GM Automotive Technicians Technical Discussion and Fixes for Jan 31, 2006

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	Help Request	Answers
	1990 Buick Century Custom 3.3L Hesitation, Cuts out, Stall This vehicle has no power under load, and gets worse the harder you push it. Can get problem to occur by revving engine without driving sometimes. Feels like plugged exhaust. When problems happens the more gas you give it the worse it gets or it will stall. Fu...	View
	1990 Cadillac DeVille 4.5L Stall, Misfire VIN: 1G6CD5330L This car came to me from another shop with a poor cold run problem. As it turns out the car misfires so bad it will stall. It only stalls at idle when RPMs are low but it misfires at any throttle position and any load(until it warms up). Feels like secondary i... Trouble codes: 49 (air injection system problem)	View
	1997 Cadillac DeVille d'Elegance 4.6L Oil level VIN: 1G6KE54YXV This is my first Northstar. Engine is burning oil at a rate of 1 quart every 3000 miles. Recently had to add a quart or two of coolant. No visable leaks of oil or coolant. "Block Check" negative for head gasket leak. Did not have a chance to check with gas ana...	View
	1991 Chevrolet C1500 Cheyenne 5.7L Cuts out VIN: 1545464616 Hope you can help complaint of stalling at a stop. Check data only weird thing is showing convertor at lock up checked and someone unplugged the trans could this still create a lockup situation? When stopping it sort of feels like that but i didnt think it wou...	View
	1992 Chevrolet Corvette 5.7L clutch pedal VIN: 1G1YY33PON customer is having problems keeping brake fluid in his clutch hydralic system. We replaced the master with an after market unit and the slave with a dealer unit. Job went well and 6 months later it was low again, In the course of repairs, I have changed both u...	View
	1994 Chevrolet S10 Blazer 4.3L heater core VIN: 1GNT13W292 any one have any tricks for the heater core replacement, I have the official 125 step version, but I have never been lucky enough to do a Blazer. Thanks in advance. Dave	View
	1995 Chevrolet Lumina 3.1L Unknown VIN: 2G1WL52M8S This trans was rebuilt about 2 weeks ago, it had a severe shutter near 80kph almost like bad coil pack and it was repaired by our local CTC, it"s got sent to us because they found a leak, fluid coming from the vent. When the vent is leaking the level is high w...	View
	1996 Chevrolet K1500 Cheyenne 5.0L high idle VIN: 1GCEK19MXT Customer complaint of high idle after warmed up, it does it, after warmed up, acts like it is sticking after you accelerate to above 2000rpm it will stay there untill you load the engine without throttle input then it will idle down to 759-800rpm, and be fine ...	View
	1997 Chevrolet Venture 3.4L power sliding door VIN: 1GNDX06E2V Hello all, I have a power sliding door that will when the button is pressed unlatch but the door wont slide back on its own, I can push it back, it is unlatching ok but the clutch and motor dont opperate, first I tried to reinitialize the system by 1 turn igni...	View
	1997 Chevrolet S10 LS 2.2L Oil pan VIN: 1GCCS1949V I read in Mitchell that to replace the oil pan gasket you need to remove the engine. Is it possible to remove and install the oil pan without engine removal?	View
	1997 Chevrolet C1500 5.7L Misfire, MIL Lamp on VIN: IGCEK19R8V code 306 light come on while watching the scanner missfire count #6 #3 miss at idle, we have good fuel, ignition looks good compression is 120lbs on these two clyinders and 150lbs on the others, hc are 350 at idle and comes down at 2500 rpm Trouble codes: 306 (cyl 6 missfire)	View
	1998 Chevrolet Van G2500 6.5L Fuel Solenoid Driver This van was towed in not running. Determaned the fuel solenoid driver is bad. I am looking for a remote driver module mounting kit. Other garages I talked to said it is available but can not tell me where to get it. It cosist of a mounting bracket and extensi...	View
