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Prev Professional Automotive Repair Technical Discussions for November 16, 2006
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Open Help Requests for GM
Help Request Answers
1998 Buick Park Avenue 3.8L Mechanical VIN: 1G4CW52K6W
just finished installing a new set of heads and new upper intake maniflod. after starting vehicle for first time. it runs fine but i noticed crankcase is drawing vacuum. dont see any pcv valve. i dont believe this normal. has anyone come across this before?
1998 Buick Park Avenue 3.8L starter VIN: 1G4CW52KXW
Sometimes won't crank, has new battery, cables ect. cleaned tested, alternator charges normally. Will crank with additonal attempts and start, however gear selector indicator and other dash functions seems to be inoperative or erratic and linked to part of or ...
1999 Cadillac DeVille 4.6L No Start VIN: 1G6KD54Y9X
Hey guys, I hope someone can help. This car came in running and I did alot of work to it now the theft deterent does not let me start the vehicle. It does crank, that tells me the key pellet is good. Also found passkey 55 in the IPC display data which is measu... Trouble codes: P1631, B2750
1999 Cadillac DeVille 4.6L compressor VIN: 1G6KD54Y4X
replaced a/c system in june all new parts. was working great until weather cooled off, first warm day wanted to use a/c compressor would not engage. have power on all swithches and relays. all fuses good. do not have power at compressor and pcm will not ground...
2000 Cadillac Escalade 5.7L fuel gauge VIN: 1GYEK63R2Y
gas gauge needle is pointed at the right line on the gauge but it vibrates rapidly in place. had recent new fuel pump (ac delco ) so i thought maybe the sending unit was defective but a new replacment didn't solve the problem. redropped the tank to make sure ...
1996 Chevrolet Blazer 4.3L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1GNCT18W4T
I've been playing with this vehicle off and on for about a month now...(belongs to a friend) The only code present is a misfire code... I can get this thing to do it almost all the time but it is really bad when its cold. It hesitates on take of, and at part t... Trouble codes: P0300
1998 Chevrolet Corvette 5.7L door control module VIN: 1G1YY22G6W
We dont get many corvettes in this shop so I am not sure what to do. The problem is that the service vehicle soon message is on the display unit so I pulled the codes with the tech 2 and found that the left and right door modules have codes b2283 battery fault...
2000 Chevrolet Tracker 2.0L Speedometer VIN: 2CNBJ13C8Y
Speedometer and odometer are inop. This vehicle has been in a frontal impact accident. It has new hood, fenders & grill. Pulled test proceedure from Shop Key and all tests were good. Looked at VSS output with Tech 2 and it tracked MPH correctly. Tested wiring ...
2003 Chevrolet Cavalier 2.2L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1G1JC52F13
The first time the vehicle came in it had multple cyl. misfires. checked and found #2 & #3 misiing spark. checked allsystems and replaced ba plugs and coil pack and boots. a month later vehicle came back with same problem. Checke again and found no signal from... Trouble codes: P0300 (multiple cyl. misfire)
2003 Chevrolet Silverado 1500 4.8L Air bag- SRS VIN: 2GCEC19V83
Vehicle is in for airbag light on- we see code B0084 for drivers seat position sensor circuit. We examined both front seats wiring as good as possible w/o removing seats and it appears all connected, non broken. There was no flood entry on this rig. We replace...
2005 Chevrolet Express 1500 5.3L rear of truck VIN: 1GBFG15T15
This is my personal van and I bought it new in June of 2005, ever since the first day I've been getting a very intermittent clunk from the rear of the truck. It's been back to the dealership 4 times for the same problem. First time back to dealership they chec...
1996 GMC Jimmy 4.3L Hesitation VIN: 1GKDT13W9T
I removed the cat converter, due to low vaccum on acceleration, to check for an exhaust restriction. There was none. If you spray ether at the intake on accel. the hesitation disappears. I was wondering what the fuel volume should be? I have 1/2 pint at 15 sec... Trouble codes: 131 (o2 bank 1 slow response), 151 (o2 bank 2 slow response), 171 (system too lean)
1994 Oldsmobile Cutlass Ciera 3.1L Excessive Emissions, Poor Idle Quality, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G3AG55M1R
car is running rich no miss fire codes checked out catalytic conv. looks fine. has no power stumbles in gear. sent out ignition modual checked out ok. have a cam sensor code don't know if that was existing before it ran poorly. ect temp sensor looks like it is... Trouble codes: P0342
1995 Pontiac Trans Sport 3.8L Cuts out VIN: 1GMDU06L1S
Thanks in advance. Customer is complaining of an intermitant cutting out (not stalling) It has a very intermittant check engine light with no codes. I am leaning to a bad crank sensor but i was looking for some input. Thanks Mike P
1997 Pontiac Sunfire SE 2.2L running VIN: 5G2JB1243V
the car will run for days, stop for work will not run for going home, wait till morning car starts,good for days or day,will not start,tune up done,scans ok,battery new.car will turn over all the time.
