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Prev Professional Automotive Repair Technical Discussions for May 4, 2004
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Open Help Requests for GM
Help Request Answers
1990 Buick Electra Park Avenue Ultra 3.8L electro/hydraulic VIN: 1G4CU54C1L
this car has no vacuum booster . it has some kind of electric brake system in addition to the abs system . the main customer complaint was that excessive pressure is needed to stop vehicle & panic stops impossible . i have drove vehicle & at times it felt like...
1990 Cadillac DeVille 4.5L No Start VIN: 1G6CD533OL
this car towed in off interstate abandoned car tow co. owner acquired title trying to get car running had broken steering column to start car must have been stolen car has vats system by-passed starting circuit at pass key decoder module under rh side of dash ...
1992 Cadillac DeVille 4.9L Excessive Emissions VIN: 1G6CD53B8N
car failed texas emissions test very bad low speed- hc 216 co 7.70 c02 10.6 o2 .2 nox 183 high speed hc 222 co 7.90 co2 10.5 o2 .2 nox 297 dilution was 18.4 car rans fine all the time no missing notting it smell bad like sulfur it has a lot of miles (170,00) a...
1998 Cadillac DeVille 4.6L No Start VIN: 1G6KD54Y9W
after many hours of testing. we found that disconnecting the (a) crank sensor allowed engine to run!we changed the sensor with the same problem!there is two sensors and switching them made no difference! we had a chrysler product 2001 dodge intrepid and there ... Trouble codes: P0322 (no engine speed sensor 4x), P1524 (tps code / positon not learned), P1320 (ignition control module has not recieved 44x signal), P0207 (injector problem)
1966 Chevrolet Corvette 427CID AC charge VIN: 194676S122
Looking for repair advice on this one. This is a completed, frame-off restoration in excellent condition. This is a factory AC system, R12 of course, with no refrigerant in it . Most of the components appear to be new, as does everything else on the car. Has a...
1992 Chevrolet G20 Sportvan 5.7L Excessive Emissions, Hesitation VIN: 2GGEG25K7N
this van is killing us, the ecm is commanding the egr valve open as soon as the van is put into gear and the throttle is opened. it dosent do anything funny untill it warms up. the egr valve is original and passes all the tests in alldata, the solenoid has goo...
1992 Chevrolet Cavalier Z24 3.1L Poor Idle Quality, Surge, Cuts out, Stall VIN: 1G1JF14T2N
ok guys can not figure this one out best part about it is my sons car hahaha ok been doing this for about 19 years this thing is makeing me crazy . here we go this thing runs good hot when it warms up is run great but stone cold it will not idle at all untill ...
1996 Chevrolet Cavalier LS 2.2L Stall VIN: 4G1JF3241T
This is a convertible and was parked in the owners shop over the winter due to a bad top. Ran fine when it was parked, no mil light. Battery was still up 2 weeks ago when they tried to start it. Started right up but would die after 3-4 seconds and anti theft l... Trouble codes: P0107 (map sendor low input), P0122 (tps low input), P0753 (shift solenoid a), P0758 (shift solenoid b)
1997 Chevrolet K1500 Suburban LS 5.7L trans. case VIN: 1GNFK16R8V
After driving about 15 minutes, a whine slowly develops at about 65 mph that after extensive testing we found that by engaging 4wd and then engaging 2wd the whine will go away for about 15 minutes and then slowly come in again. Also, when re-engaging 2wd, it t...
1997 Chevrolet Malibu LS 3.1L engine, camshaft VIN: 1G1NE52M6V
vehicle came in customer said that vehicle lost power and cut off, removed valve covers and discovered that rockers for cylinders 3 & 5 and 4 & 6 were not moving. we have seen this before on another malibu same year and configuration, we suspect that as before...
1998 Chevrolet K1500 Cheyenne 5.0L Misfire, MIL Lamp on VIN: 2GCEK19M8W
this is the boss' truck and when he tows a boat or camper on any kind of pull or locked in cruise it throws a missfire light. the only thing thats not new in this truck is the engine itself. if anyone has seen this any help is greatly apreciated. Trouble codes: P0300
1999 Chevrolet K2500 Suburban 7.4L Rear shoes VIN: 1GNGK26JXX
Brakes will get very "grabby", customer will bring truck in fro rear brake adjustment and everything is fine for a couple of months. Then same thing. We have double checked installation several times. With drum off, brakes can be applied to point before wheel ...
