GM Automotive Technicians Technical Discussion and Fixes for May 5, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1991 Buick Park Avenue 3.8L battery VIN: 1G4W53L1M1 battery is being drained while vehicle is off, there is a draw which goes away when the 40 amp fuse marked "ip" is removed. any assistance would be greatly appreciated. thanks.	View
	1995 Buick Park Avenue 3.8L belt VIN: 13C5464K4S Hello everyone, let me thank you in advance for any help.When I first test drove this car I thought it had a supercharger and that was making niose. When I popped the hood and saw that it did not I wanted to look closer because it came in for something else. T...	View
	1996 Buick LeSabre Limited 3.8L a/c air controls VIN: 1G4HR52K8T I replaced evap and recharged a/c system. After the repair the custormer informed me that the air was not coming from the center and side ducts. I scaned date and had a code 41 air door mix problem. I tested the programer with info from all-data and tested bad...	View
	1967 Cadillac deville 429CID directional switch VIN: F7100736CA tHIS CAR HAS A LOCK TAB BROKEN IN DIRECTIONAL SWITCH HAVE LOOKED EVERYWHERE FOR SWITCH. ANY HELP IN LOCATING A NEW OR USED SWITCH WOULD BE VERY HELPFUL.. IF IT MATTERS THIS CAR HAS A TELESCOPING STEERING COLUMN. THANKS MUCH.	View
	1988 Chevrolet S10 Blazer 2.8L No Start VIN: 1G8CS13R8G I have this 89 Blazer that has no injector pulse while cranking. I have no vrefpulse on the scanner while cranking but it is picking up RPM refrence while the engine is running. You can spray the TBI and it will fire right off and run all day long but it will ... Trouble codes: 24 (no vss), 32 (egr fault), 53 (fuel pump relay open), 45 (rich)	View
	1996 Chevrolet Tahoe 5.7L left front output shaft diff) Has anyone ever encountered the "stuck" left output shaft on the front differential. I removed the entire diff and even used a slide hammer, it will not BUDGE! The passenger side practically fell out. Customer is questioning my ability, (so am I)anyone HELP!	View
	1998 Chevrolet K1500 Cheyenne 5.7L 4wd VIN: 2GCEK19RXW Hello everyone,the 4wd will not engage if I select 4hi or 4lo ,led on switch will flash for longer than normal and no engagement.I have same year Tahoe and borrowed the 4wd switch and module from this vehicle,same symptoms.I've checked all fuses and grounds an...	View
	1999 Chevrolet Express 3500 5.7L front calipers VIN: 1GBJG31RZX help, I picked up account, need to get this fixed, pulls left when braking, I've replaced everything but abs actuator(see history), seems like right caliper not applying enougth pressure, I've done abs stops and bled system, probably 15 times, the lines from t...	View
	2000 Chevrolet Astro 4.3L trans/abs? VIN: 1GNEL19W3Y This van came in for a brake job, which we did but the customer said it was skidding and clunking. Test drove and it clunks quite hard sometimes when braking and makes a short skid. This is different than when the abs engages. checked all wheels for loose part...	View
	1989 Oldsmobile Cutlass Ciera 3.3L rear brake shoes VIN: 1G3AJ51N3K when customer first came in, the complaint was rear brake noise and a drag as though the brakes never disengage. It was determined by the technician that the noise was caused by the brakes being locked and that replacing the master cylinder and proportioning v...	View
	1992 Oldsmobile Achieva S 2.3L No Start VIN: 1G3NL1430N This car came in on the end of a chain(WE don't use wreckers here):). any way it won't start. it tries, it will backfire in the exhaust and the intake. acts like flooded but not. The scanneer shows no rpm sig. while cranking. I checked the crank pos. sensor. I...	View
	1995 Oldsmobile Cutlass Supreme SL 3.1L ABS lite and Brake lite on at same time VIN: 1G3WH52M5S This car came in for rear brakes. The brake calipers were stuck. The brakes worked at one time, because the brake pads were worn out. I replaced the calipers and brake pads.I had a tough time bleeding the brakes. I'm aware of the check valves closing off the p...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1990 Cadillac DeVille 4.5L Excessive Emissions VIN: 1G6CD1337L Thanks to all suggestions, vehicle passed with flying colors, as suggested by many, I cleaned the egr jets which are visible below throttle body, retarded timing to 6 deg instead of 10deg as suggested by gm bulletin, drove vehicle longer to get new cat operati... Trouble codes: 49 (thermactor air problem).	10
	1992 Chevrolet G20 Sportvan 5.7L Excessive Emissions, Hesitation VIN: 2GGEG25K7N Thanks to all who responded so quickly this van is repaired! It seems I might have been the only one who didnt understand fully how this system operates. The ecm commands the vacuum solenoid on when coolant temp is above 25 degrees centigrade, trans is not in ...	14
	1996 Chevrolet Lumina 3.1L Misfire, MIL Lamp on VIN: 2G1WL52MXT After extensive testing and then part swapping, the vehicle is gone but probably will be back. Let me go over the majority of the replies. Some said EGR sticking open, intake gaskets leaking, pressure regulator leaking, Map sensor glitching but not setting a c... Trouble codes: P0300.	24
	1998 Chevrolet Malibu 3.1L cooling fans VIN: 1G1ND52M4W Thanks Guys for all your assistance, after letting the vehicle run the fans did come on at around 225 degrees as all of you said, so it appears as the vehicle is performing within specs (go GM) thank you all once again for your assistance, you Guys are great	13
	1997 GMC C1500 Sierra GT 4.3L Surge, Misfire, MIL Lamp on VIN: 1GTEC14W9V the customer declined any further repairs to this vehicle so unfortunately we do not have any idea what is wrong with this vehicle. thank you anyways for all the ideas we received. Trouble codes: P0300 (random misfire detected).	14
	2001 GMC Sonoma SL 4.3L MIL Lamp on VIN: 1GTDT19W71 great responses! 30 amp fuse blown under/behind battery. air pump siezed. replaced and blew out check valves.good place for a fuse panel huh? Thanks for all the help. Trouble codes: P0410.	8
	1997 Oldsmobile Cutlass 3.1L hard start VIN: 1G3NB52M9V I had installed niehoff injectors, they looked diffrent a little taller than originals, but since all six were being replaced, I made the call,Now I removed the six and installed six new from factory, vehicle still cranked a little before starting but not like...	8
	1998 Saturn SL2 1.9L oil consumption VIN: 1G8ZK5270W the customer did not want to fix the problem at this time. this summer he will have me try the top end cleaner suggested by many of the replies. if that doesn't work i'll tear down the motor and clean the rings and clynders as suggested. thanks for all the rep...	26

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