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Prev Professional Automotive Repair Technical Discussions for August 14, 2006
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Open Help Requests for GM
Help Request Answers
1986 Buick Riviera T-Type 3.8L engine VIN: 1G4EZ57BOG
oil light came on. vehicle isnt knocking yet but did have valve train niose. removed sending unit to test pressure with mech guage. 0 psi present. remove gauge and sending unit and crank engine with disabled ig system. oil wouldnt even come out the open hole o...
1991 Cadillac DeVille 4.9L No Start, Hesitation, Stall, MIL Lamp on VIN: 1G6CD53B1M
Hi Cadillac Tecs, This car came in running good, check engine light on. Scan computer, code 048, and code 053. Cleared codes and drove car on 3 mile trips, no problem, no check engine light returned. After car set for about 20 minutes went to restart and would... Trouble codes: 048 (egr problem), 053 (dist. signal interrupted)
1988 Chevrolet C3500 Cheyenne 7.4L prom VIN: 1GBCHR34N4
The Owner Has Put A Used ECM From an truck that had 5.7 and also switch the big prom so that it stayed with the right motor. My Question is that there is also an small chip that is beside the prom that the owner did not change over. Would that small chip be an...
1988 Chevrolet R10 Suburban Scottsdale 6.2L unsure VIN: 1GKER16C8J
Need some help on this A/C. This particular truck came in with the a/c not cooling. We charged the system and added dye. The a/c didn't blow cold after charging the system. We then found a leak at the a/c compressor (HR6 model). We installed a new compressor, ...
1995 Chevrolet C1500 5.0L oil & temp Gauge VIN: 2GBEC19H3S
Customer has been complaining for 6 months that after cranking in the morning and driving for 10 to 15 minutes that the temp and oil gauge goes all the way right, check gauges light comes on and after about 10 seconds it goes back to normal. I have check temp ...
1997 Chevrolet K1500 Suburban LS 5.7L rear hoses VIN: 1GNFK16R8V
While this may appear to be a stupid question, bear with me. Has anyone out there found any kind of a procedure for removing the rear a/c lines from the evaporator? I'm sure we have all tried various things with little or any success. Every rear a/c equipped v...
2001 Chevrolet Tahoe 5.3L MIL Lamp on VIN: 1GNEK13T31
If nothing else I would like verification to give to the customer. The light and code are set appro. every 200 to 280 miles or so. I went through the diag. of this code and found everything is within spec. I did find a TSB ( 04-06-04-055 ) regarding vehicles i... Trouble codes: P0446
2004 Chevrolet Silverado 1500 5.3L speedometer VIN: 2GCEC19T94
I found the speedo reads 30pmh when stopped, then stays about 30mph over the speed while driving. MIL was on because of evap code; gas cap was loose. I test drove the truck with the scanner plugged in and the mph reading was proper, and the odometer works norm...
1998 GMC K1500 Sierra SL 5.0L Harsh surging shifts VIN: 1GTEK19M1W
The customer complains of a weird transmission shifting concern. He said he felt this problem and that he replaced the trans with a used transmission and that the problem is still the same. So I drove it and it really has a different shift. Sometimes all the g...
1995 Oldsmobile 98 Regency Elite 3.8L No Start VIN: 1G3CX52K2S
Hi eveyone, I have spark, fuel and injector pulse. Still no start, does fire in exhaust like retarded timing. Removed O2 to check for plugged exhaust. No help. Disconnected cam sensor, no help. Cam, crank and crank sync look OK to me. Tried known good moduel ...
1995 Oldsmobile Cutlass Ciera 3.1L Misfire VIN: 1G3AJ55M95
original diagnosis, found cyl 1 injector was working electrically but was plugged with white ashy substance, in fact the end of the fuel rail where cyl 1 injector sits was packed with this same substance. the location of cyl 1 injector is at the end of the rai...
1996 Oldsmobile LSS 3.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 1G3HY52K6T
when hot outside 90 degrees or so and engine temp guage goes to 200 degrees the engine stalls and check engine light flashes. it restarts after a little while and runs okay until the engine get real warm again. only one code - po300 - random cyl misfire. we ca...
2003 Oldsmobile Bravada 4.2L abs module VIN: 1GHDT13SX3
hello fellow iatn members i have a 2003 olds bravada with a abs light on and codes co281=stop lamp switch circuit co268=pump motor circuit shorted and c0267=pump motor circuit open my question to you have you come across this before and what should i be lookin...
1998 Pontiac Grand Prix SE 3.1L injector pulse VIN: IG2WJ52M5W
i have this grand prix with a no start sometimes. customer has replaced crank sensor twice and now i get it. when no start happens it has spark but no injector pulse. this model has no antitheft that i can find. when scanner hooked up and no crank i have no rp...
1999 Pontiac Grand Am SE 2.4L flywheel VIN: 1G2NE52TXX
hello the flywheel is cracked on this pontiac 2.4l auto trans.looks like it would be easier to pull the engine rather than trans. book time says more for engine than trans. if you have been down this road i would like to know what you did. thanks in advance.
2002 Pontiac Aztek 3.4L No Start VIN: 37GA03S02S
this car won't start after a hot soak. customer has to wait for 20 - 40 minutes . have replaced both crank sensors and control module. i haven't had car not start at shop so i haven't been able to test for spark ,fuel, or noid.any help would appreciated .thank...
