GM Automotive Technicians Technical Discussion and Fixes for Dec 18, 2006 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1993 Buick Regal 3.1L Stall, Misfire VIN: 2G4WB54T5M Vehicle came in with no idle, and a backfire . We got it to idle long enough to do a propane test. We detected a vaccum leak. We replaced the intake manifold gaskets and replaced spark plugs. Now the vehicle wont start, still backfires. We have preformed a com...	View
	1992 Chevrolet K1500 Cheyenne 5.7L A/C Light Flashing VIN: 1GCEK14K6N I need some help on this one guys. This is a 1992 Chevy K1500 customer first brought it in with a complaint of an A/C light flashing and his A/C inop. I disconnected the battery to clear the controller and proceeded to check the system, all seemed fine, pressu...	View
	1998 Chevrolet Camaro 3.8L No Start, Hesitation VIN: 2G1FP22KXW customer states car leaves her stranded.always starts for me.all i feel is a fish bite at times.clear codes and ckp and purge driver codes come back almost every time.believe the two are related to no start and hard surge.but how. Trouble codes: P0336, P1676	View
	2000 Chevrolet K3500 7.4L 4-wheel drive VIN: 1GCHK33JXY Complaint of four wheel drive not working--front axle not engaging. Found the problem to be a defective timer logic &relay module which is located roughly on the center of the firewall behind the engine. My problem is that the original module is/was missing an...	View
	2004 Chevrolet Silverado 2500 HD 6.0L oil pressure gauge VIN: 1WHEJ456WR Hi there, I have this 2500 Silverado HD with the Oil Pressure Gauge pegged high. I have found a TSB on Mitchell's showing problematic sending units causing issues with incorrect oil prssure readings. I tried a new AC Delco sending unit per TSB. By just pluggin...	View
	1986 GMC K1500 High Sierra 5.0L trans/tcase VIN: 2GTEK14H1G hi were in the northwood with 1 trans shop.(gone hunting) this truck is intermintant problum. truck won't move in any gear. cold, hot, 1st start or after driving seems to make no diff. it happened to me 1 time and truck won't move in any gear. but when i tryed...	View
	1987 Oldsmobile 98 Regency Brougham 3.8L No Start VIN: 1G3CW5136H I may have jumped the gun on this one. This 3.8 was running poorly and then quit and would not start. The owner parked it and let it sit a few months. I put a battery in because the old one would not charge. Engine cranked ok. I grabbed a fuel pressure gauge a...	View
	2000 Oldsmobile Intrigue GL 3.5L Cuts out, Stall VIN: 1G3WS52H6Y this vehicle has come in for an intermittent stalling problem. the owner states that the engine has stalled on him driving down the interstate, and sometimes has a crank-no start condition. after a try or two, it will sart right up as if there is no problem. f... Trouble codes: P1189 (oil pressure switch ckt open/ short)	View
	2001 Pontiac Grand Prix GT 3.8L abs VIN: 1G2WP12K01 This vehicle makes a abs growl similar to the gm pickup truck abs sensor that needs cleaning. Happens at low speed. Have had this car in the shop 5 times with same problem. The last time a c0036 code was set. We replaced the left front hub assembly. Two weeks ...	View
	2002 Pontiac Montana 3.4L 4th gear VIN: 1GMDX03E92 this montana has no trouble codes stored and no trouble codes in its history. i don't do trans rebuilds, but this is a regular client and i would like to try and help him. this van shifts perfectly all the time. the only problem is no 4th gear. they client onl...	View
	2002 Saturn L300 3.0L Center dash vents VIN: 1G8JW54R52 Hello fellow Techs, I have this Saturn with no air from the center vents, either with heat or a/c. The end vents on the dash have air coming through, but not the center vents. I assume these are electrically operated, as there are no vacuum lines to the firew...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1994 Buick LeSabre Limited 3.8L Surge VIN: 1G4HR52L3R I can't thank members of the IATN team enough. Most everyone pointed out one of three areas that cause this problem. One was the PCM, the other was chafed wiring, and the other was balancer problems. I took the easy routes first and looked at the wiring everyo... Trouble codes: P0321.	28
