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Prev Professional Automotive Repair Technical Discussions for September 24, 2012
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Open Help Requests for GM
Help Request Answers
1998 Chevrolet Tahoe LS 5.7L Unknown VIN: 1GNEK13R6W
I got this Tahoe with a cracked flywheel, It has a newer reman motor installed by another shop and they didnt tighten the bell housing enough and the flywheel cracked, I put in a new flywheel and fired it up, has a cyl #3 miss fire at idle only, has new plugs,...
2001 Chevrolet Tracker LT 2.5L Ammonia Smell VIN: 2CNBJ63461
Vehicle came in with complaint of ammonia smell on acceleration. Test drove and accelerating to highway speeds with the window up could not smell anything. With the passenger window open, when I accelerate to highway speeds the smell of ammonia was present alo...
2001 Chevrolet Suburban 2500 8.1L Ride control VIN: 3GNGK26G31
Cust was driving over large holes when camping and the service ride control light came on. scanned the ecm and had 2 codes. c0580 and c0620. Thanks ahead for any help.
2004 Chevrolet Avalanche 1500 Z66 5.3L Steering VIN: 3GNEK12T74
2004 Chevy Avalanche has a vibration/groaning noise in the steering once the vehicle has warmed up. The p/s hoses to the O.E. p/s cooler start to vibrate when the noise occurs. It happens most when you turn the wheel 1/2 a turn to lock. It sends the noise up t...
2004 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC52FX4
Another GM nightmare for me! This Cavalier is going to auction, and the dealer told us it needed a new fuel pump because of a no-start and no-fuel issue. We got it and it started up sometimes, and other times not. We found the fuel pump relay working sporadi...
2004 Chevrolet Impala 3.4L no speedometer
No speedometer on this car. I have odometer. Scanned on road test and mph shows right on scanner at all speeds. I know GM has alot of problems with clusters. Customer doesn't have much money. Our gm dealer said they have to do this job if a used cluster is put...
2000 GMC Sierra 1500 SL 5.3L high steering effort VIN: 2GTEK19T5Y
problem occures when backing out of a parking space while turning the steering to the right it feels like all power steering assist goes away. I have inspected all ball joints and tie rods for binding all seem good. the pump was replaced a month back for the s...
2005 GMC Safari 4.3L Misfire, MIL Lamp on VIN: 1GKDM19X65
I have an 05 Astro. Just installed a new jasper 4.3 and an install kit. Engine ran fine just the thrust bearings were bad. I now show misfires on #1 and #4 cylinders but only @ 2000-3000 rpm free reving or light or heavy load. The vehicle does not feel or appe... Trouble codes: P0300
2001 Saturn L300 3.0L No Start VIN: 1G8JW54R31
Initially the car came in 2 weeks ago for a no start. We diagnosed the problem, replaced the fuel pump with a Delphi unit. Engine started. Customer paid bill and left. Less than 48 hours later, she called, engine does not start. We towed it back and upon diagn...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Century Special 3.3L engine VIN: 1G4AG54N5N
Wow what a fantastic response! Thanks to all who replied. Special thanks to Joseph [...]'Antuono who clued me in that a crank sensor failure would cause loss of injector signal as well as spark. It turned out that even though I had done a pin to pin ohms test on t...
1972 Chevrolet C30 Pickup 6.6L brake booster VIN: CCE532V107
Thanks for all the help. First of all the truck was a c50 not a c30 like I said. I found a place in Portland OR that has rebuilt boosters for a reasonable price. Thanks for the leads.
1998 Chevrolet Corvette 5.7L Power windows, power door unlock VIN: 1G1YY32G0W
Power supplies were load tested (headlamp) and both power and ground circuits passed (10 amp and 25 amps circuits) Data line tested back to DLC Pin 2, drivers side showed some resistance, passenger side tested good. Also found that using the convertible top ...
2002 Chevrolet Venture LS 3.4L No Start VIN: 1GNDX03E82
This one is fixed and out the door. Got alot of good replies mostly saying that getting the PCM back on board was the first step. I had noticed the check engine light did not come on when the key was on and this turned out to be the main issue. The first thing... Trouble codes: U1000, U1096, U1040, U1305.
2008 Chevrolet Express 2500 4.8L Parking Brake VIN: 1GCGG25CX8
Thanks to all who responded to this issue. After removing and spending some time trying different things with the pedal assembly, I got it to release by pushing up on the spring that puts pressure on the adjuster drum, therefore creating more pressure on it an...
2005 GMC Savana 3500 SLE 4.8L brake system VIN: 1GDGG31VX5
Dan, Willard and Scott, you were right. the lt rear caliper [...]. Robert, you were right. one rear caliper pin on each side, the lowers to be specific, were siezed. actually couldn't get ...
2005 GMC Sierra 3500 SLT 6.6L injection VIN: 1GTHK332X5
Thanks to all that replied.I did install the TSB kit for the #2 and #7 injector connector and the updated braces for the wiring harness.also found the last monkey had broken a retainer on the #3 injector connector,so i replaced it before eversincya, came back....
1990 Pontiac Grand Prix LE 3.1L Stall VIN: 1G2WJ54T5L
I appeciate all the replies, Since we already knew that I had bad resistance on two injectors especially the 6.8 reading. We told the customer thatwe were going to pull the plenum and replace all the injectors that were out of spec. He decided not to fix this ...
2005 Pontiac Grand Prix GT 3.8L MIL Lamp on VIN: 2G2WS52205
well to those of you who mentioned signal wire, you were half right... found a crack in the cross over pipe between the manifolds. the exaust leak was setting the p0134 code. replaced the pipe and the code went away. I then discovered the low signal wire to th... Trouble codes: P0134.
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