2003 Pontiac Montana 3.4L starter motor VIN: 1GMDX03E13
intermitant no cranking after hot soak
2004 Pontiac Grand Prix GT1 3.8L rack an pinion VIN: 2G2WP52204
Customer brought this 2004 Grand Prix GT to me. It's got a funny clunking noise when you turn the steering wheel back and forth which is very anonnying. Checked all the suspension bolts, checked the rack anpinion, it seems like it is in the intermediate shaft....

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Skylark Custom 2.3L Cuts out, Stall VIN: 1G4NV55D9S
thanks for all input, I took a stab at ignition module only because of what I was seeing on lab scope (module signals out to PCM when vehicle died). Removed module (found already replaced with junk aftermarket) Installed OE module, vehicle runs great, Thanks a...
2001 Buick LeSabre Custom 3.8L air bag VIN: 1G4HP54K81
Sorry about the delat in posting the fix. b0100 is the electronic frontal sensor. Steve and Joe gave me detailed explanation of how this system works. Once I had that and the other help from the other responders I was able to figure it out pretty quickly. It w...
1988 Cadillac Eldorado 4.5L compressor VIN: 1G6EL1156J
thanks everyone that anwered i got the fans to work change over to old refrigerant substitute and reset compresser and stays on till car is shut off then blows acc fuse every time.till im back thanks
1982 Chevrolet Corvette 5.7L Window Regulator VIN: 1G1AY8788C
I have not done this job yet (and may not do it myself), so I cannot provide any details concerning how it proceeded. I very much appreciate the three replies I received, but did not get all of the information I was looking for (specifically, information on ...
1997 Chevrolet Blazer 4.3L No Start, Stall VIN: IGNDT13WOV
Person never camed back to finish diagnostics. Please look at tech mail for some good sugestions.
1998 Chevrolet Blazer 4.3L front suspension VIN: 1GNDT13WXW
Hey Guys! I got this rat fixed finally. It was one of those deals where I couldnt have the car for as long as it took, but a little at a time and we finally found it. First, let me say thanks to all the fine folks who responded to my plea. David from NJ said...
1999 Chevrolet K1500 Suburban 5.7L interior VIN: 1GNGK26J1X
Yes there is airflow through the ventilation when cruising. Found out from customer that airflow isnt the problem but hot airflow. Read some tsbs abuot heater controls not doing what they should. Recommended replacing heater control module, but was too much mo...
1990 Geo Prizm 1.6L Timing Belt VIN: 1Y1SK5465M
Got alot of replies. All were sure that this is a non-interference engine. Thanks to all
1991 GMC TOPKICK 6.0L runs out of fuel
First of all thanks for the replies they have shed some light on this problem. I have not had a chance to do any work on this vehicle since I looked at it initially. I did receive some very good information on the fuel pump system and the description of operat...
1999 Oldsmobile Intrigue GL 3.5L battery light VIN: 1G3WS52HXX
installed 2nd delco alt and pcm checked wires to and from and still had light on left run for a while and drove it around and light went off and has not been back on
2000 Oldsmobile Intrigue GLS 3.5L MIL Lamp on VIN: 1G3WX52H7Y
I want to thank everyone for the responces. At the time i was checking out the vehicle I checked out the piping of the valves for clogging, they weren't clogged so i went on to the O2's. Testing the O2's showed me that at this time they are switching correcttl... Trouble codes: P0410.
1965 Pontiac GTO 6.5L expansion valve VIN: 237275P324
The thermal bulb is under the fender on the evap outlet and the brackets are for the power steering. Thanks
1997 Pontiac Firebird Formula 5.7L No Start VIN: 2G2FV22P5V
Customer is picking up car to tow it 2 hours away so used car lot that sold it to him can fix it... I feel it's the distributor as many of you do, as the coil checks out good with a serious load. Trouble codes: 161 (o2 heater), 420 (cat converter), 1661 (mil problem).
1998 Pontiac Grand Am SE 3.1L ABS LIGHT and ETS LIGHT VIN: 1G2NE52M9W
first of all thanks to everybody that responded to this request. i have not yet fixed this car, because the owner's car doesnot have money to fix it at this time, but i did found the problem. First i started from scratch.. i checked every ground and every powe...
1998 Pontiac Sunfire SE 2.2L Hesitation, MIL Lamp on, No power VIN: 1G2JB5248W
Suggistions were: 1. Check wiring harness very closely looking for contact points to metal that would short out wiring. 2. Many failures of EGR sticks open then gives map, tps and/or egr codes. 3. Fuel tank pressure sensor shorting had caused a egr and tps cod... Trouble codes: P0122 (TPS sensor circut short), P1404 (EGR position error), P0108 (MAP sensor circut).
2000 Pontiac Grand Prix SE 3.1L No Start VIN: 1G2WJ52J6Y
thanks for the 10 replies, most everybody still leaning towards security issuses. don't know exactly what's up with this car but it's out the door. charged the battery and replaced the 'valet' key with a regular key and have heard no more. thanks again
2001 Pontiac Firebird 3.8L No Start, Poor Idle Quality, MIL Lamp on VIN: 2G2FS32K71
found that the relay for the drive by wire was shorting out. thanks for the help guys. Trouble codes: P1518.
2001 Pontiac Grand Am SE 3.4L fuel pump VIN: 1G2NF52EX1
Seems like this vehicle is fixed. We found two suspicious looking holes in the top of the underhood fuse and relay box, Looks like maybe an alarm system was installed in this vehicle at one time and they had something attached to the fuse box cover. Some water...
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