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Prev Professional Automotive Repair Technical Discussions for January 19, 2007
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
2001 Buick LeSabre Custom 3.8L Gas cap VIN: 1G4HP54K11
Help please! This Buick has the gas cap loose light on. We have made sure the cap is on, and have tested it to make sure it is good. I can not find any procedure to reset light or to diagnose why the light is on. If there was a problem wouldn't it make sense t...
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1996 Chevrolet Lumina 3.1L speedometer VIN: 2G1WL52M7T
need to know where the speedometer module is located in this vehicle. had speedometer untill we racked it up and speedo went out. replace vehicle speed sensor to no avail.
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1997 Chevrolet Blazer 4.3L transfer case VIN: 1GNDT13WXV
Vehicle came with no 4WD operation at all with the typical flashing lights when operation was attempted. I found the 4WD fuse blown and replaced it, cleared the codes and then the mysterious problem began. On the lift, when attempting to shift into 4 high from...
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1998 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL52M6W
This car came in with the MIL and P0420 on steady. I want to know if the cat needs to be replaced or not. I took the following readings with my scanner. @ idle the front O2 toggles from 100mv to 500mv, STFT 0% 128 BL, LTFT -26% 94 BL and the cat temp was 512 d... Trouble codes: P0420 (cat effeciency low bank 1 sensor 2)
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1999 Chevrolet S10 LS 4.3L Starting VIN: 1GCCS19X5X
This vehicle was towed to the shop due to crank, no start condition. As soon as we got it unhooked and tried to start, it started, perfectly. Customer requested we keep vehicle and try to repeat situation. Three days later still starting perfect...until the cu...
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2001 Chevrolet Express 3500 8.1L Pedal VIN: 1GAHG39G31
The car came in for front brakes & rotors. I started the job, but ran into parts problems immediately and had to stop. Today, as I had plans to travel, I left the job to be finished by a helper. He called about 1.5 hrs. ago to tell me he had broken a bleeder o...
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2002 Chevrolet Avalanche 1500 5.3L park indicator VIN: 3GNEK13T72
shift indicator in opp in run light up in crank batt. lite is on alt output shift indicator is inopp in run lights up in crank dissapears when running batt lite always on. read all posts, cleaned all grounds, any help thanks in advance
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2003 Chevrolet Suburban 2500 LT 6.0L fuel sender/ gauge VIN: 3GNGK26U93
Hello all!!! Recieved this truck from another shop asking for assistance. the original complaint was that fuel gauge wont go above 50%. They replaced rear fuel pump module including sender. Truck came to me with codes P1172 Fuel transfer pump flow insuffient a...
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1994 Geo Tracker 1.6L kickdown cable VIN: 2CNBJ18U3R
I cannot figure out how to disassemble the kickdown valve mechanism in the transmission, or how to remove the kickdown cable in the transmission. The cable is free, but something is stuck in the valve which does not allow the cable to return all the way. I...
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1995 GMC Jimmy 4.3L Front Diff VIN: 1GKDT13W75
Hello fellow crystal ball readers. Thanks in advavance for any help you can give on this one. This Jimmy came in on the hook because the customer said "the front end is out". The customer states that he gets a roaring noise in the front end, it seems to shift ...
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2004 GMC Yukon XL 1500 SLE 5.3L oil pressure VIN: 1GKFK16T94
I replaced the oil pressure sending unit but found no difference in the guage reading. I then installed an oil mechanical oil pressure guage and found the pressure at idle to be 42 lbs and at 3500 rpm to go to 80 lbs. I decided the oil pressure valve must be f...
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1999 Oldsmobile Silhouette Premiere 3.4L Hesitation, Cuts out, Misfire VIN: 1GHDX03E3X
when vehicle fisrt came in it had no power under load and code 3x signal. replaced exhaust conveter and crank shaft sensors and test drove. vehicle ran fine for two days. now when engine is cold and vehicle is started and engine rpms up to 1500-3000 vehicle cu... Trouble codes: P;030, P0171
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2000 Oldsmobile Intrigue GX 3.5L temp gauge VIN: 1G3WH52H0Y
This car came in with a noisy water pump I replaced the pump and 2 days latter the owner called and said that now the temp gauge somtimes goes to hot stays there a little while and then drops back to normal. I got the car back and test drove at idle it would b...
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Fixes & Summaries for GM
Fix/Summary Answers
1993 Cadillac DeVille 4.9L electronic climate control VIN: 1G6CD53B9P
The fix was a new bcm. I only received 3 replies but they were all right on the money. Thanks for the help.
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1997 Cadillac Catera 3.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: WO6VR52R8V
Thanks guys for the input on fixing this car.. I found the number 3 cam is wrong and the fix was to find the position where it would work where it needed to be... Gm uses the same cams on all cylinders but only changes the position of the dowel pin. So when yo... Trouble codes: P0300, P0301, P0303, P0305.
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1994 Chevrolet C1500 5.7L Excessive Emissions, Poor Idle Quality VIN: 1GTDC14KXR
I finally got to work again on this old truck.I changed oil & filter because of fuel saturation,and restarted.I put vacuum to the map sensor,installed a vacuum guage and this is where it gets interesting.My vacuum guage reading fluctuates between 10 and 15 rap...
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1999 Chevrolet K3500 5.7L No Start VIN: 1GBJK34R1X
Propane computer was defective. We checked ohms from ICM Ignition Timing Signal to PIN #9 on white/clear ECM connector and found high resistance. Opened up wiring harness at both ends. Found the propane conversion people had to cut the white IGN Timing Signal ... Trouble codes: 1351 (Ignition Coil Control CIrcuit High Voltage).
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2001 Chevrolet Blazer LS 4.3L heater core VIN: 1GNDT13W11
Thank you all for the quick responces, especially Jim [...] who emailed me the GM updated procedure. I removed the center console then lowered the steering column, disconnected the dash and layed it on the front seats. Removed all the case bolts, nuts ans stu...
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1997 Oldsmobile Aurora 4.0L Misfire, MIL Lamp on VIN: 1G3GR62C5V
Well guys thanks for the help, this one is fixed, and not fixed. The customer thinks its fixed, but I know better. Sometimes more info from the customer is what is needed, and when I fished a little more with her she told me that it was a new engine that had b... Trouble codes: P0300 (multiple cylinder misfire).
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1996 Pontiac Grand Am SE 2.4L MIL Lamp on VIN: 1G2NE52T5T
Thanks to all that replied. I'm calling this a fix because the lean code went away when I replaced the O2 sensor. It was indeed switching much too slowly. There is no easy access for checking fuel pressure on this car. My friend is still in trouble with the ca... Trouble codes: P0171 (System lean bank one).
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