GM Automotive Technicians Technical Discussion and Fixes for Dec 30, 2009 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1990 Buick Skylark Custom 2.5L Battery voltage VIN: 1G4NV54U7L This little Buick is a clean old car. Taken care of properly. But it will drain the battery after sitting 5 or more days. After extensive circuit removal from system, I found that the battery drain will only go away with both the battery supply to the ECM and ...	View
	2002 Buick Century Limited 3.1L Hesitation, Surge, Stall, Misfire, MIL Lamp on VIN: 2G4WS52J12 Hello Gm Techs: I have this 2002 Buick century 3100 engine with MIL on, DTC P0300 random missfire. The idle is OK but will not accelerate with load or rev up on idle. I have replaced the intake gasket, had coolant mixing with oil, but still have the issue. The... Trouble codes: P0300 (Random missfire)	View
	1981 Cadillac DeVille 4.1L Distributor VIN: 1G6A04747B The problem with the Caddy is the picture I have for the firing order and timing marks is not close to where it is in the car. I did a head job on this Caddy and I did remove the cap without checking/marking #1. I know not very smart. I did NOT remove or even ...	View
	1996 Cadillac DeVille 4.6L ipc VIN: 1G6KD52Y1T I have more or less narrowed the problem down to the IPC on this Caddy, and would like some other opinions before I send it out for repairs. The problem is that intermitantly the dash on this car will go blank, along with the heater, information controls, radi...	View
	1989 Chevrolet C1500 Silverado 5.0L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1GCDC14H8K Truck was towed in 2 days ago & would not run. Start, surge, & die. Customer wanted me to diag. and R&R broken exhaust manifold bolt. He said someone told him the left injector was not spraying. Checked injector spray. I pulled the TB; cleaned and reinstalled...	View
	1999 Chevrolet Lumina 3.1L Misfire, MIL Lamp on VIN: 2G1WL52M8X Car Brought In From Another Shop. They Have Replaced Coil Wires And Plugs, We Swaped Injectors And Miss Stays At Cyl 2 And 5. Miss Happens Above 2000 RPM. No Miss At Idle. Fuel Pressure 38LBS Running. Whe Miss Happens Rpm 2500, Maf 17.39, Enging Load 11%, Inje... Trouble codes: P0300	View
	1999 Chevrolet Silverado 1500 LT 5.3L Four Wheel Drive VIN: 2GCEK19TXX Vehicle was brought in due to 4 wheel drive not engaging in 4hi or 4lo. Works in auto 4 wheel drive only. Followed the flow chart provided by mitchell for the 4 wheel drive, brought to the module. Replaced the module, no change. Replaced the switch on the dash...	View
	2000 Chevrolet Prizm 1.8L MIL Lamp on VIN: 1Y1SK5280Y Customer has had this recurring P0171 code for the past 1 year or so. Upstream and downstream O2 sensors have been replaced as well as spark plugs. Came to me and I performed smoke test to see if vacuum leak was the cause - no leak noted. As you drive the car ... Trouble codes: P0171 (system too lean bank 1)	View
	2002 Chevrolet Trailblazer EXT LT 4.2L Heated Seats VIN: 1GNDT13S32 Cust replaced drivers door module with used unit from junkyard because all windows were inop from drivers door. Windows work but drivers heated seat does not. Question is all switches and connectors are there but no activity in data list when switch pressed, i...	View
	2003 Chevrolet Trailblazer LT 4.2L MIL Lamp on VIN: 1GNDT13573 This vehicle has had coolant temp codes in each of the last three years. About every 20k the light comes on. We have flushed the cooling system during that period and replaced the thermostat on two occassions already. There are hits for a problem in the coolan... Trouble codes: P0128	View
	2003 Chevrolet Impala LS 3.8L Starting VIN: 2G1WH52K43 Car will not start on first try much of the time, mostly when it is cold. This car has a system where the key initiates the process and it should turn over until it starts. It often stalls (doesn't start) after turning a few seconds the first time but always d...	View
	2006 Chevrolet Equinox LS 3.4L charging system VIN: 2CNDL13F56 Hello! Any help you can give us with this nightmare will be greatly appreciated. Customer complained that her 2006 Chev. Equinox LS would have a dead battery after letting it sit overnight. We had the vehicle towed in and charged the battery fully and tested b...	View
	2001 Pontiac Grand Prix GTP 3.8L abs VIN: 1G2WR52141 this car came in for an abs/tcs light on hooked up scanner and pulled codes c0040: right front wheel speed sensor circuit performance and c0450 power steering control circuit. drove vehicle and all wheel speed sensors are within 1-2 mph of eachother. before hu...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1978 Cadillac Eldorado Biarritz 7.0L wheel bearing VIN: 6L47S8Q275 Well, the consensus seems to be tighten the nut to 110ft lbs and forget about it! I know there is a spacer between the two bearings, but to me the spacer seems to locate the races, not the tapered roller bearings. So, that's why it seems to me the torque is cr...	15
	2000 Chevrolet K2500 5.7L cracked flywheel VIN: 1GCK24U1YE well thanks every one for your help,i just did what you and gm said,knocked the spacer out.when it arrived it came with longer bolts and a nice beefy spacer and i was thinking the spacer distributed the load to stop it from cracking,but after reading replies i...	9
	2002 Chevrolet Avalanche 1500 5.3L MIL Lamp on VIN: T12G361366 called dealership 3 times and the last time talked to someone that knew what was going on. they have wrong part listed for my repair have the right part coming today. thanks for the help Trouble codes: P0446.	5
	2003 Chevrolet Silverado 1500 HD LS 6.0L Stall VIN: 1GCGC13U63 TPS wasbad $240.00 Found that the TPS was intermitantly failing and was not operating in range when vehicle was having the difficuties.	4
	2004 Chevrolet Suburban 1500 LT 5.3L Door locks, Insterment lights VIN: 1GNEC16Z74 First let me thank all who responded to my call for help. Then pat William of Florida. And Glen of ILL. As they called right on the head. While all grounds were connected to the engine the small wire that goes to the passenger rear side of block was not attach...	8
	1993 Geo Prizm LSi 1.6L No Start VIN: 1Y1SK5368P THANKS TO ALL THAT REPLIED THE MODULE WAS THE PROBLEM BUT THE CUST. DID NOT WANT TO SINK ANYMORE MONEY IN A CAR THAT HAS 200,000 MILES. THANK YOU AGAIN. LAWRENCE	12
	2000 Oldsmobile Intrigue GLS 3.5L crank sensor VIN: 1G3WX5ZH8Y Thank you to all of you for your help! Unfortunatly this customers pocketbook will not let us continue. We did swap out the non factory ckp sensor with a delco but still had the problem. Never could get a hick-up or a code while wiggling, shaking or manhandli...	12
	2003 Oldsmobile Bravada 4.2L heater VIN: 1GHDT13S73 Thank you for the replies, as I suspected the actuator fixed the problem. The pinpoint tests in this case could be misleading as they do not give a postion voltage that will cause the fault. All replies stated the actuator as common.	4

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