2 ign wires to the Ign switch when it would act up there was a voltage drop. I replaced the switch and drove the truck a few days myself with out any problems. I the...	10
	1991 Pontiac Grand Am Value Leader 2.5L Poor Idle Quality, Cuts out VIN: 1G2NG14UXM Check vacuum leaks have not found any. Haven't had enough time to pursue any further. Thanks for all the replies.	6
	1991 Pontiac Grand Am Value Leader 2.5L timing chain tensioner VIN: 1G2NG54U0M I don't know if this is really a fix or not but it is the best I can do given the circumstanses and the customer's thoughts on spending the extra money necessary to fully investigate further. One person suggested checking the cam and crank gears for runout. ...	5
	1999 Pontiac Grand Prix GT 3.8L Poor Idle Quality, Stall VIN: 1G2WP52K9X I never did get a chance to finish this problem, the customer declined further repairs and is going to live with the problem. Most replys felt the PCM was at fault.	3

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