GM Automotive Technicians Technical Discussion and Fixes for Feb 28, 2006 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1999 Buick Regal GS 3.8L Misfire, Excessive plug wear VIN: 2G4WF5214X What I have here is a 3.8 supercharged with no running problems inidicated when driving until plug tip is burnt off, then will start misfiring. What I have found out is that the plugs were replaced once (500 miles ago) prior to coming to me with a new mass air... Trouble codes: P0300	View
	1998 Cadillac Seville STS 4.6L battery VIN: 1G6KY5492W This cadillac is drawing 3.8 amps and flattening the battery.I removed fuse 63 from the fuse box under the seat (amp)and it dropped to 2amps.I then removed fuse # 7 from the fuse box under the bonnet and it fixed the rest of the current draw.I need to no what ...	View
	1999 Cadillac Catera 3.0L air bag VIN: WO6VR52R2X The battery was dead, customer hooked up a small battery charger to start. After the engine started Air Bag light was on and stayed on while running. I Cannot find any information on how to diagnoise the problem. Need help on this one.	View
	1991 Chevrolet Camaro RS 5.0L Poor Idle Quality, Hesitation, MIL Lamp on VIN: 1G1FP23EXM I am dealing w/ a Camaro that doesn't want to stay fixed. About 6 months ago it developed a lack of power on accel w/ intermittent rough idle. This was accompanied by code 42 for EST. This was repaired w/ replacement of ECM and PROM(both GM parts) and a knock ...	View
	1992 Chevrolet S10 Blazer 4.3L module VIN: 1GKDT13WGN this lady lives two miles down a dirt road twenty miles from town. she comes to town every day. she always puts it in 4wd to drive on the dirt (even on the 4th of july) and two on the paved. about every 2 months the module goes bad...won't even blink the light...	View
	1996 Chevrolet S10 4.3L Hesitation VIN: IGCCS14X5T Cleared codes and non have retured while test driving. Thought problem might just be related to fuel pump as this is so common on this motor, CPI, lots of posts with my problems fixed by FP replacement. Truck feels like it has a slight miss while going down th... Trouble codes: P0300 (misfire detected), P0420, P1441 (evap system flow during non-purge)	View
	1997 Chevrolet Cavalier LS 2.4L Misfire VIN: 4G1JF32T1V Here's the deal customer brought us this 97 cavalier they had just purchased. It was running bad and check engine light was on. I scanned it to find the above codes... first thing I found was a broken vacuum hose to the MAP sensor. I repaired it cleared the co... Trouble codes: P0300, P0172, P0106	View
	1999 Chevrolet Cavalier 2.2L valves VIN: 1G1JC5246X hello, car came in for rough running,took compression ck,two cyls.no compression.removed head , 2 bent valves,removed timing cover ,ck chain,ok,head done over,replaced lifters,drove around for a day,ran great,customer took car,4 days later.car back in for roug...	View
	1999 Chevrolet C6500 7.4L tank runs dry VIN: 1GBJ7H1BXX This big truck is back, the left tank keeps going dry, and the right tank stays full, not transferring fuel over. Last time I worked on it the right transfer pump was bad, replaced it and the fuel control module & relay, and got fuel pumping out of the right t...	View
	2000 Chevrolet Silverado 1500 5.3L steering rack? VIN: 1GCEK19T9Y This truck has asqueal that sounds just like abelt squeal. Replaced both belts, has a seperate ac belt, checked pulley alinement and could not feel anything wrong.A week later squeal came back, replaced belts again, with amajor brand name, still noisy, but ver...	View
	2000 Chevrolet Silverado 1500 5.3L Thermostat? VIN: 2GCEK19T6X Hi all, We replaced the water pump on this truck due to milage and leaking water pump gaskets. We are in Texas, when we finally got a cool snap, customer complained of no heat. Engine is running 175 deg with a ambient of 70 deg, less when it is cooler. We orig...	View
	2001 Chevrolet Express 3500 6.5L fuel VIN: 1GCHG35F51 Customer complaint of check engine lamp on and hard start with lots of white smoke. 1St off replaced fuel filter and road tested. I fixed PO335, a visual inspection found the crank sensor harness bad. PO1870 is overdrive is bad. Truck is going to trans shop ne...	View
	2002 Chevrolet Suburban 1500 LT 5.3L 1-2 shift VIN: 1GNFK16Z72 we have a 4l60 trans with a 1-2 hard upshift(bangs). that is the only time you feel the bang shift is doing the 1 -2 upshift - you do not feel it in any other gear or on downshift. we serviced trans and installed new pan gasket and filter. there was no metal i...	View
	1995 GMC C1500 Sierra SL 5.0L Unknown VIN: 1GTEC14H5S Customer states the transmission was just rebuilt. Before the rebuild, The trans would'nt shift out of first gear. When the trans would'nt shift, the tach and speedo were not working at the same time. When the speedo, and tach start working, the trans shifts o...	View
	2004 GMC Sierra 2500 6.0L temp. control VIN: 1GTGC23U34 Hello everyone this vehicle has manual HVAC with seperate temp. Controls for the driver and passenger side. The problem is that the drivers side temp. Only works properly on full hot and full cold position only. Moving the lever slightly down will convert to c...	View
	1995 Oldsmobile Aurora 4.0L Speedometer VIN: 1G3GR62CXS Hello Fellow Techs. Todays diagnostic dilemma comes from a 1995 Olds Aurora. The customer complains of an erratic Speedometer. I verified this by test driving the vehicle along with my scanner riding shotgun. The Vehicle Speed Sensor (VSS) on the datastream ...	View
