GM Automotive Technicians Technical Discussion and Fixes for Jul 13, 2006 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1995 Buick Riviera 3.8L Accessories VIN: 1G4GD2216S This Regal, equipped with controls at the steering wheel for radio and AC, suffers from random changes of AC temp settings, radio volume, radio stations, and blower control. It appeared to be caused by moving of the steering wheel (that is why we changed the c...	View
	1998 Cadillac Seville SLS 4.6L hvac -ipc display VIN: 1G6KS54Y6W hello, i have a 1998 seville with no vf lights except for radio. have good power and ground to ipm except for 55 volt display feed. cannot find if voltage on circuit 1369 yellow wire is coming from ipc to ipm or visa versa. any insight would be appreciated.	View
	1992 Chevrolet Cavalier RS 2.2L master cyl VIN: 1G1JC1446N guys, reading all the information on the archives ,i think now , this problem is in the abs hydraluic unit and its piston positions. can some one please correct me on this one?.and what scanners can we use to rehome pistons? we have a genysis spx, i tried this...	View
	1993 Chevrolet K1500 Suburban Silverado 5.7L Poor Idle Quality, Hesitation, Stall, Misfire VIN: 1GNFK16K6P on initial am starts idle fluctuates up and down between 400 and 800 rpm. sometimes it will stall/die. will restart okay but when driving it will usually die at first stop. on acceleration there is a bad misfire. it acts like a flat spot, if you give it more o...	View
	1996 Chevrolet Corsica 2.2L no power VIN: 1G1LD5544T this car has no power at any time. smooth idle, but when driving, forget it. feels like driving in third gear, but trans does shift at regular points. we replaced head gasket as there was external leakage, along with plugs, wires, fuel filter, moro-vac, air fi...	View
	1997 Chevrolet K1500 5.7L Misfire, MIL Lamp on VIN: 1GM6546364 I have a 97 Chev Pickup 5.7L with a random misfire code 300. I've replaced all secondary ign components and clean fuel system with motor vac. My scan tool shows #4 and #3 cylinder misfire, #4 misfires much more then #3. It happens on accel up hill and when I c... Trouble codes: 300 (Random Misfire)	View
	1998 Chevrolet Corvette 5.7L Valvetrain VIN: 1G1YY22G1W Came in for running poorly, and MIL on. Customer stated it happened after missing a shift into 4th gear. My questions are: Why did this happen? Shouldn't rev limiter kicked in before damage occured? Could rod stretch be a factor?GM dealer had to order exhaust ...	View
	1998 Chevrolet Astro 4.3L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1GNDM19W8W Customer complained vehicle intermittantly revs up like stuck throttle when actually throttle isn't sticking happen at a idle and cruise. when this happenned check engine light flashing. turned key off then restarted and check engine light steady on but idle i... Trouble codes: P0300	View
	1999 Chevrolet Silverado 1500 5.3L Unknown this truck has a 4L60 trans, it shifts late to second gear([...]-4000 rpm) also no overdrive, has code 1870, and tcc slip is [...] most of the time, it has been my experiance that it proboboly needs that valve in the vb replaced, but is a late shift a...	View
	1999 Chevrolet Silverado 1500 5.3L 1-2 shift and no od this truck has a 4L60 trans, it shifts late to second gear([...]-4000 rpm) also no overdrive, has code 1870, and tcc slip is [...] most of the time, it has been my experiance that it proboboly needs that valve in the vb replaced, but is a late shift a...	View
	2000 Chevrolet Impala 3.4L electric VIN: 2G1WF52E0Y It is not a big problem. I do not know what catagoly it is included in. After changing engine oil, I set the key on and put the gas pedal three or five time, and key off. I expected that "replace engine oil" message went out. However, it did not happen. How co...	View
	2003 Chevrolet W3500 Tiltmaster W3S042 4.8L fuse's VIN: J8BB4B1443 help have this chevy w3500 box truck. the boby is bulit by isuzu. the problem i have is there four fuse in the fuse box behind the golve box that has no power on either side. we have mitchell,identifix, can't seem to find any wiring diagrams. can't find anythi...	View
	2003 Chevrolet Silverado 1500 4.3L anti theft VIN: 2GCEC19X93 hello techs. this time i have an anti theft problem.the truck was towed in because the customer said he got in the truck after stopping for fuel and it would not restart .when i tried to start it it would act like it wanted to start but would not .after spinni...	View
	1997 GMC Sonoma SLE 2.2L Clutch VIN: 1GTCS1942V The vehicle is difficult to get into gear. The clutch was smoked when it came in. We replaced the clutch, pressure plate, throw out bearing, pilot bushing, flywheel, slave cylinder, clutch master cylinder. We have bled the system every way possible. After sitt...	View
	1998 GMC Jimmy Envoy 4.3L Stall VIN: 1GKDT13W5W Hello everyone, This truck is stalling just driving down the road after it is hot, customer state's that the tach pegs out then back to zero when it shuts down. It does start right back. My boss has it happen once with fuel gauge on it and it did not lose any...	View
	2000 GMC Jimmy Diamond Edition 4.3L igntion key VIN: 1GKDT13W1Y i can put ket into igntion switch start car put into gear all good but if you try to take key out it only returns halfway. tried to find help in alldata nothing available or i'm looking in the wrong place. please help	View
