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Prev Professional Automotive Repair Technical Discussions for August 5, 2005
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Open Help Requests for GM
Help Request Answers
1992 Buick LeSabre Custom 3.8L No Start, Cuts out, Stall VIN: 1G4HP53LON
Problem is very intermittent. Customer says the vehicle stalls as if you shut the key off. I'm thinking ignition module, crank sensor, or ECM fault. I tried tapping and wiggling wiring to all of these, but nothing conclusive. The customer said the last time it... Trouble codes: 17 (RPM Signal Problem)
1994 Buick Skylark Gran Sport 3.1L No Start VIN: 1G4NM15M9R
hello techys, this one has me stumped. the car came in a the tow truck with a no start. the customer said the car was running great then all of a sudden lost power. and will not start again. at the shop here the car turns over and acts like it wants to start. ...
1998 Cadillac DeVille 4.6L abs/traction lights VIN: 1G6KD54Y4W
someone please help this car is driving me crazy i have replace the control module and the ws sensor on the rr for the code c1228 excesive wheel speed right rear. I noticed that the rough road parameter stays at .995 now and when I did the first repair it woul...
1991 Chevrolet S10 4.3L Poor Idle Quality VIN: 1GCCS14Z2M
This truck when idleing it will race up then lean out and die. The IAC is working it tries to open and keep it from dieing but too late. The only thing I thought was that the intake gasket is leaking into the oil valley or something like that. Any help would b...
1993 Chevrolet Caprice Classic LTZ 5.7L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1G1B00070P
Car would stall after warm up, runs fine cold, poor idle quality, stumbles, misfires, hesitates on accel. I have another one on the lot, so I swoped some parts back and forth to see if any improvement, none. No codes or chack engine light.
1997 Chevrolet Astro 4.3L power steering VIN: 1GNDM19W1V
this vehicle has no power steering, also has very poor brakes. Does have hydroboost. Fluids are fine no leaks.Acts like pump died, looking for ideas. This also has an electronic variable solenoid on ps pump is this a problem? Not really familiar with this newe...
1998 Chevrolet Express 1500 4.3L turn signal VIN: 1GCEG15W3W
Ok, Everything is great on this vehicle except the turn signals flash very fast. All bulbs have been checked, hazards don't flash fast. Have tried a new oem flasher with no change.
2000 Chevrolet Express 3500 6.5L Surge VIN: 1GBJG31F0Y
This cubevan has a surge going up hills .the computer is opening and closing the wastegate. It set some bosst pressure related codes in history but I think they were caused by another tech looking at the vehicle.scan data shows no other input changing that coi... Trouble codes: P0236, P0230, P1656
2000 Chevrolet Blazer LS 4.3L transfer case VIN: 1GNDT13W7Y
Need help here guyes. This blazer customer states four wheel drive activiates by itself every once in a while. Feels like vehicle is in a bind when it happens. All dashlights on four wheel drive switches light up when it happens. Scan for codes. Found U1026. P...
2000 GMC Sierra 2500 SL 6.0L fuel gauge, air bag light, horn VIN: 1GTGK29U6Y
Vehicle came in with multiple issues. 4 codes that keep coming back: P0122 TP or ACC Sensor 1 ckt shrt/low P0157 O2 signal low B2 S2 P0463 Fuel level sensor ckt sig high/open P1122 TP ckt intermintent low voltage The fuel gauge sometimes works, i wiggled the...
1991 Oldsmobile 98 Regency Elite 3.8L Poor Idle Quality, Hesitation, Surge, Misfire, Poor Fuel Economy VIN: 1G3CW53LM4
Car started about a week ago just missing under heavy accel. on the highway and now even runs rough. Runs great at idle, but under load seems to break down. Ign. timing seems to retard when accel. under load with brake on. Any ideas.

Fixes & Summaries for GM
Fix/Summary Answers
1987 Cadillac DeVille 4.1L Display VIN: 1G6CD5186H
Special thanks to Randy [...] whose instructions were to unplug the fuel info & c/c push buttons individually to see which unit was defective. The climate control unit was bad. The parts store had rebuildt push buttons on the shelf. The displays came back to lif...
1998 Cadillac DeVille 4.6L engine VIN: 1G6KF549XV
most of you were right, it was a bad head gasket, left bank, installed time serts and new gaskets, drove for 6 to 8 hours and no problems. thanks for the help.
1999 Cadillac Catera 3.0L No Start VIN: W06VR52R2X
Hello, A mass air flow sensor fixed this car. Three of the four responses I received pointed me to the security system, which wasn't active according to the scanner and the dash light. The other response we got said that the crank sensor may be the cause. ... Trouble codes: P0650 (MIL Control Circuit).
1999 Cadillac Seville STS 4.6L alt VIN: 1G6KY549XX
Of the 3 emails I recieved, The alternator seems to be the problem most indicated since there are 2 choices of alternator available. We couldn't get the customer to go for a new A/C delco unit. The customer picked up the vehicle and said he was going to trade ...
1990 Chevrolet Corvette 5.7L air bag VIN: 1G1YY2381L
Thanks everybody for your inputs, in the case of that Corvette we finally had to replace the derm module and it solved the problem of the air bag light being on all the time. I still don't understand why the derm went bad just by unplugging the steering air ba...
1998 Chevrolet Express 1500 4.3L No Start, Poor Idle Quality VIN: 1GCEG15W3W
Ok, a couple of you nailed it. Many posts about the sensor, but the problem was the computer. It was sending only 2v reference to the CTS. New computer fixed it all. Thanks to all.
1999 Chevrolet Silverado 2500 6.0L Hesitation, Back fire VIN: 1GCGK29U0X
Customer has not brought the vehicle back. Some useful information might be carbon build up on the intake valve acts like a sponge with the fuel and once the vehicle has run for a little bit the sponge fills up and then it runs fine. Trouble codes: P0137, P0157.
2001 Chevrolet Impala 3.4L level senser VIN: IG1WF52E21
well i had a few replies that told me that if the coolant is contaminated that will trigger the light so i ran 10 gallons of water though the exchanger refilled the system with anti-freeze ,light seem to stay off...thanks for the help.. I did not know that con...
1994 GMC K2500 Sierra SL 6.5L engine VIN: 1GTGK29F6R
All the information that I received was great but to no avail at fixing my problem. I still have the problem and will deal with it one day at a time. We are still trying things but have yet to try the right thing. Thanks to all who tried.
2001 Oldsmobile Intrigue GL 3.5L Dash lights, ignition/fuel
The customer agreed to bring back if the problem worsened or became more consistent. I have not seen the customer back. The general census was ignition switch - which we could not confirm. Another was wire connection by drivers feet which I couldn't check sinc...
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