GM Automotive Technicians Technical Discussion and Fixes for Jan 16, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1990 Buick Electra Park Avenue 3.8L No Start VIN: 1G4CW54C7L this car does this at least once a year gets colder out and it won't start.warm it up starts sounds flooded clears up and it fine.plugs and wires have been changed . last years episode took an injecter to fix.Couldn't condem any injecters this time.Fired it up...	View
	1997 Buick LeSabre Limited 3.8L Poor Idle Quality, Misfire VIN: 1G4HR52K6V Misfires @ idle. Ran DTC= PO300= Misfire. Replaced plugs, wires, coils & ICM. Still has misfire @ 3,4 & 6. Ran DTC again= PO300. Runs fine @ higher RPM's. What can we eliminate based on results? Trouble codes: P0300	View
	1998 Buick Park Avenue 3.8L engine VIN: 1G4CW52KXW This vehicle came in on hook...overheated & locked up with a leaking water pump. We installed a rebuilt long block assy from a major engine rebuilder. Customer says no vibration before the repairs.After checking for errors in installation, we replaced the firs...	View
	1977 Chevrolet K20 Cheyenne 5.7L 2 Wheel Drive Hello Members, This truck belongs to a buddy. He changed the truck over from a 2 wheel to a 4 wheel. The truck is equipped with a NP 205 "Gear to Gear" T-Case. The truck works in 4 wheel only. Upon placing the T-Case into 2 wheel it slips out with a real nice...	View
	1990 Chevrolet V1500 Suburban Scottsdale 5.7L speedometer VIN: 1GBEV16K4L we had a customer bring in his 90 surb with a complaint of no speedometer said it just quit on him . we then start checking vss got a good signal output to drac (vss working ok ) checked the power and ground to drac that also checked out ok we then had the ins...	View
	1994 Chevrolet Camaro 3.4L Misfire, vibration VIN: 2G1FP22S6R Hey, it's been along time since a GM has pulled my hair out. This car came from another shop for misfire on #1.After finding that wires were bad I replaced. Under load at 2200 rpm and up there is a bad vibration & 0r misfire. I can't confirm misfire. I have te...	View
	1995 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W7S vechile came in on hook crank no start have spark and fuel pressure 60 psi has no injector pulse after a few hours of testing and inspecting started on its own cant seem to get to stall anymore third time for this problem in 6 months crank signal appears to be... Trouble codes: 1351 (ref voltage high)	View
	1996 Chevrolet C1500 Suburban LS 5.7L Misfire, MIL Lamp on VIN: 1GNEC16R3T Hi everybody, got this 96 suburban with a dead miss at idle. should be an easy diagnosis but am having a difficult time anyway. Missfire monitor shows number 5 cylinder skipping non stop at idle and seems to go away with throttle. Customer originaly declined d... Trouble codes: P0305, P0300	View
	1997 Chevrolet K1500 4.3L Stall VIN: IGCEK14W5V Hi guys and girls.I need a liitle help on this one.Customer came in with complain of periodic stall.We changed the ign switch because of related bulletin.Truck was good for a week and then -I'm back,stopped 3 times on the way home.Engine runs good otherwise.Do...	View
	1997 Chevrolet Venture 3.4L oil pressure VIN: 1GNDX06E2V Vehicle towed in with large oil leak. Discovered gasket on oil filter blown out. Was not OE. Replaced with NAPA and retried. Within 3-5 sec. new filter seal blown out. Vehicle has lite, so put in manuel guage and replaced with OE (GM) oil filter. It also blew ...	View
	2001 Chevrolet Workhorse 6.5L Engine VIN: 5B4KP42Y21 This is a Postal vehicle. The problem is very intermittent. The truck has had this problem since it was new. Please don't immediately suggest taking this truck to a dealer. We don't always have the best luck there. After the vehicle is fully warmed up and the ...	View
	2001 Chevrolet Astro 4.3L Hesitation, Surge VIN: 1GCDM19W01 This van exhibits a severe loss of power at 3/4 throttle going up a hill only under a load. Vehicle runs great around town. If you back off the throttle while this occuring and hit it again the problem typically goes away. No problems are noted upon start up. ... Trouble codes: 300 (random misfire)	View
	2003 Chevrolet Suburban 2500 LT 6.0L driver memory VIN: 3GNGK26U93 Hello GM Techs. My customer has asked me to install a set of aftermarket mirrors (Power Vision) and remove his O.E. folding mirrors. He bought this truck late in 2003 and the extending mirror was not available at the time of his purchase. According to the inst...	View
	1995 Oldsmobile Achieva S 2.3L No Start VIN: 1G3NLSSD9S Hopefully some GM guys can help. This is the 3rd time car left customer sit. 1st time we had good fuel pressure but no spark and no injector pulse. Went through snappy scanner and tapped into purple white wire, and could fire injector. So we replaced the ICM. ...	View