	1999 Chevrolet Cavalier 2.4L abs pump VIN: 4G1JF32TOX Hey guys I got this cavalier that has a code 1246 rear abs channel will not move.I tried to run a self test on it with the master tech and I can hear the motor run but then it stops.I also noticed on the scan tool that the abs voltage goes down to about 2.5 vo...	View
	2001 Chevrolet Venture LS 3.4L Excessive Emissions, MIL Lamp on VIN: 1GNDX03EX1 Van fails efficiency at idle? Freeze frame data always shows between 600-700rpm. This van originaly had a convertor replaced by another tech about 1 year ago. I got it a couple of weeks ago because of the P0420 DTC. Checked it out and found a dirty MAF and con... Trouble codes: P0420 (TWC efficiency below threshold)	View
	2001 Chevrolet p 30 cutaway 5.7L starter/flywheel VIN: 5B4KP2R413 Hello, I have an account that has 13 of these p 30 utility body vehicles, all of which have the 5.7L (R) code engine's. This truck is an 01, which came behind the wrecker on a Monday 4 weeks ago. The starter sounded terrible so I pulled and had the local elect...	View
	2004 Chevrolet Avalanche 2500 8.1L engine VIN: 3GNGK22614 Has anyone run into a GM 8.1 L in a 2004 Avalanche 2500 useing 2 quarts of oil in 1500 miles ? This is my own truck. The dealer say's this is OK. I don't agree. The exhaust is blue all the time, not just when started up. You can smell the oil burning. The truc...	View
	1999 GMC Yukon Denali 5.7L No Start VIN: 1GKEK13R7X Vehicle came on a hook, no start, good spark, fuel pressure and fuel pulse. back fires when trying to start, like timings out of wack. checked cap rotor and plugs, no crackes. compression on each cylinder around 150. I've seen several of these have problems wi...	View
	2001 GMC C3500HD 8.1L Unknown VIN: 3GDKC34G51 Customer has owned truck since new. Has complained of a soft pedal. Bleeding with a master tech brings the pedal up and firm, but after driving a few miles pedal gets soft and low again. Truck never fails to stop but it feels a little "scary". The dealer offer...	View
	2002 GMC Envoy SLE 4.2L converter lock-up, shift VIN: 1GKDT13S52 Vehicle came in with complaint of poor power, fuel mileage, engine speed all over the place (customer's words). First thing I did, was hook up the scanner, no codes. Took it for a roadtest. Seems like the truck started off in 2nd gear even though the Gear PI...	View
	2004 GMC Sierra 3500 6.0L Lighting VIN: 1GDJC34UX4 Im just getting into this one and thought I would run it by everyone to see anyones had this problem with one of these. First of all it has a tool bed on it . and a trailer brake all have been on since new . what this thing will do is if you have the turn sign...	View
	1995 Oldsmobile Aurora 4.0L starter VIN: 1G3GR62C7S Vehicle was brought died on him in work parking lot. Customer called me and asked if I did starters. sure we do. I get in this car and for kicks I turn the key over because try to keep it simple stupid. Turn the key on dash lights up everything lights up like ...	View
	1997 Oldsmobile Silhouette GL 3.4L Misfire, MIL Lamp on VIN: 1GHDX03E2V Misfire counter shows skipping on #2 & #5. Idle is a little "nervous". Long term adaptive is @ -14%. It acts like it has a vac leak but I can't find one with smoke. Compression on the effected cyl's is good. Has anyone run into this? Trouble codes: P0300 (Random misfire)	View
	1991 Pontiac Bonneville LE 3.8L Excessive Emissions, Poor Idle Quality, Cuts out, Stall, Misfire VIN: 1G2HX54C7M Man oh man,I'm really stumped here and looking for a little insight.Car came in with hot drivability problem.test drove and sure enough after good and warm ran like dog doo.ran a few simple tests and heres what I found...when running bad I pulled plug wires of...	View