1998 Pontiac Grand Prix GTP 3.8L Misfire VIN: 1G2WP5218W
po300 random cyl misfire. Customer droped it off the night before. I got in it first thing in the morning with the scan tool and looked at all the cylinders to see which ones were misfiring. All cylinders were misfireing and I could barly drive it. Then it cle... Trouble codes: P0300
2000 Pontiac Grand Am SE 2.4L Misfire, MIL Lamp on VIN: 1G2NF52T2Y
customer came in with vehicle missing. said they had it at another shop which had to replace the coils every 3 or 4 months to get it to stop missing. so we went to work on it and at idle it was missing on cyl 2 & 4 and missing on number 4 only under a load. fe... Trouble codes: 300 (multiple cyl. misfire), 420 (twc low efficiency)

Fixes & Summaries for GM
Fix/Summary Answers
1997 Cadillac DeVille 4.6L Poor Idle Quality, Cuts out VIN: 1G6KD54Y4V
Well I didnt think a couple lbs of fuel psi would make that much a difference. Replacing the fuel pump module fixed the car. It has started every morning since replacing the pump. Thanks for all the help to everyone. Trouble codes: P0300 (multi misfire).
1997 Chevrolet Astro 4.3L Hesitation, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNDM19W4V
Thank you very much to all who responded. Most said it was the spider tubes in the FI. I have repaired many of these but they all had a gas smell and/or a rich condition. This one didn't. A few said intake gasket. This van has had the long life anti-freeze rem... Trouble codes: P0300.
1997 Chevrolet Corvette 5.7L Magasteer 2 VIN: 1G1YY22G4V
It was the steering wheel position sensor, just as five out of the five replays it got said. I have only driven the car a few miles but no codes set. Before I installed the new SWPS it would set code C1281 just turning the steering wheel with out moving the ca...
1998 Chevrolet Tahoe LS 5.7L Stop Lamp VIN: 1GNEK13R9W
Well this one is fixed. Previously before posting I had checked the D pin on the brake lamp socket and confirmed 12v with pedal off and 0v with pedal on while watching the scanner stay locked on “switch closed”. Edwin [...] pointed out that I should dis...
2002 Chevrolet Tahoe LS 5.3L No Start VIN: 1GNEK13Z82
..the customer has decided to take the car to the dealer which is probably a good choice. Several posts mentioned the coolant temp. sensor which was checked and found to be ok. one post mentioned usimg a Tech 2, but we don't have access to one.. my lack of kno... Trouble codes: P0178, P0179.
2003 Chevrolet Silverado 1500 4.8L vehicle continues to run after key has been turn o VIN: 1GCEK19V03
A special thank you to Dwayne [...], you nailed it. Thanks to everyone else too, for all the other great suggetions. We ended up finding out that the vehicle had been invaded by mice they chewed a few wires & peed into the fuse block. This caused a short & corr...
2004 Chevrolet Silverado 3500 LT 6.6L goes into limp mode VIN: 1GCJK33224
hey thanks for the help in sending my down the right path. after following the trouble shooting charts it shows that my injectors are fine and wireing harnnes are ok. im getting the wrong voltage out of the FICM to the injectors. the connectors at the FICM loo... Trouble codes: P0202 (cylinder 2 - injector circuit problem), P2149 (inj position voltage control circuit group 2).
1997 Geo Prizm LSi 1.6L No Start, Hesitation, Stall VIN: 1Y1SK5264V
After spening many hours searching through archived repairs last night I had developed a battle plan, then first thing this morning rechecked site for any new replies and... DING DING DING WE HAVE A WINNER!!! Had one reply right on with my plan, although i had...
1997 GMC Savana 3500 5.7L Hesitation, MIL Lamp on VIN: 1GTHG35R3V
thanks for all your help on this one. turns out maf sensor was bad.installed new one (ac delco)and has been gone for few weeks with no complaints. thanks agin for the help. Trouble codes: P0101 (maf), P0131 (o2 signal low bank 1 sensor 1), P0151 (o2 signal low bank 2 sensor 1).
2005 GMC Sierra 2500 HD SLE 6.6L MIL Lamp on, low power VIN: 1GTHK23215
Performed the bulletin for wiring and new connectors. Trouble codes: P0207 (Cylinder 7 injector circuit problem), P2146 (Inj Pos Voltage control Circuit Group 1).
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