GM Automotive Technicians Technical Discussion and Fixes for Jan 16, 2012 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1991 Buick Regal Custom 3.8L Battery draw VIN: 2G4WB54L7M Hello, We have this oldie but a goodie Buick that will go stone dead in a day or so. I tested this vehicle for a parasitic draw with the doors, trunk, etc. closed and most of the time it will be about 3.34 amps!! I noticed that when the doors are closed, the d...	View
	1996 Buick Riviera 3.8L air shocks VIN: 1G4GD22K8T customer stated that he noticed car got stiff all of a sudden also. probably about 20-30 degrees F. that day. iwould not think that a pump could do that or there would at least be some sort of relief valve.	View
	2004 Buick Rainier CXL 5.3L Master Cylinder VIN: 5GAET13P74 -- Vehicle first came to shop brake fluid sinking to the floor. Replace Master cylinder with reman unit. Bleed system, Pedal was lousy. Ran several ABS bleeds, then manual bleeds, then flush using power unit. Finally got somewhat of a pedal, still not right. ...	View
	1997 Chevrolet Blazer 4.3L 4x4 VIN: 1GNCT18W5V Customer states when driving in 2 wheel drive,4x4 would engage at times(he noticed when turning,binding action).Customer would hit 4 high switch and back to 2 wheel drive and all ok.Has anyone had this or some possible hints.This happens intermitanty.Your resp...	View
	1999 Chevrolet Silverado 1500 5.3L driveability VIN: 2GCEK19TXX Hello everyone, I have this 99 K-1500 with a 5.3L that I replaced the crank sensor. I can not read codes or data in the run position, but I could in the accesory position, thich is between run and off. If I go to different modules I can communicate with them i...	View
	2005 Chevrolet Silverado 1500 5.3L No Start VIN: 1GCEK19T35 This truck runs very rich the lt fuel trim is about -17 on both banks but when it is cold the truck will not start sprayed intake for vacuum leaks none found, pickup does not have a fuel pressure regulator to leak fuel pressure is at 62 psi, ran vehicle with m... Trouble codes: P0171 (p0172-), P0172	View
	2007 Chevrolet C4500 Kodiak C4C042 6.6L Engine oil/ DPF VIN: 1GDE4V19X7 Need some help on this one. I have a local bus company that has a fleet of the c4500 chevy busses. They all have the duramax lbz engines. I have three of the busses that are "making oil".On are first bus we have change all the injectors, fuel pump and regulato...	View
	1997 GMC Yukon SL 5.7L Cuts out VIN: 3GKEK18R2V Stumper here. Long term fuel trims in high 30's, bogs at wot. Back off and it runs good. Does not miss, starts well. O2's are driven lean under bog conditions indicating fuel delivery problem. Had virtually same truck in Saturday and all readings except fuel t...	View
	2002 GMC Yukon XL 2500 SLT 8.1L Cuts out VIN: 3GKGK26G02 This is a 8.1 liter yukon. The problem the customer is having, and us, is the rear gas tank (8 gallons) does not switch to the front tank (26 or so gallons) when it is low on fuel. GM says that the switch over should happen at 40.2 ohms. We tested his old one ...	View
	2004 GMC Yukon XL 1500 Denali 6.0L Hvac VIN: 1GKFK66U64 Customer states the HVAC blower will not work or respond to speed changes when the vehicle is COLD. Once the vehicle is warm the fan seems to work normally 90% of the time. Sometimes it will continue to run after the vehicle is turned off though. It will not s...	View
	2002 Pontiac Grand Am SE1 2.2L Hesitation VIN: 1G2NF52F02 On cold starts the car will usually start first time. Then when pressing the accelerator the engine will not rev it will either stall or chug then continue idling at WOT. All sensors seem to be reading properly. I replaced the map with a known good one with no...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1991 Cadillac DeVille 4.9L will foul plugs VIN: 1G6CD53B0M Thanks for all the help. On this modle. i cleaned and ohmed the ground by the starter. In the end I had to remove the stud, and run a tap into the block. this cleaned the ground good enough to cure the problem. although I had ohmed this ground, and ran a jumpe...	24
	1969 Chevrolet Nova 5.7L Engine VIN: 1327WER456 Thank you all for the replies... Ok here we go. Get ready to call me dumba$$... After a couple weeks sitting on my rack I finally had to move it this morning. I figured I would drain the oil before starting and put some fresh in it. I expected to get anti free...	53
	1994 Chevrolet K1500 5.7L Unknown VIN: 2GCEK19K9R Thanks for so many people helping! I had done additional things that people had suggested: new brake rotors, balancing drums, checked motor mounts, tune-up, reposition torque converter, test with engine off, and more. (No change) Since I had .027 runout at ...	37
	1998 Chevrolet Tracker 1.6L Misfire VIN: 2CNBJ1867W I appreciate all the replies on this vehicle. Unfortunately it is not fixed at this time. In total this is what I checked and tried: Timing belt inspection and timing marks, all good. Pulled valve cover to inpect cams and rockers, all good. Checked compressi...	26
	2006 Chevrolet Impala LT 3.5L starter VIN: 2G1WT55K06 Well, I could not replicate the problem while the car was in the shop. I checked and cleaned the battery cables/terminals, battery was only two years old and a high quality unit. Cleaned the throttle body/plate, the POS cable at the starter was a slight bit ...	10
	2007 Chevrolet Equinox LS 3.4L MIL Lamp on VIN: 2CNDL13F97 THROTTLE BODY AND RESET MIN IDLE TOOK CARE OF IT, tHANKS! Trouble codes: P0121 (Tp sensor or app sensor 1 problem), P2135 (Tp sensor 1-2 correlation).	6
	2007 Chevrolet Trailblazer LT 4.2L abs module VIN: 1GNDT13S37 Well after fighting with gm to try new ebcm in diag of new one replaced going bad found used ebcm reprogrammed all ok no lights and communication ok send new ebcm back got final word today it was bad out of box. Live and learn.	5
	1997 Pontiac Bonneville SE 3.8L No Start, Stall VIN: 1G2HX52K6V Sorry to post summary so late. I wanted to give this car several weeks to see if it would act up again. Went approx two weeks, all was fine, then no crank. I have not looked at it again, they have no funds. With car running, I wiggled every underhood harness, ...	19

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