GM Automotive Technicians Technical Discussion and Fixes for Mar 8, 2011 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1998 Buick Century Limited 3.1L egr tube VIN: 2G4WY52M9W Car comes in with a coolant leak complaint: lower intakes. I pull into shop and have codes P0401, P0300, and P0125. Under code history customer I see where customer has been driving this car for 6,120 miles since P0300 first set. I test drove with scanner and ...	View
	1993 Chevrolet Lumina Euro 3.1L Cuts out, Stall, Misfire VIN: 2G1WP14X0M Thanks in advance. Had to blow the dust off the Tech 1 for this one. This car missfires off idle to about 4000rpm cold and will stall when you put in gear until car car reaches operating temp of about 180. Plugs are not the best but dont think they could cause...	View
	1997 Chevrolet Tahoe 5.7L Steering VIN: 1GNEK13R0V First thanks for any help you guys can give me. I have a 97 Tahoe that when you first start up and take off makes a noise and vibration that comes through the steering column like the pump stalls. This goes away after a few turns and won't do it again until yo...	View
	1998 Chevrolet C3500 Silverado 7.4L interior lights VIN: 1GCGC33J9W Thank's for looking. The truck's interior lights come on at random which drains the battery. I'm looking for the keyless entry modual and the interior light modual. I have found a little plastic black box above the gas pedal but it has 6 wires white, tan, oran...	View
	2000 Chevrolet Suburban 1500 LS 5.3L No Communication VIN: 3GNEC16T4Y Have a 2000 Suburban that came in for a Texas State Emissions Inspection last week. The state computer would not communicate with the PCM. Our Inspector checked all the fuses and none were blown/popped. Customer brought the vehicle back a couple days later to ...	View
	2001 Chevrolet Silverado 2500 HD 8.1L Misfire VIN: 1GCHK29GZ1 I have a problem with hard acceleration or under a heavy load the engine when it is reaching 4000 rpms will start to pop back in the intake very rapidly. It will cause a misfire code but does not pick only 1 cylinder out as a problem. It runs perfect until it ...	View
	2004 Chevrolet Express 1500 5.3L Cuts out, Stall VIN: 1GNFH15T54 I have excessive moisture in the throttle body and upper intake. Clean out and the excessive moisture returns in less than a week and less than 200 miles. Seems to run good other than intermittant stalling which may be from the excessive moisture. It is clear ...	View
	2005 Chevrolet Silverado 3500 6.6L Starting VIN: 1GBJC34235 Truck towed in from regular customer - no start, we have a lot of experience with ford diesels, not so much with gm. Found a blown edu fuse, 25 amp under hood box - anyone seen this before? blows violently as soon as you replace it like a dead short. Just wond...	View
	2007 Chevrolet Impala LT 3.9L Poor Idle Quality, Misfire VIN: 2G1WC58R17 came in with cel. code p0300. customer stated no work has ever been done. I suggested a maintenance tuneup. plugs and wires. after that it still has a misfire. no 4 is the most. a few others have just a couple misfire hits, but no.4 is in the 25000 range. curr... Trouble codes: P0300	View
	1997 Oldsmobile LSS 3.8L No Start, Poor Idle Quality, Stall, Poor Fuel Economy VIN: 1G3HY52K4V Engine is fuel hydro-locking. cts,map,normal-all injectors are being pulsed,noid looks normal. If we remove plugs & blow out cyls.,we can get eng. to run briefly. Inj. puls width is 7-8 mlsec at idle. Fuel psi is low ,as could be expected,5 to 10 at first, 45 ... Trouble codes: P0300	View
	2003 Other GM H2 6.0L Transfer Case VIN: 5GRGN23V93 2003 hummer h2- iam replacing the transmission in this vehicle due to burnt fluid no 3 or 4 gear. When i was removing the rear drive shaft i could not pull it out from transfer case by hand it was necessary to use a air hammer to slide it out?? I found drive s...	View
	2000 Pontiac Firebird Formula 5.7L Mechanical VIN: 2G2FV22G6Y Vehicle has a squealing (rhythmical chirping noise same as rpm of engine) noise after warm up. Louder in bell housing area. When engine is cold noise is not there. Have replaced clutch assembly. Possible something in engine or transmission causing noise . With...	View
	2002 Pontiac Grand Prix GTP 3.8L Misfire, MIL Lamp on VIN: 1G2WR12192 Hello all, thanks in advance for the advice. Car came in missing out on cyclinder #5 at idle. Once you give it some gas the miss goes away. I have swapped coils, wires, plugs, injectors and the miss always stays with #5. I am thinking maybe an internal vacuum ... Trouble codes: P0128, P0300	View
	2003 Saturn L200 2.2L noise VIN: 1G8JU54F83 I've got an exhaust noise, mostly only at 1st start. Goes away after about 4-5 minutes. Raise car up and its very load in the mid section of the exhaust pipe. My fear is the convertor and the resonator are pretty close and I want to replace the right part. Goi...	View
	2007 Saturn Vue 2.2L Hesitation, Stall VIN: 5GZCZ33D17 Compaint on this Vue was at times step on throttle and nothing happens, other times it would accelerate on its own while driving. Other times the speedometer and tachometer would go all over the place, she could be driving and the tach might show 1 or 6 K and ... Trouble codes: P1574 (Brake Switch problem), P3905 (undocumented), P2039 (undocumented)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2002 Buick LeSabre Custom 3.8L Cuts out, Stall VIN: 1G4HP54K22 I would like to thank everyone who took time to offer advice. The car is unfortunatley not repaired yet, but it is a freinds car and it will be back for another go-around if and when problem gets worse. Heres the deal with this thing, it only acts up when car ...	36
	1995 Chevrolet Corsica 2.2L No Communication VIN: 1G1LD5540S This vehicle was a royal pain, made worse by a customer who knows just enough about what he is doing to have screwed something up. In this case, the customer had moved the UART data line, (circuit 800, tan wire) from terminal M of the ALDL connector to termin...	8
	2004 Chevrolet Malibu 2.2L Battery VIN: 2G1WF52E14 Sorry to say while I was on vacation the customer traded the car in on another vehicle so I'll never know now. Thanks for all the suggestions & help Mitch [...]	19
	1992 Geo Prizm 1.6L smokes VIN: 1HG4654977 So. Most thought it was the piston rings. However it was oil puddling excessively near the PCV pick up tubes on the valve cover. A simple fix was to stuff and secure Two PCV breather filters into both PCV pick up tubes. The car was driven again w/oil at the F...	7
	2003 GMC Yukon XL 1500 Denali 6.0L shocks VIN: 1GKFK66UX3 looks like going to use arnott shocks, waiting for customers final choice thanks for the help	5
	1999 Saturn SL2 1.9L No Start, MIL Lamp on, reprogramming VIN: 1G8ZK5272X Flashed the vehicle with a tech 2. After disconnecting p.c.m., it reset allowing us to program as normal with a tech 2 and the red adapter. Apparently the Mastertech does all other GM vehicles except Saturn, so now i know. Vehicle was reprogrammed due to a ... Trouble codes: P0133 (O2 sensor slow response bank 1 sensor 1).	6

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