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Prev Professional Automotive Repair Technical Discussions for March 23, 2011
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Open Help Requests for GM
Help Request Answers
2004 Buick LeSabre Custom 3.8L No Start VIN: 1234567890
Hello, thanks in advance for reading this. Sorry about the fake VIN, I am no longer at the shop. This is a plain old 2004 Buick with a 3.8. It does not start, it does crank. The vehicle acts like it almost wants to start, sometimes when you release the key aft...
2001 Cadillac Seville SLS 4.6L Misfire VIN: 1G6KS54Y61
engine missfires for 10 to 20 seconds after hot restart. ok on cold starts, and ok after missfiring "spell", until next stop, and next hot restart. Trouble codes: P0300
2004 Cadillac Escalade 6.0L cruise VIN: 1GYEK63N04
Vehicle came in no-brake lights intemitten, cruise control in/op. Replaced brake light switch (oe part) brake lights work good, still have cruise control that will not work. data says stop lamp switch applied, unplug switch same data. have 5 volts on white wir...
1999 Chevrolet Silverado 1500 5.3L Cluster VIN: 2GCEC19T7X
Hello this is a vehicle that i'm trying to diagnose before i leave for vacation tmomorrow. The instrument cluster is totally inop unless the vehicle is in reverse. I noticed the data for under bcm ignition 1 is inactive unless the vehicle is put in reverse. Ne...
2001 Chevrolet Silverado 2500 HD LT 6.6L p0872 VIN: 1GCHK23182
PLEASE!! help me out this truck has P0872 code have checked tsb and replaced PNP also have ran through the testing procedure for this code. one you shift into over drive it shifts from first to second fine and when it gose into thrid it has a hard shifr after ...
2005 Chevrolet Suburban 1500 LS 5.3L Low Oil Pressure VIN: 1GNEC16Z45
Oil pressure at start-up is 30psi, as engine warms oil pressure drops to below 10psi. Oil is ariated, bearings look good, engine doesn't miss, and there is no engine noise until the pressure drops below 10psi. Any help would be greatly appreciated.
2005 Chevrolet Silverado 1500 5.3L Transfer Case VIN: 2GCEK13T05
Hi I have this 05 chevy 4wd that comes out of gear when in 2wd mode. If you press the auto 4wd button or 4wd high button it will drive fine but when in 2wd it will drive a short distance then pop out of gear like the transfer case is in neutral and the only wa...
2005 Chevrolet Corvette 6.0L Harmonic Balancer VIN: 1G1YY34U65
I'm wondering what all is involved with the replacement of the harmonic balancer. This car has the symptoms of TSB#05-06-01-001D. My question is, do you really need to use the special tool to remove the front mono-leaf? And what about removing the harmonic bal...
2005 Chevrolet WORKHORSE 4.8L Poor Idle Quality, Stall, MIL Lamp on VIN: 5B4KP42V55
Well this is a work horse, but just pretend that its a silverado 1500 series pick up. It came in a week ago with throtle body system codes. Testing determined that the #1 tps was not working. So we installed a new throtle body. That took care of half of the co...
2005 Chevrolet Equinox LS 3.4L locks, lights, blower VIN: 2CND123FX5
EVERYTHING points to a bad body control module but it's not setting codes. Both dome lights act like strobe lights when the doors are open and the vehicle's off. Horn randomly sounds off but it's quiet Doors lock and unlock randomly Ditto with the heater...
2005 Chevrolet Silverado 2500 HD LT 6.6L master cylinder VIN: IGCHK23245
Hello techs I had this truck come in with all four wheels locked up. I was able to open bleeders and get the brakes to loosen up. I looked at the fluid coming out and it looked dark, upon adding fluid to the master I noticed some type of oil kind of mixed in a...
2009 Chevrolet Suburban 1500 LT 5.3L Trailer Brake Wiring VIN: 379J116294
According to TSB#07-08-45-001F : The harness, with blunt wire ends, to connect an aftermarket Trailer Brake Controller should be looped and taped to the main harness near the Data Link Connector. There is a very good picture of the location on the TSB. I have ...
1997 GMC C3500 Sierra SLT 6.5L steering gear box VIN: 1GCHC36F6V
This truck has a wobble in the steering when stopping. It is NOT a brake pulsation, there is a difference so please don't suggest brake rotors and calipers. When braking, at around 12-20 mph, the steering wobbles pretty bad. I lifted and supported the front su...
