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Prev Professional Automotive Repair Technical Discussions for January 5, 2005
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Open Help Requests for GM
Help Request Answers
1991 Buick Skylark 2.5L Poor Idle Quality VIN: 1G4NV54UXM
Car was towed in for no start. Customer said it had been loosing power and then quit. Scanned for codes and found none. Cranked engine over and fuel spray comes out of throttle body. Removed 02 sensor and found no back pressure. It looked like there was to muc...
1994 Buick Park Avenue 3.8L Battery VIN: 1G4CW52L7R
This car has an over night drain of the battery. The battery is new and tests good. The alternator tests good and the diodes are fine. None of the courtesy light stay on but the radio clock stays on all the time in this car even after the key is off. Don't kno...
2000 Buick LeSabre Custom 3.8L engine, trans,body VIN: 1G4HP54K5Y
Hello and Happy New Year to all! We have a strange but interesting problem with this Buick. Customer had outer tie rod ends replaced and alignment done 3 months ago. Customer complaint of a vibration @ 40 mph under very light acceleration. Our test drive confi...
1984 Cadillac Seville 4.1L blower fan VIN: 1G6AS6983E
have a 84 seville (nice condition) that has an inop blower fan. if you hold down off and warmer it will not go into diagnostic mode. if you ground the blower fan it will run and draws 15 amps. problem is that i have no info for this vehicle. i have a 85 se...
2000 Cadillac DeVille 4.6L Cooling Systems VIN: 1G6KD54Y7Y
I have a 2000 Caddy 4.6 with a coolant leak dripping down the center of the block right above the engine mount and down onto the pan and exaust crossover. It will not leak under a pressure test and will not leak all of the time. It doesn't seem to be comming f...
1989 Chevrolet Camaro Iroc-Z 5.7L poor idle VIN: 1G1FOP218O
Good Evening Everyone Hear is my problem This Camaro was towed in with hydraulic lock up "most cylinders filled with fuel " We pulled the plugs,drained the oil and checked fuel pressure 78-80psi running or not.We pulled the fuel regulator and replaced it.Start...
1996 Chevrolet Cavalier 2.2L amp light on VIN: 3G1JC1243T
I have a strange one here. Replace timing gears and chain. Car run OK and there are no codes, but amp light is on. The alt. is putting out 14.6 volts. I do not why the amp light is on because I never touched the alt. Thanks in invance to anyone that helps.
1996 Chevrolet Express 3500 5.7L No Start VIN: 1GCGG35K9T
Hi Guys, Ill make this as short as possible. I have this van on a dealers lot that will crank no start. The dealers lot boy put a new GM fuel pump in it just as a guess I suppose. Still wont start. Heres where I come in. Hook up scanner and get NO COMMUNICATIO...
1996 Chevrolet Camaro 5.7L L.F speed sensor VIN: FG5RT76774
We first received this vehicle with a baked tranny so we couldn't test drive then. Customer wanted tranny rebuilt and a tune up (Z-28, about a 5 hour tune up!!)We test drove vehicle after repairs probably 2-3 miles, everything fine. Customer returned next day ...
1997 Chevrolet Corvette 5.7L no acel VIN: 1G1YY22G2V
power loss trac control lights both come on then no control of acel pedal Trouble codes: P1221 (tp sensor 1 and 2 performance), P1515 (command vs actual tp performance pcm), P1516 (command vs actual tp performance tac)
1996 GMC Sonoma SLE 2.2L Misfire VIN: 1GTCS1943T
misfire on #1 cylinder... have good spark and good comp just no bang figured fuel inject no prob, replaced and still have miss ... check injector pulse 2.3ms at idle , same as others vac leaks. am stumped anybody have any ideas?
2001 GMC Safari SL 4.3L No Start, Misfire VIN: 1GTDM19W31
Recently we have had multiple problems with GM/Chevy 4.3L distributor caps that are collecting moisture. This even occurs on caps replaced as recently as two months ago. Of course if we dry the caps out & then reinstall...everything works fine. We have checked...
1992 Pontiac Bonneville SE 3.8L Starting VIN: 1G2HX53L7N
this is my own car, the car was workin great then when the cold weather hit it fails to start.checked the fuel pump it is ok, put the scanner on the car it said it was the crank sensor i replaced it with 3 still no start. replaces crank sensor, ignition module...
1994 Pontiac Grand Am SE 2.3L Poor Idle Quality, Misfire VIN: 1G2NE5539R
Hello,I have a misfire on this car, the first time it came in I was going to find what cylinders were affected.I removed #1 inj. connector and plugged it back in and the misfire was gone.I inspected the connector closly and ohmed the injector,everything seemed...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Cadillac DeVille 4.9L Poor Idle Quality, Surge VIN: 1G6CD53B1P
Customer has not yet returned to have repair completed. Based on replies, I plan to replace the distributor gear. All other replies I have checked out already, with no success. (tps, isc, idle relearn, bad ground, etc). Thanks for all the help. Wes Trouble codes: E30 (idle speed control circuit problem).
1991 Chevrolet Corsica LT 2.2L Misfire VIN: 1G1LT53G1M
ground to module had high resistance. after i cleaned connection vehicle was fine thanhs for all your help.
1996 Chevrolet Lumina 3.1L No Start VIN: 2G1MN52MOT
thanks Doug it was the crank sensor that corrected the problem. By the way scanner was showing crank signal, must have not been strong enough under load ? Not sure why but runs great.
1998 Chevrolet Malibu LS 3.1L Misfire, MIL Lamp on VIN: 1G1NE52M7W
thanks to all who replied. For some reason we were trying to run down the misfire proplem first. As most of you said the EGR was at fault(Stuck partially open). We replaced it and have had no further issues. thanks for all your help Trouble codes: P0300, P0404, P1404.
1999 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52JXX
Hello Guys and Girls First I want to thank everyone that took the time to help me with this car Brian [...]. All you guys are wonderful,,, to get to my...
2002 Chevrolet Trailblazer LS 4.2L codes P1633, B1440 VIN: 1GMDT13S42
Thanks for the responses. The problem was a loose terminal in the power distribution center under the hood. The terminal fed fuse 34 which went to the ignition switch. The terminal was spread open causing an intermittent open loop circuit. The Blazer actuall... Trouble codes: P1633, B1440 (Ign 0 voltage loss to BCM).
1995 Oldsmobile Achieva S 2.3L Poor Idle Quality VIN: 1G3NL55D6S
First of all I would like to say thank you to everybody that took the time to reply. Going back and looking at scan data when car is cold, I found that all of the data coming from the computer was freaking out running or not. Just about every output would re...
1998 Oldsmobile Bravada 4.3L blend air door VIN: 1GHDT13W2W
this vehicle was picked up without a fix from my shop i wasnt comfortable throwing parts at it and with no datastream i felt there was still too much of a chance i was just guessing
1997 Pontiac Grand Am GT 2.4L abs module VIN: 1G2NW12T6V
The tone wheel had slight hair line crack. Thanks To All Who Helped
1997 Pontiac Grand Prix SE 3.8L power assist VIN: 1G2WP52KOV
Thank you for all replies. A couple people suggested the stereing shaft angle sensor could be causing problems, much like the GM trucks. This system does not have that sensor, but it was a hopeful thought. Another sent me the entire text of GM's recall on ...
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