	1996 Oldsmobile Cutlass Ciera 3.1L Valve train VIN: 1G3AJ55MXT The lifters did not clear out. The valve train is loud enough for the knock sensor to bump the timing back over 20 degrees. I torqued all related parts to spec and made sure the engine was kept clean during the work. I've never run into this before and was hop...	View
	1990 Pontiac Grand Am LE 2.5L Excessive Emissions, Poor Idle Quality VIN: 1G2NE14UOL engine runs rich, no codes, all sensors within perameters. ignition system test, good spark, good ignition pattern. fuel integrater goes to 65 when throttle open, replaced injector and cranksensor. no different, simutec shows mat sensor out or range but scanne...	View
	1992 Pontiac Sunbird LE Value Leader 2.0L No Start VIN: 1G2JC51H2N Hi gang. This car was towed in, no start. On first look the starter drive does not engage. No sweat, put on a starter. Now the fun starts. Cranks good. Got good spark, New plugs today (they were old), got injector pulse (I only checked on cylinder four), good ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Buick LeSabre Custom 3.8L MIL Lamp on thanks for all the help the prom turned out to be the problem Trouble codes: P0325.	7
	1997 Buick Park Avenue 3.8L data bus VIN: 1G4CW52K5V Thank you, to all who replied. Everyone had some good ideas.I went back and checked all powers and grounds, to any thing that is on that data bus,and found no problems. I don't think the master tech was providing a ground, because I didn't have it plugged into...	12
	1994 Chevrolet Camaro 3.4L ABS Lite VIN: 2G1FP22S4R Some of the replies i received just kind of verified some of the things we were trying to duplicate. The Customer wants to pick up this vehicle without wanting to give us an opportunity to try to duplicate the condition with our test equipment hooked up. Very ...	3
	1995 Chevrolet K1500 5.7L Abs Module VIN: 2GCEK19K0S I want to thank everyone that responded and almost all of you said the sensor was pushed up with rust and both of them was.I replaced both hubs and also put new rotors and ceramic pads and it stops great. Thanks again everyone your great	14
	1996 Chevrolet Blazer 4.3L No signal to comp VIN: 1GNDT13W7T We'll thanks to several correct help suggestions. My electric problem was the trans. A Jasper Reman unit and the truck gets to go home. I did a suggested one minute check of the pump. The trans dip stick level did not change from truck off to truck running. Ge...	9
	2000 Chevrolet Prizm 1.8L engine VIN: 1Y1SK5285Y Well, not much to offer on this vehicle. Customer came in and we could not duplicate the noise. He took it and on another day called to have me listen over the phone to his noise. I could not hear it over the phone. He later stopped in and it was doing it. In ...	4
	2000 Chevrolet Blazer LS 4.3L No Start, Stall VIN: 1GKDT13W1Y Finally we got this thing fixed, thanks to Dave from Virginia who nailed it by putting me on the trail of TSB # 01-08-56-001A which was to repair intermittent no start- security light flashes while cranking. The problem was the connection of the ignition switc...	21
	1997 GMC Sonoma SL 2.2L no-start damp mornings VIN: 1GTCS1445V most replies pointed to ign module/replace wires again(coil packs customer is away on business & will contct me when he returns if there is any new info I will pass it along.Appreciate all the replies but no fix as of yet.When he returns and I get another shot...	11
	1999 GMC Savana 3500 5.7L rear shoes VIN: 1GDH31ROX1 i ck'ed all the e brake cables again all are fine and adjusted properly when it left here it did not have any brake drag on rear wheels even after e brake was applied and released. this bus had to go back into service so we put new shoes again. when it comes b...	11
	1999 Pontiac Grand Prix GTP 3.8L Misfire, MIL Lamp on VIN: 1G2WR1216X Problem actually was a bad 'new' spark plug wire on #1 cylinder. What actually compounded the problem was at 4,000 rpms engine would misfire badly. Unknown to us & no information was found anywhere, not even All Data, was that apparently there is a rev limiter... Trouble codes: P0300.	9
	2000 Pontiac Grand Am SE 2.4L engine missfire VIN: 1G2NF52T7Y thank you all!i fixed this turkey,i waited some time to post-wanted to be sure,she told me that the injectors were replaced 6 months ago and $250 a month in fuel-for just around town driving?? well the computer took a hike and i replaced it-many replied about ...	11

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