	1997 Pontiac Grand Prix SE 3.1L fuse for compressor VIN: 1G2WJ52MXV Car came in no AC replace compressor fuse and did performance check and gave back to owner. Came back blown fuse, replace fuse and did check. Owner came for car and it would not leave lot w/o blowing fuse. They took it then and brought it back. Intermittantly,...	View
	2002 Pontiac Grand Am SE 2.2L No Start VIN: 1G2NE52F22 Hello fellow tech's, we have this Grand Am that came in on the hook with a no start condition. It had good spark, fuel pressure and compression but no injector pulse. We had battery power at the injector's but no signal from the computer. Scanner showed no inj...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1996 Buick LeSabre Limited 3.8L Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G4HR52KXT All replies were great. I ended up going down to the chevy dealer and borrowing a tech two scanner and checked the voltage of the map sensor with that, and it checked to 1.2 volts. It just goes to show you can't always trust your machines(my solis was saying t... Trouble codes: P0300.	7
	2000 Buick Regal LS 3.8L power windows VIN: 2G4WB52K4Y First let me say thanks to all who took time to help.It was indeed abroken ground.I trace the problem and fixed the broken ground.I did end up having to replace the drivers front motor-it was very week and moved realy slow.Thanks again for the help.	18
	1991 Cadillac other 4.9L No communication When the motor conversion was done, some of the ECM connector terminals were not crimped properly causing intermittent drivability problems and no communication with the scanner. 'Tug-tested' all of the connector wires and repaired the ones which came out easy...	2
	1993 Cadillac DeVille 4.9L Poor Idle Quality, Surge, Cuts out, Stall, Poor Fuel Economy VIN: 1G6CD53B6P Well, as I said before Juan from California hit my bigger problem dead on with the #2 injector fuse blown under the passenger side hush panel. Then it ran better, but I had no decent idle quality and I couldn't get it to idle under 2k. Even though I had alread...	18
	1984 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1AY0784E Gentlemen This Vette is fixed and running stronger than it has in the last 12years (according to customer). Fredrick hit the nail right on the head, went in to work this morning and checked the distrubitor for ground and I had 6.2ohms, wow pulled dist out of m... Trouble codes: 42 (esc).	8
	1991 Chevrolet Camaro RS 3.1L No Start, Poor Idle Quality, Cuts out, Stall, Misfire VIN: 1G1FP23T8M Will fix tomorrow w/new injectors. Thanks for replies and car always had good spark/fuel, would run when cold for decreasing times down to 2 minutes cold, never any codes, had replaced coil (warrranty), Module, and Tps (had dropped out) and Ecm when Injector p...	5
	2001 Chevrolet Express 3500 8.1L Cuts out VIN: 1GAHG39G31 The largest number of responses indicated that the CPS was a known problem which could exhibit the symptoms of stalling while driving and restarting after stopping and either immediately cranking or waiting for a short cooldown period. The pattern of the senso...	7
	2002 Chevrolet Astro 4.3L No Start VIN: 1GCDM19252 Well I got this one fixed, pulled the connector apart and found it was very corroded on the back side of the pins. Put new pins in and truck never died again. Trouble codes: P0341 (History Code), P0341 (History Code), P1122 (History Code), P0122, P0300 (Engine misfire detectedfail since clear), P1122 (History Code).	6
	2003 Chevrolet Suburban 1500 LT 5.3L compressor belt tensioner VIN: 1GNEC16ZX3 Thanks to all. Replacing compressor fixed the problem.	9
	2005 Chevrolet Astro 4.3L engine cooling VIN: 1GCDM19X85 After some helpful hints, i removed the front grill and fan shrouding and separted the radiator and the ecore for a inspection and found that even though these are almost new vehicle that they can pack enough dirt and grim between the rad and condensor for 20 ...	11
	2006 Chevrolet Corvette 5.7L CD changer VIN: 1FASTCORVE A big thank you to Terry [...] for lending their expertise. Both were correct in saying this CD changer is a straight plug and play despite the navigation and XM systems already installed. Also they both felt there would likely be no comm with ...	2
	2002 GMC Sierra 2500 HD SL 6.6L MIL Lamp on VIN: 1GTHK29182 Thanks to everyone that provided tips on this repair. Checked EGR system last to be sure the valve wasn't hanging up or that a vacuum leak was present. It was all good too, so I had checked everything except the CATALYTIC CONVERTER. The cat is nothing but a bi... Trouble codes: P0101 (MAF out of range).	9
	1992 Oldsmobile Achieva S 2.3L timing chain VIN: 1G3NL5434N It is out the door but I am not certain if it is fixed completely. I asked what oiled the timing chain and no one seemed to know, but it appears that it is only drips from the camshaft bearing. The back of the chain housing is designed so that the oil from thi...	6
	1995 Oldsmobile Aurora 4.0L No Start VIN: 1G3GR62C75 I'm not sure what happened but it starts and runs. I belive it has a bad ground. When I started checking voltage drop across the grounds things started working. However I may have just bumped some random wire. At any rate it runs and I hope I never have to fin...	4
	1998 Oldsmobile 88 Royale 3.8L pwr windows, fuel pump VIN: 1G3HN52K1W well once again the IATN helped, the ground tree beside the drivers seat was corrodid. spliced all the grounds together & after 3 weeks no more problems. Thanks for all the posts!!!	13

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