2000 GMC Jimmy SLE 4.3L Hesitation, Cuts out, Stall VIN: 1GKDT13W3Y
Vehicle stumbles, cuts out and will stall on occasion with moderate to heavy accel. If you hold your foot on the gas pedal as it begins to act up the car will backfire and pop, like the timing is WAY off, shudder and bog down and will stall at times. No codes ...
1997 Pontiac Grand Prix SE 3.8L No Start VIN: 1G2WJ52KOV
Vehicle fails to start intermittently. It spins until the ignition is returned to off or run position then restart. Immediately it will run just like normal! Crank sensor and Cam sensor signal look normal when it is running. Fuel pressure is 42 psi at idle. Ha...
1998 Pontiac Trans Sport Montana 3.4L Excessive Emissions, Poor Idle Quality, Stall, Misfire, MIL Lamp on
ok guys, please help!! car came in shop with coolant leak. dye test...head gasket. change head gaskets and start up. sounds like timing belt broke when turning over. found pushrods bent. the short ones??? if it was the long ones i would say installed wrong, bu... Trouble codes: P0300
1999 Pontiac Sunfire SE 2.2L No Start VIN: 1G2JB1242X
Hi fellow IATN Techs, hope some of you can help me out with this Sunfire. This was at another shop & towed in as a no start. They had put a new fuel pump & ign. coil. The car has no 12v power from the computer to the fuel pump relay( pin 8). Also...
2000 Pontiac Grand Prix SE 3.1L Blend Doors VIN: 1G2WJ52J7Y
We have just switched repair info providers to Mitchell and to be honest, we are learning the new system very slowly. Our problem is that this car has very little to no volume to the defrost vents on both sides and l.h. dash vents. The lower register seems OK....
2004 Pontiac Grand Prix GTP 3.8L Cluster/ Info Center VIN: 2G2WR52404
Right after starting, info center display's multiple warning's. ABS, anti-lock,variable rate power steering,service brake system,low fuel/fuelgage erratic. Checked for code's.None at this time.

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick Century Limited 3.1L egr tube VIN: 2G4WY52M9W
Well you guys hit the nail on the head again. Like many of you said, you've seen this before while doing the lower intake gaskets and the egr ports are plugged. This goop look just like oil and water mixed together. With the egr ports plugged it just builds...
1994 Cadillac Seville SLS 4.6L noise VIN: 1G6KS52Y3R
Well this Caddy has a new home. Owner decided against any repairs as the car was running and the clicking noise may or may not be repaired with a new actuator. Sold the car. I was informed that I could not do as relearn on the security by cycling the key switc...
1997 Chevrolet Venture 3.4L No spark VIN: 1GNDX03E5V
Thanks to Mike from British Columbia and his pin voltages and advice there was an overlooked blown fuse to the DLC/cigarette lighter which threw communication. We restored spark and injector pulse through replacing the injection relay. There is still a fuel-pr...
2004 Chevrolet Silverado 2500 HD 8.1L Speedometer VIN: 1GCHK23G14
Thanks for the many replies. This is the first time all replies were completely unanimous - bad speedo. Apparently, the stepper motor that constitutes the speedometer mechanism goes bad - common problem. There is an extended warrantee on these but this vehicle...
2005 Chevrolet Impala 3.4L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 2G1WF52E45
Thanks everyone for your info. most of you where right on suspecting the catalytic converter. after replaceing all damaged parts a back pressure test was done and cat. was replaced to finish the job. all the codes where set by the damaged parts. Trouble codes: P0101 (p0300-), P0300 (p0620-), P0620 (p1106-), P1106 (p1626-), P1626.
1998 GMC Yukon SLT 5.7L Misfire VIN: 1GKEK13R8W
wire were burnt in lume on back left hand side of upper intake thanks bob
1994 Pontiac Bonneville SE 3.8L Entire vehicle vibrates VIN: 1G2HX52L3R
Sorry folks but she hasn't returned for further diagnostics. Everyone pretty much suggested the torue converter, harmonic balancer, or inner CV joints. The Trans was rebuilt 3 years ago and according to AAMCO, when she returned with her new vibration in Octobe...
2007 Pontiac Grand Prix GT 3.8L air bag VIN: 2G2WR55407
Thanks gentlemen, I figured the reprograming may have been the issue. I assumed I would have had a code for configuration or communication error. Thanks again for your time
2006 Saturn Vue 2.2L automatic lights VIN: 5GZCZ33D26
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