GM Automotive Technicians Technical Discussion and Fixes for Mar 31, 2006 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1987 Cadillac DeVille 4.1L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1G6CD1189H got a good one here guys and girls. car came in from another shop, cuts out will not idle. start car up you have to feather gas to keep running give it to much fuel and car dies. if you spay carb cleaner down throttle body car runs perfect. fuel psi 12psi good... Trouble codes: 53 (distributor signal interupted), 52 (ecm long term memory reset)	View
	2002 Cadillac Escalade 6.0L abs VIN: 1GYEK63N42 Hi everybody : This is my boss's wife car. abs will sometimes kicks in when the vehicle moving at about 10 kms and come to a stop. Check for DTC got 4 out but I can't remember,but none of them is relate to the wheel speed sensor. We put 2 front wheel speed s...	View
	1988 Chevrolet G30 Hi-Cube 5.7L No down shift VIN: 2GBHG31K0J This is an Army truck and yes the milage is correct. There is no down shift. The theroy I read stated when you floor the gas the MAP voltage goes high and then the PCM grounds the down shift relay and puts 12volts to the solenoid. The data stream shows the MAP...	View
	1991 Chevrolet C1500 Cheyenne 4.3L Poor Idle Quality, Stall VIN: 1GCEC14Z3M The truck runs well, idles smoothly in park, but will not idle in gear. Scan tool shows IAC counts drop when shifter moves from park position. IAC counts 27 at idle in park, but slowly drop when PRNDL switch moves. Does not require trans gear engagement to ach...	View
	1997 Chevrolet C1500 5.7L rear brake lights VIN: R3V1567807 This problem truck came to me with no brake lights on as soon as you apply the brake , the fuse blows.Hazard lights work well until you touch the brake,an aftermarket trailer brake controller was installed so I immediatley disconnected it to see if it was the ...	View
	1998 Chevrolet Lumina 3.1L parking/brake lights VIN: 2G1WL152M2 This car has no rear parking lights, no signal lights, no brake lights, but the third brake light is working only. Customer has replaced the brake switch and the tail light bulbs and still the same problem. Any idea what cause that? I'm thinking the problem is...	View
	1999 Chevrolet Tracker 2.0L engine VIN: 2CNBJ13C5X Hello, thanks for any assistance that you might offer. This vehicle has been maintained by the book and the engine oil used has always been valvoline 5W30 synthetic. The vehicle is towed behind a motor home once a year in summer to the Rockies from Manitoba....	View
	2003 GMC C7500 6.6L Fuel,Oil,Volt, Temp Gages VIN: 1GDK7J1CX3 This Vehicle has no Temp,Volt,Oil.or Fuel gage Function,Tachometer works aswell as Speedometer,Vehicle was repaired at GM Dealer,along with another Truck of this Series,with Same problem. Was told fix was a Bad Connection;ie(Ground) wasn't specific. Based on m...	View
	1998 Oldsmobile LSS 3.8L noise VIN: 1G3HY52Y5W this car came in with high pitch screech coming from the area of the torque converter checked for end play in crank none found no fluid leaks pulled the transmission out replaced converter with rebuilt from gm had the trans pulled apart by local transmission m...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1989 Cadillac DeVille 4.5L Poor Idle Quality, Hesitation, Surge, Stall, Misfire VIN: 1G6CD5156K Thanks for the info!!! problem was the ground next to the starter, i relocated it used a couple of star washers and it purrs like a kitty..	13
	1989 Chevrolet R3500 Cheyenne 5.7L Cuts out, Misfire VIN: 1GBHR34K9K will this one is fixed, thanks for the help i recieved, checked ground wires at the computer and one had 6.5 resistance, that would be the one on the back of the head, cleaned and went to 0.1 back fire was gone. my man cleaned the ones on the intake but not th...	48
	1991 Chevrolet K2500 Cheyenne 4.3L hvac module VIN: 2GCFK19Z8M well ended up being two wires down by he starter had rubbed together for 215,000 miles. and finaly rubbed through. thank you all for the suggestions. Ron [...]	5
	1998 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1GNDT13W5W This vehcle needed a fuel injector very badly. Apparently the pop off valves developed an uncontrollable leak and were dumping fuel. The MAP sesnsor also appeared to be partially clogged. I cleared the blockage, installed the injector and gave the the 'Offical... Trouble codes: P0300 (Random misfire), P0108 (MAP circuit voltage high).	13
	2003 Chevrolet Trailblazer LTZ 4.2L air flow VIN: 1GNDS13S23 Thanks for the replies. It ended up being the AC/heater mode door motor. WE followed the flow chart to find it. We were concetrating on the motor reset proceedure because the customer said the problem started after her ignition switch went bad. This could have...	5
	1995 GMC K2500 Sierra SL 5.7L No Start VIN: 2GCEK29RXT Hi all techs : Only 3 replies on this one,I spent another 3 hrs with another mechanic still can't make this truck running,and we have other cars to work on. We have to put this one on hold for now. Thank you for helping	4
	1996 Oldsmobile 88 Royale 3.8L Unknown VIN: 1G3HN52K6T thanks techs the vehicle is fixed most of the replies sent me to the pcv system that is were the problem was found the small o ring on the pcv valve was in fact left out, replaced pcv valve and the small o ring car runs fine that was a costly mistake but thank...	39
	1995 Pontiac Grand Prix GTP 3.4L brake pedal VIN: 1G2WJ12X3S YES,I have fixed this vehicle!As noted by several of you,I had 2 rear calipers fail,the slides were fine,though.I clamped off the brake lines and released 1 at a time,but it was kinda difficult due to 2 being frozen.They actually clamped down on rotors,but onl...	10
	2000 Saturn SL2 1.9L trans temp VIN: 1G8ZK5279Y Saturn is fixed! Most reply were right on target..esp Ernest who nailed every issue. We found coolant sensor was leaking fluid & coroding terminals..sending false tempurature reading. As a point of info, this was also causing a intermitant no start...touching ...	7
	2001 Saturn L200 2.2L rear VIN: 1G8JU52F41 I think I have this one fixed, or at least found the culprit, it was an outer lower control arm bushing, I had taken all control arms loose from the spindle and found one that was very difficult to move, it is basically designed like a ball joint with a bolt t...	2

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