GM Automotive Technicians Technical Discussion and Fixes for Jun 13, 2006 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1995 Buick Century Custom 3.1L Cooling fans VIN: 1G4AH55M8S This Century is blowing the fuse for the cooling fan relay control circuit, the one the ecm grounds to turn on the fans. It is a 10 amp fuse located behind the fuse block in the glove box. I saw a few posts about the fuse location, but I could not find any thi...	View
	1997 Buick Skylark Limited 2.4L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1G4NJ52T3V Okay. I need help. This car was brought in on the hook. Customer stated that he had ben on open highway for about 10 minutes, slowed down to 45mph to pass through a neihboring town and when he went to accelerate back up to speed the car started to shake violen... Trouble codes: P0300 (multiple misfire detected)	View
	2002 Buick Century Custom 3.1L Hesitation, Surge VIN: 2G4WS52J02 HI THIS IS MY BROTHERS CAR, IT SEEMS SLUGISH ON ACCELERATION UNTIL YOU GET TO 75% THROTTLE AND THEN IT FEELS LIKE THE [...] OPEN (I KNOW IT DOESN'T HAVE A 4BARREL BUT THAT IS WHAT IT FEELS LIKE) I HAVE FOUND THAT UNPLUGGING THE EGR VALVE SOLVES THE PROBLEM....	View
	1993 Cadillac Seville STS 4.6L MIL Lamp on VIN: 1G6KY5292P Hi Techs, we put a used engine in this car and it started pumping coolant so we installed another used engine. The only problem is the service engine soon light is on,(code 083) for 24x signal is high. The engine will not start (no spark) when both sensors are... Trouble codes: 083	View
	1993 Chevrolet Corvette 40th Anniversary Edition 5.7L No Start VIN: 1G1YY23P8P The vehicle came in as a no start. I replaced the distributer, re assembled and it was still a no start. Only now the Coil gets blistering hot and the tach filter is smoking. Checked a few wires at the coil and found the the tach filter wire is grounded. I cut... Trouble codes: 42 (IC Grounded)	View
	1995 Chevrolet K1500 Suburban 5.7L Differential VIN: 1GNFK16K1S I feel dumb with this one but the late nights are catching up with me.this suburban has a inop 4x4 .someone else already put new style frt. actuator (fully electric).have power at brown wire tapped into transfer case no power at either wire going to actuator d...	View
	1996 Chevrolet Blazer 4.3L Misfire VIN: 1GNDT13W3T hi fellow tech's. ty in advance for your help i have the infamous 4.3 s-10 with the ever so popular po300. tech 2 show cam offset -17. removed dist gear was worn no shaft play and cmp sensor looked ok and seemed to test ok.replaced gear popped it back in still... Trouble codes: P0300	View
	1999 Chevrolet C2500 Suburban 5.7L Power door locks VIN: 1GNGC26R6X This is our backup Battalion Chief vehicle, it has lights, siren, and on scene response camera. It has cargo doors in the rear and is NOT equipped with keyless entry. The operator complained of the door locks inoperative. I checked them and they operate fine f...	View
	2000 Chevrolet Tracker 2.0L Poor Idle Quality, loss of power VIN: 2CNBJ13C2Y Need help with timing set procedure. This vehicle has had a cylinder head removed and rebuilt due to a defective spark plug electrode getting caught in #1 exhaust valve and seat. Re-installation went well. The timing components, chain, gear, cam sensor, etc. w...	View
	2002 Chevrolet Impala 3.4L Electric door locks VIN: 2G1WF55E12 the vehicle & door locks have worked correctly from 5-11-06 until now. Door locks again won't work and 20 amp fuse blown in fuse box on driver's side panel. this time the vehicle also wouldn't crank until battery charged for 2 hours at 20 amps. Vehicle then st...	View
	2003 Chevrolet Silverado 1500 4.8L missfire VIN: 2GCEK19VO3 This truck towed in today,runs but has missfire codes on cyls 2,4,6,8, only.Scan showed only missfires,no other codes.Fuel pressure is ok,talked to a friend at dealership,he told me to check for shorted o2,but i found none.This is the first newer vortec i've h...	View
	2004 Chevrolet Express 3500 6.0L oil loss VIN: 1GBHG31U04 Carbon canister is filling up with engine oil. Engine has 1/2 qt left in the crankcase. Vaccum is at 15-17 inches. No excessive pressure in crankcase. Has anyone run into this at all. Lot's of miles on the engine. But it does not make any sense. GM is checking...	View
	1997 Oldsmobile Cutlass Supreme SL 3.1L abs VIN: 1G3WH52M3V hello to everyone this is the first time i am writing to the help line. this car has me puzzled to say the least. the car came originally with history code 1226 (right front excessive wheel speed sensor variation). from the very first time i had a problem dupl...	View
	1992 Pontiac Sunbird LE Value Leader 2.0L Unknown VIN: 3G2JC11H3N Need iATN help, When applying brakes only while driving this car makes a hissing noise (possible vacuum leak although not found) from the center to passenger side air vents. The symptom will not occur if I pump the brake pedal while stopped, nor will it make t...	View
