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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for December 30, 2009
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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 ...
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)
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 ...
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...
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...
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
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...
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)
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...
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
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...
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...
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...

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...
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...
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.
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.
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...
1993 Geo Prizm LSi 1.6L No Start VIN: 1Y1SK5368P
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...
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.
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