iATN Member GM Auto Repair Tech Exchange for July 1, 2008

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Open Help Requests for GM

	Help Request	Answers
	1988 Buick Reatta 3.8L Lighting Back lighting for the headlamp and wiper switches and also the shift indicator are inop-other back lighting such as the power mirror mirror switches work.Other lighting such as crt screen and digital dash work and dim with dimmer control-problem is just with t...	View
	1996 Buick Skylark 2.4L transmission Car sat for a about a month. Had been started several times and moved once. Went to pick up car for intermitant no start and the trans doesn't engage. Acts like it is stuck in park but shifter and shift cable move freely. Shaft on trans fork moves at least ext...	View
	1997 Buick Park Avenue 3.8L Excessive Emissions Hello everyone This customer just went on a 1200 mile round trip,has complaints of smelling fuel underneath hood on passenger side and fuel odors coming through the air conditioning vents. I checked for fuel leaks none found and I can also smell the fumes esp...	View
	2002 Buick Rendezvous 3.4L abs if you dont have the time to read my post please dont reply this vehicle came from the dealer and they said that it needed a abs module,it came in with a c0036, they claimed it had a c0035. when braking at slow speeds the brake pedal will pulsate and intermi...	View
	2003 Cadillac CTS 3.2L monitor's I have this car that came from the used car lot that will not run the cat. and Evap. I/M status system so it will not pass inspection. They said it set on there lot for about three months and they pulled it out to put it up for sale and the battery was dead. T...	View
	1985 Chevrolet El Camino 5.0L Cuts out, Misfire Hi this only happens under hard excelland and I mean hard up hill starts about 70 mph and if you stay on it it starts to buck and will all most stall out if you stay on it my first thought was fuel I tested it 8psi and 1/2 qt in 30, sec then I taped agage on t...	View
	1990 Chevrolet Van 5.7L Poor Idle Quality, Surge THANKS EVERYBODY BEFORE HAND FOR LOOKING THIS PROBLEM OVER FOR ME. THIS VAN HAD COME IN AFTER SITTING FOR ABOUT 2 YEARS WITH A RUNNING PROBLEM AND AN ANTIFREEZE LEAK. AFTER WE HAD REPAIRED THE LEAKS, ( ONE WAS THE INTAKE MANIFOLD LEAKING ANTIFREEZE AT THE FRON...	View
	1995 Chevrolet Cavalier 2.2L hydrocarbons Hello everyone and thank for the help with this headache. I have this 95 Cavalier 2.2 that fails the hydrocarbons by a few points no matter what I do. It seems to fail at both speeds on the dyno. The engine runs fine. The plugs look good, we put a new cat conv...	View
	2000 Chevrolet Malibu 3.1L MIL Lamp on p507 sets after 1.5 hrs of idle cleaned throthle body poss contamination indicates rpm high , idles normal any and all help would be welcome Trouble codes: P507 (idle control systemrpm high).	View
	2001 Chevrolet Prizm 1.8L detonation i have a 2001 chevy prizm , 1.8 liter toyota engine , that spark knocks badly upon acceleration, there is no egr system on this car to check, checked compression, and there is no leakage between cylinders , we have cleaned carbon out with engine cleaner, and v...	View
	2002 Chevrolet TrailBlazer 4.2L low power Thanks for reading. This thing has low power all the time, in fact, it wont go over 4K RPM and it takes it's time getting there. Low power during drive,But durring the CKP relearn it will go higher. Trims and O-2's are actually real good,+- 3-4. No codes, peri...	View
	1997 GMC Pickup 5.7L Hesitation, Surge, Misfire, MIL Lamp on bad hesitation timming retard is all ways surging high 24	View
	1998 GMC Envoy 4.3L instrument cluster this car has been in several times for this issue.replaced headlamp switch(oem) and turn signal(oem). everything worked for 1 day.then back to the problem. when you turn on the headlights the instrument panel does not light up and the radio display and overhea...	View
	2002 GMC Sierra 6.0L Misfire high milage work/service truck. when first started cold or after sitting hot for a few minutes, engine runs fine at idle. run engine speed up to 3000 rpm-idle and then lose cylinders #1/2/4. induced fuel and verified ignition good, no change. engine vaccum dro... Trouble codes: P0300 (random engine misfire).	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2000 Cadillac DeVille 4.6L Left rear power window and door lock Thanks for all the great help and info. Problem turned out to be a bad ground on the tan/white wire that grounds the door module. Repaired the ground and all is well. Thanks again for all the help!	6
	1999 Chevrolet Malibu 3.1L Poor Idle Quality, Poor Fuel Economy I disconnected the knock sensor to prevent the computer from retarding the timing. The vehicle still has a spark knock and the check engine light is on for the knock sensor being disconnected.The knock sensor is not bad it is doing its job, because the engine ...	4
	2004 Chevrolet TrailBlazer 4.2L blower motor the problem with the car was the rear controller thanks to all who responded. after testing the rear resistor i could not find anything wrong with it so i replaced the rear fan switch and that fixed the problem .	2
	2004 Chevrolet Corvette 5.7L Sensor I think I may have jumped the gun. originally I tried resetting, with magnet, and it stopped on the fourth wheel (the one in question) so i replaced sensor, and looked for it to register on my scan tool. it did,nt. that is when i wrote this. I decided to try a...	4
	1983 GMC S15 Jimmy 2.8L No Start The customer had failed to tell me that the pigtail connector for the coil had been replaced by himself, and i traced it down to; The wires were crossed for the power to the module; Thank for everybodys help;	7
	1998 GMC Jimmy 4.3L Poor Idle Quality, Hesitation, knocking at cruise thanks for all who replaied to me , I checked the fuel Pressure found it out fo spec so I replaced the fuel Pump and the engine run great , thanks to all	5
	2003 Hummer H2 6.0L ride control Thanks to all for the info.I cleaned all contacts at motor and module,problem was inter.but so far so good.thanks again,DENNIS	5
	2005 Pontiac Sunfire 2.2L aftermkt. cruise cont. Thank you to my friends that replied. I did check with Audiovox, had to get their "correct" phone number from their web site ([...]. They are in New York so 3 hour time difference for me on the West coast. Tech support said to tap into the "non common" ...	3

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