	1999 Pontiac Grand Am SE 3.4L Left front speed signal Hey all, This is my own car and as you all know, us techs dont get alot of time to work on our own stuff. So here it goes about a year ago my better half was driving in some rain and the abs light came on. Well i was gone for annual training in the national gu...	View
	2003 Pontiac Aztek 3.4L noise from brakes VIN: 3G7DA03E43 we had this vechile in originally and turned the drums as they apeared to be threaded. the noise went away for approx two months then returned. we brought it in agian and serviced the rear brakes and backing plates with lube noise went awayt again for two mont...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1994 Buick LeSabre Custom 3.8L tcc accumulator VIN: 1G4HP52L6R FIX: No TCC accumulator used on non 3.4L engines. Leave an empty hole without a piston and move on. The transmission works like a charm, Thanks guys! In the back of my mind, I thought I had taken a piston out of the hole on teardown. While the parts layout s...	5
	1997 Buick Park Avenue 3.8L air mix door VIN: 1G4CW52K1V Hi people, and thanks for the many replies...it was in fact low on freon..recovered freon,weighed it.evacuated and recharged with dye,works fine now..kind of goes against all logic,but the car is fixed,except for the leak i will check it tommorrow,to see if i ...	11
	2001 Buick LeSabre Limited 3.8L vibration VIN: 1G4HR54K21 thanks to all! the fix was the left inboard (tripod joint) was galled, replace w/ reman axle. road test. vibration is gone.iatn is great	23
	1967 Chevrolet Corvette 327CID hubs VIN: 194677S111 There were many replies, and some duplicated feedback. The main gist of the replies concerned whether the rear hub play was too great (.001 to .008 being the spec.), and I concluded that end play wasn't the problem. All other external parts were new, i.e. the ...	27
	1988 Chevrolet S10 2.5L MIL Lamp on VIN: 1GBBS10E3J Thanks for all the suggestions. We had checked all grounds and unplugged ECM. We disconnected every sensor to check for shorts. We grounded circuit 461 as was suggested. We tried another ECM. All testing said the ECM was bad. We had another Postal vehicle come...	8
	1999 Chevrolet Blazer 4.3L Hesitation VIN: 1GNDT13W0X Thank you all for responding to my problem I neede to go back to basics I checked intake vacuum gauge was waivering badly Had a bad valve spring Replaced engine with reman and problem was cured Sorry for the bad info I needed to do a more thorough check Thanks...	10
	2002 Chevrolet 6500 210CID Poor Idle Quality VIN: 1GBJ6H1C72 Thanks to all that replied.I got six replies in all. Some said bad injector, some said I needed to have a certain type scanner to read the codes( we didn't have it of coarse), and one said a high pressure oil line might be the problem. we ran the truck a whi...	6
	2003 Chevrolet Tahoe LT 5.3L Driveabilty VIN: 1GNEK13Z43 Thanks for the great replies. Didn't get a chance to try any. Had scoped the sensors and new they were good. Proublem was rodent induced. Wires chewed on top of tranny. Thanks again	10
	2004 Chevrolet Trailblazer LS 4.2L Hesitation, Surge VIN: 1GNDT13SX4 Thanks to Raymond for you info on the 2 TPS voltages, it was a big help. Dan, there is No MAF sensor used on this application. It turned out that during another test drive we got the MIL on and code P0171 system lean set. After verifying no fuel problems,n...	3
	1997 Geo Metro 1.0L No Start VIN: 2C1MR2266V Yes the vehicle is fixed. Figured it had to be something odd. So I started at the begining again. Rechecked circuits. Found that the ground to the ignition control module would light my test light with the light connected to battery power. I assumed on previou...	3
	2004 GMC Yukon XL 1500 SLT 5.3L battery Drain VIN: 3GKEC16Z64 you can call this one finshed. setting inside truck you coild not here it running but rear a/c blower was stuck on low speed customer had all rear vents closed. found rear blower resistor to be the problem gm has a tsb on this problem.went home for the weekend...	9
	1999 Oldsmobile Alero GLS 3.4L Suspension VIN: 1G3NF12E9X As suggested, I replaced the part's store wheel bearings with ones from a dealership, and the 'Clunk' went away.	15
	1994 Saturn SL1 1.9L troubled codes VIN: 1G8ZH5593R Thanks to all. Well guys its my car, and if it acts up again (it still has a delayed reverse when hot and needs a valve body) then Ill fix it and thanks to all of you cause I know what to do now. Thanks again God Bless Eric	8
	2003 Saturn L200 2.2L no accel after 55mph VIN: 1G8JU54F63 Sorry for the delay in closing this help request, wanted to be sure it was fixed. The customer thought thay may still have a problem but have come to the conclusion that it is fixed. The fix was replacement of the cat. It was restricted as most thought. Thanks... Trouble codes: P0172, P0730.	10

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