	1990 Cadillac Seville 4.5L Misfire VIN: 1G6KS5331L Well Guys I am going to put this on the back burner for awhile, until I get caught up to start in on it again, Thanks for all the great hints. We will look into all of them, some we aready have and found nothing wrong, EGR was O.K. Injector was O.K. must be in...	25
	1991 Cadillac DeVille 4.9L Electronic VIN: 1G6CD53B8M This was a strange one. It ended up being a loose connector at the bcm. We replaced the female connectors we thought were giving us trouble. It still acted up. We finally twisted the harness so as to keep tension on the connector. Now the blower works every ti...	5
	1987 Chevrolet S10 2.5L Oil pan leaks VIN: 1GCBS14E0H I knew I would get pelted with so many responses from my oil pan issue with this truck. I can safely say this is fixed. I took all of your guys suggestions on not removing the engine. It is not the best method to lay on your back to yank a pan down but it sure...	29
	1996 Chevrolet C1500 Suburban 5.7L Driveline noise Thanks everyone. Most replies targeted the driveshaft or driveshaft bushing. All weights were present on driveshaft. I ended up pulling the rear driveshaft out and driving down the highway in 4HI, noise is gone. Could not see any bends or visual damage to driv...	10
	1999 Chevrolet K3500 6.5L Driveline VIN: 1GCHK33F4X sorry for not closing this sooner, this truck is a second vehicle to my customer and our shop has been very busy. after driving more and more a noise started in the LF traced to outer joint of my recently replaced axle shaft. dissassembled to get a look found ...	18
	2000 Chevrolet Impala 3.8L MIL Lamp on VIN: 2G1WF55K9Y I did recieve some replies and I was going to change the fuel pressure sensor however the car belonging to the state they decided to turn it in to the motor pool and see what they want to do with it. Trouble codes: P0440.	7
	2002 Chevrolet Silverado 1500 HD LS 6.0L abs VIN: 1GCGC13U62 This vehicle is fixed and has been picked up. The Tech 2 records very fast and when doing play back on the computer we never saw any drop outs in any speed sensors. We performed the cleaning of the front speed sensor mounting surfaces and the ends of the senso...	13
	2003 Chevrolet Silverado 3500 6.0L No Start VIN: 1GBJC34V63 This truck came in late Friday and I did some diagnosing on it.I was unfamiliar with how the dual tank set up worked with no switch to change tanks.I did power up both pumps and they did work(direct with booster pack)when I did a key on with someone turning th...	6
	2005 Chevrolet Monte Carlo LT 3.8L no heat VIN: 2G1WX15K04 Thanks to all that responded to our no heat problem,this car belongs to one of my techs and is happy now that its over.The problem was no flow to heater core via the little plastic elbow that goes thru the tensioner bracket.When the elbow was molded there wa...	10
	2003 Oldsmobile Alero GL 3.4L starter VIN: 1G3NL52E93 Replaced Ignition Lock Cylinder for the Passlock 2 System,and then relearn the new Lock Cylinder	9
	1990 Pontiac Grand Prix Mclaren 3.1L steering control VIN: 1G5WP14V9L Was able to verify that the rear upper strut mounts were loose. Didn't seem to have any play, but if you watched closely while someone drove by turning the steering from side to side, you could see it.	16
	1995 Pontiac Grand Prix SE 3.1L MIL Lamp on VIN: 1G2WJ12M1S Hello my fellow techs, this grand prix is fixed and I think I still have some brains left??? Many Many thanks to Jay,Doug,James,Pat and Loren in suggesting to double check to make sure the Intake passage is real clean, Well I have to admit that this is my faul... Trouble codes: 77 (EGR Solenoid 3 Error).	11
	1995 Saturn SL2 1.9L Cylinder # 3 VIN: 1G8ZK5274S Hi Thanks I received several different replies but I had already eliminated most of them. 2 people informed me that oil leaking past the rings in one cylinder can cause carbon build up on the exhaust valves that then can create a hot spot that will burn the va...	10
	2003 Saturn Ion-3 2.2L ignition VIN: 1G8AL52F63 we replace the ignition pass lock switch with a second onefrom the dealer andthe car started right up with out reprogramming. the part we replaced is the little box that the actual ignition switch plugs into. it is a 8-10 pin box, part 3 is in original help po...	16

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