1999 Chevrolet Lumina 3.1L MIL Lamp on, BOGS OR SLIPPAGE VIN: 2G1WL52MX9
Customer complaint was originally possible transmission slippage only when it rains. Ignition system and entire engine was sprayed heavily with water, power braked and driven. Checked ALLDATA for bulletins and IATN. Could not duplicate problem. No engine or tr... Trouble codes: P0502 (vss signal low)
1999 Chevrolet K1500 Suburban 5.7L Fuel Pressure Regulator VIN: 3GNFK16R0X
Hi guys, Gotta wierd one here, this sub came in rattlin' like hell when cold, would stop after 15 minutes of driving. Found 6 collapsed lifters, so replaced them all. After reassembly, the clatter is gone, but the fuel pressure regulator is buzzing LOUDLY! Ve...
1990 GMC K1500 Sierra 5.0L brakes VIN: 2GCDK14H2L
new master has been installed, 80% front and back linings rear shoes adjusted.blead system a number of times. customer compaines the light on and the peddle fades to the floor. onroad test the peddle is fine but the light comes on when brakes are hot. cus has...
1990 GMC K1500 Sierra 5.0L brakes VIN: 2GCDK14H2L
new master has been installed, 80% front and back linings rear shoes adjusted.blead system a number of times. customer compaines the light on and the peddle fades to the floor. onroad test the peddle is fine but the light comes on when brakes are hot. cus has...
2000 GMC Yukon SLE 5.3L Heater box VIN: 1GKEK13TYJ
Hi guys, this Yukon came in December with the customer complaining of cold air blowing on the passengers feet. The air seems to be coming from under the dash and not the vents. This condition occurs when the heater controls are set in fresh air mode. The cust...
1988 Oldsmobile Cutlass Calais SL 2.5L speedometer VIN: 1G3NT14U9J
customer complaint of speedo inoperative,analog dash. {"stopped just after completing our state IM240 test"}tested and verified vss signal to pcm,good/strong signal.verified vss signal from pcm to dash,good proper signal.checked pos/grnds at instrument panel,a...

Fixes & Summaries for GM
Fix/Summary Answers
1990 Cadillac DeVille 4.5L Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G6CD533XL
Hi Folks, Finally got this one fixed. Following one response email I did a voltage drop test from the negative of the battery to the ground wire at the ECM (Red with black stripe). With the ignition on there was a 5.6 volt drop. When the engine started it jump... Trouble codes: 41 (No reference pulses to ECM).
1992 Chevrolet Cavalier RS 2.2L Poor Idle Quality, Hesitation, Stall VIN: 1G1JC144XN
First I wish to thank all 16 of you that replied to my help request. After much testing I decided to replace the ECM. Remans are hard to get, have to order them, no one stocks them locally. We picked up a used one from a wrecking yard and it has fixed this car...
1997 Chevrolet Blazer 4.3L cylinder heads VIN: 1GNDT13W9V
Thank you to all that took the time to respond.Half of the responces said to use JB weld to repair the pitted areas, and half said to use just silicone. JB weld is a great repair for minor pitted areas that are surrounded by relatively sound metal. The pitted ...
2000 Pontiac Grand Am GT 3.4L wheel speed sensor VIN: 1G2NW12EXY
Thanks to all who replied. Most responses pointed to the harness between the sensor and the EBCM.We informed the customer that the harness should be replaced but she decided to take it to the dealer she had bought the car from and let them do it. Well, the nex...
2000 Pontiac Grand Am SE 2.4L antitheft VIN: 1G2NF52T9Y
thank you to all who replied. replaced ingition switch (with hall effect sensor) let customer drive for several weeks with no more trouble.
2001 Pontiac Grand Am GT 3.4L Hesitation, Surge, MIL Lamp on VIN: 1G2NV52E61
Turned out the catalytic converter was plugged up, as indicated on an exhaust back-pressure guage. I thought the situation improved (in town speeds) with egr wire unplugged, customer needed car back with not enough time for us to do further check that day, and...
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