	1996 Pontiac Bonneville SE 3.8L Hesitation, Misfire VIN: 1G2HZ52K2T hello guys, this car has a missfire under a heavy load or when acclerating on the highway, it will run good in town 30-45 mph, at idle it is very smooth. I have a tech2 and is just getting acquainted to it and i looked at the misfire at idle , it has a small o... Trouble codes: P0300	View
	1996 Saturn SC2 1.9L speedometer VIN: 1G8ZH1277T first of all, thanks to all for helping. this saturns speedometer is inoperative when vehicle is started cold in the morning. as the car warms-up the speedo starts to work but is inacurate. the longer the vehicle is driven, the speedo becomes normal. this is c...	View
	2002 Saturn Vue 3.0L Everything VIN: 5GZCZ63B72 Vehicle was brought in with electrical problem. Customer told me that after they drive it to the store or something and shut it off, they come back out and try to start it and it does not start, no power to anything. They said they have messed with the fuse bo...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Buick LeSabre Custom 3.8L Cuts out, Stall VIN: 1G4HP52L1S installed new ecm and so far no calls or complaints, still waiting from customer to reply. been a week. thanks for all your replies. i hate installing a component with our knowing for sure it is the culprit. however this one was a good trainer i guess. Trouble codes: P0341 (cam sensor).	19
	1999 Buick Century Custom 3.1L abs lite VIN: 2G4WS52M9X wheel speed sensor repaired concern. vehicle came in again for further testing and problem set and stayed long enough to verify sensor inop. have replaced many in the past but never this intermittant thanks to everyone that replied you all hit it on the mark. ...	6
	2002 Cadillac Eldorado ETC 4.6L Relearn VIN: 1G6ET12972 Thanks to all for the replies. Dennis,Jervis,Vincent & Glen. I replace both sensors Upper, Lower or A, B, same smell. Had 3 codes in car. PO335 Sensor A, PO385 Sensor B, P1372 Both Sensor A & B. No MIL on. Craig [...] did used the 'Brick' it held the paper with th...	10
	2000 Chevrolet Express 3500 5.7L front pads VIN: 1GBHG31R4Y thanks to all , pretty much what i thought ,, very overloaded van, lease company --hard to get $$$ but next trip in will sell calipers and hoses , fleet pads and make sure back rears are working , next step por/ valve -we just did a pad pop the other day	22
	2004 Chevrolet Silverado 2500 HD 6.6L speedometer VIN: 1GCMK23234 thanks for all the replies, as was suggested we replaced the instru. cluster and everything is working good. it would be interesting to take a instru. cluster apart and find what part of the circuts/circut board is failing.	8
	1994 GMC ISUZU W4 235CID Failsafe / limp home VIN: J8DC4B1K8S I ended up replacing The trans with a reman unit. The code 35 was an intermittent open at the ATCU connector due to probing the harness during wire cks. Once the connection was repaired and it was not in failsafe I was able to determan that the ATCU was comman...	1
	1997 GMC Yukon SLE 5.7L Stall, MIL Lamp on VIN: 1GKEK13R9V Guess we'll call this one fixed, We put a reman pcm in it and unplugged all 02 harnesses and let it run for 1.5 days with the hood shut to bake out whatever gas residue we could. Not exactly my choice of repairs but sometimes the wallet dictates the repair. We... Trouble codes: P0117, P0502 (vss low), P1114 (ect low intermittently), P0712 (trans fluid temp low), C0035 (Rear speed sensor open or shorted).	3
	2000 GMC Yukon XL 1500 SLE 5.3L Misfire VIN: 3GKFK16T9Y Customer had to take vehicle. I spoke with him a few days later-he said it was running ok. I've left a couple messages on his cell phone but no answer. I know the vehicle didn't cure itself.?? I did want to try moving the coils & injectors as Darryl & Duane ha... Trouble codes: P0200, P0300.	8
	2004 GMC w5500 6.5L Parking lights VIN: JKXW654X44 It was a relay stuck. I did not get to look at it Cust took it to the dealer the day that it was to come to me	8

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