	1995 Oldsmobile Cutlass Supreme SL 3.4L Poor Idle Quality, Idle Fluctuation VIN: 1G3WH12X6S There are no diagnostic code present. Upon initial check up, vehicle had a major vacuum leak at vacuum hose near rear engine compartment area. Corrected vacuum leak and also performed tune-up service, as maintenance requirment. Vehicle still has a idle fluctua...	View
	1996 Pontiac Grand Am SE 3.1L Surge, Misfire VIN: 1G2NMW12M7 Bad intermittent miss fire. Most on cyl #5. Has a bad surge Idle up and down. No vac leak can be found. We have heard this could be a cam sensor problem? Trouble codes: P0300 (missfire bad surge)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1991 Buick Park Avenue 3.8L Lighting VIN: 1G4CW53L3M Firstly thankyou all for all of the infomative information. This one had me beat. I had every door taken apart with switches disconnected but the lights were still on, I checked the RAC module as was suggested, the white wire WAS grounded but now the problem w...	18
	1998 Buick Century Custom 3.1L water in oil many thanks to all who replied, this one was a really weird case. after we had the heads checked (they were warped by the way) a friend of mine at the machine shop asked me to bring him the old head gaskets, since he's only 4 blocks away i agreed to bring them...	34
	1992 Cadillac DeVille 4.9L stop,tail,and turn signal lights VIN: 1G6CD53B5N Wow, did we have fun! Thanks for all the replies. Mitchell from California, said to check for pinched wires and wires in wrong places. The AC compressor was found to be unhooked, connector missing but taped off. Pulled AC compressor wires out of the harness an...	9
	1993 Cadillac Seville STS 4.6L Cylinder heads VIN: 1G6KY5292P Hi everyone, first let me say this is a STS and not a Deville. To begin with my boss decided this was like taking apart any other engine and he was the one that screwed up and not listening me. After I showed him some of the replies about what was involved to ...	20
	1997 Cadillac DeVille 4.6L Cuts out, Stall VIN: 1G6KD52Y1V Well I want to thank everyone who has reponded to my cry for help. We applied all the sugestions from the 13 who took the time to help.We took another look at the brand new crank sensors and ignition wires,We checked the battery cables and relay box for loose ...	13
	1999 Cadillac Catera 3.0L MIL Lamp on VIN: W06VR52RXX Thank you all for you replies. I replaced the electronic traction and brake control module as suggested and it did fix the problem. The traction control, abs, and check engine light reset. The speedometer also began functioning. Thanks for all your help. Trouble codes: U2108 (can bus error abs), P1700 (transmission fault has occured), P0500.	5
	2001 Cadillac Catera 3.0L Cooling Systems VIN: W06VR54R71 Thanks for the replys. All but one confirmed what I thought. Just a moisture build up during the winter. I have seen this on the older GM's that used a tube type set up. I have talked with the customer, and he is ok with this also. He does have a 1 year warran...	6
	1989 Chevrolet C3500 Cheyenne 7.4L Poor Idle Quality VIN: 1GCGC34N6K I am Happy to report, this vehicle is fixed. this engine a big block 454, Has a heat riser that is sandwiched between the Manifold and the TBI. The gasket had become brittle and basically just broke apart. After changing that it ran like new truck,thanks for a...	14
	1999 Chevrolet Silverado 1500 5.3L front axle, transfer casenois VIN: T8XZ111047 This truck still has a noise. I did try GM wheel bearings, swaping an quiet transfercase in, front and rear drive shafts, but noise was always there. The tires are all same size,with same amount of tread wear. When I swaped transfecases I did find the trans mo...	15
	2000 Chevrolet S10 2.2L starter VIN: 1GCCS1451Y First of all thanks to everyone who took the time to reply to my request.I got some very helpful replies.I must correct my original diagnosis:I said that I could get the starter to stop cranking when I pulled the crank fuse,that must have been a coincidence wh...	14
	1997 GMC K2500 Sierra SL 5.7L MIL Lamp on VIN: 1TGEK19R4W I recieved some good replies.The problem is that this system on this truck is to clever for the emulators available.I have found a processor from duel curve that will fix the problem.The other way to fix is to use vapour injection kit.I cannot get client to fo... Trouble codes: P0133, P0153, P0171, P0172, P0175.	5
	1998 Pontiac Sunfire SE 2.2L Radio VIN: 1G2JB5245W Well, after leaving ignition on for an hour and getting numder from radio I called my dealer to get the unlock code, who informed me the customer would have to bring it to them. Go figure! Tried to get code from the number Alek gave, (Canadian id #) oops. Cust...	10
	1999 Pontiac Grand Prix GT 3.8L front end VIN: 1G2WP12K4X hi, suggested possible solutions of sway bar bushings and intermediate shaft lube or repair. customer decided to wait at this time and do no repairs. thanks for the help	17
	1994 Saturn SL2 1.9L Excessive Emissions, Surge, Cuts out VIN: 1G8ZK5576R Hi all. Ok, sometimes we get in that mode of the customer is calling every hour and we rush through things. I tested the EGR system BEFORE I replaced the failing crank sensor.In my defence, Michell list three EGR systems, one Positive back pressure, one Negi...	6
	2006 Saturn Ion Red Line 2.0L Super Charger Oil VIN: 1G8AY11PX6 OK. The concensis is to not worry about it. 'sealed and not servicable' . The only reason I check them is because about 15 years ago I had to buy a blower for a 3800 bonneville after being sued in small claims for not checking the supercharger oil level when I...	6

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