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Prev Professional Automotive Repair Technical Discussions for June 24, 2011
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Open Help Requests for GM
Help Request Answers
1956 Cadillac Series 62 6.0L Camshaft VIN: CA56E50415
The fuel pump on the low mileage(34,000) Cadillac was by-passed with an electric unit and now the owner wants to repair the mechanical pump. The problem is the pushrod stroke is not suffient to operate the pump.Of course I will pull the pump ,check the pushrod...
1992 Cadillac DeVille 4.9L No Start VIN: 1G6CD53B1N
I have a 92 cadilac deville with intermitant no start. Injectors pulse once when first crank. Had no comunication with pcm and was getting signal from dist to pcm.replaced pcm, now have comunication but still intermitant no start. Did set code 58, passlock pro... Trouble codes: 58 (passlock problem)
2002 Cadillac Escalade EXT 6.0L parking lights VIN: 1GYEC63TX2
The parking lights will go out if i remove the int prk fuse. I have unplugged the headlamp switch, the bcm, the parking light relay, removed head light assbly, tailights with no change. Thanks for time, Scott
1982 Chevrolet C20 Silverado 6.2L Poor Idle Quality, Stall VIN: 1GTEK14CXC
this vehicle when running acts like it is over fueling, lots of smoke out tailpipe blueish, after a while will start burning your eyes, have not worked on many of these old beast, there is 12 volts to injection pump, took a fuel sample it looks ok and smells l...
1992 Chevrolet C2500 Silverado 5.7L Radio VIN: 2CGCGC29KO
This is my truck. For years I had a Sirius system in it. I took that out and now listen to AM talk radio. My problem is I live 50 to 60 miles from the stations. My radio has a high-pitched static whine that is not engine speed related but stops when the engine...
1994 Chevrolet Astro 4.3L Rear Brakes VIN: 1GBDM19Z1R
THANK YOU FOR TAKEING THE TIME TO HELP. I have a 94 astro that the rear brakes lock up on the lightest pedal app. Have changed entire brake system (see related repairs). Brakes ok for a week or so than will lock up again. Have marked adjusters to see if over a...
1995 Chevrolet C3500 7.4L Upshift/Output Speed VIN: IGDGC34N9S
I first checked power to trans it is good, then saw intermittent output speed cutout, changed the output speed sensor no change. checked the output speed on a scope both at the trans and at the drac module saw good waveform, so i checked the digital output of ...
1997 Chevrolet K1500 Suburban 5.7L Front Unit/AC VIN: 1GNFK16R5V
The front unit only blows cold air when the rear unit is turned on. Both front and rear then blow cold air.
1997 Chevrolet K2500 Silverado 6.5L Stall, MIL Lamp on VIN: 1GTGK29F9V
this truck came in my shop by towing,it start but run only 5-6 seconds and the engine run at wide open trottle , and the exaust smoke goes out the exaust a very lot and black, p 1218 is always on and the resstor is in place.when the engine run (5-6 sec) the in... Trouble codes: P1218
1999 Chevrolet Silverado 1500 LT 5.3L Oil Use VIN: 2GCEK19T3Y
this one was brought to me because i work on there other car. the complaint is it uses a quart of oil between changes-every 3,000. i know i could say that is normal, but my customer was told at the dealer that a "gasket set" will fix it, i cannot contact anyon...
2000 Chevrolet Tahoe 5.3L battery light VIN: 1GNEK13T9Y
This vehicle came into my shop with a new alternator, battery light comes on and off while driving. We tried another alternator, a different instrument cluster, and a different PCM. Went through all test, could not find a problem. Connected a scope to the grey...
2002 Chevrolet Monte Carlo LS 3.4L Delay VIN: 2G1WW12E82
Wipers will stop straight up and down in between delay cycles, but they do park normally, crank arm appears to be tight and functioning properly and the tab on the transmission bracket was slightly bent so I adjusted it but as I said the wipers do park correct...
2004 Chevrolet Impala 3.8L 2-1 downshift noise VIN: 2G1WF55K84
Problem has developed about 15k miles ago. While trans automatically downshifts during normal slow down at about 15 mph (2-1 shift) there is a loud buzz noise and trans pressure rises from ~ 75 psi to 150 psi - foot off gas. Sometimes lasts for 2-3 seconds, so...
2005 Chevrolet Silverado 2500 HD 6.6L Crank reluctor VIN: 1GCHC242X5
Came in with a P0335 crank sensor code. Found new sensor fitted. Removed sensor and while viewing with a magnet and cranking the engine can see the reluctor wheel is bent. Cannot find any procedure or time to repair this. Can someone give me a heads up on this...
2006 Chevrolet Cobalt LT 2.2L Smoking/Using Oil VIN: 1G1AL55F66
This 2006 Cobalt with only 63K miles on it is using a quart of oil every 100 miles. It has 175 to 185 psi compression in each cylinder, and the leakdown test checks very good at less than 5% loss of air in each cylinder (checks 95% good). This car will smoke...
1995 GMC C2500 Sierra SL 5.7L 1-2 shift VIN: 1GTGC29K0S
I have been working on this truck for the pass 4 weaks it has a 4l80e the problem I am having is that it gose into failsafe. It came to me from another shop thay put a new trans plug in it becouse the wires were shorting together. After thay did this the trans...
2000 Oldsmobile Silhouette GL 3.4L Mechanical VIN: 1GHDX03EXY
i have a 2000 silhouette with a 3.4 i would like to put a 3.1 if possible and am woundering if anyone has done this the customer has a wrecked car and wants to put the engine in his van none of our wrecking yards have been helpfull so if anyone knows i thank y...
1991 Pontiac Firebird Trans Am 5.7L MIL Lamp on VIN: 1G2FW33F6M
This vehicle sets code 45 while driving.Found scanning vehicle that integrator goes to 78 and o2 readings are high indicating rich mixture but dont know why.disconnected exhaust problem still present also O2 sensor replaced.Wondering about possible injectors.A... Trouble codes: 45 (Rich Exhaust)
1994 Pontiac Firebird 3.4L Cooling Systems VIN: 2G2FS22S6R
thanks before I even ask! This firebird came in overheating. done preliminary checks and then scanned watching it come up to temp the pcm temp reads lower than the gauge but not at beginning they and the iat were all with in 4 deg. but after 4 min. gauge temp ...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick LeSabre Custom 3.8L Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: 1G4HP52K9X
Guys, thanks again for all the help on this. Many great responses and many hit it right on. I found a broken valve spring on #6. I recheck compression and found a burst of compression and then I would loose it. I had already been there, found 75lbs of pressure...
1990 Chevrolet Corvette 5.7L Antenna Cable VIN: 1G1YY2387L
Thanks to everyone that replied. The ones that said it was above the shock tower behind the side panel was right. Al
1995 Chevrolet K1500 Silverado 6.5L my truck VIN: 2GCEK19SXS
So after a month of being with out my truck to day I got my block back. And I will be installing new rings,bearings ,waterpump, timing set, oil pump, crank sensor, new head shims and reseal everything. Thanks for all the input.
1996 Chevrolet K1500 4.3L No Start VIN: 2GCEK19W7T
Well, it works.I had looked over the wiring diagrams, and as far as I could tell, everything's the same between the 4.3 and the5.0. All the same part numbers,from the mass air sensor ,to the crank sensor. Wire was lengthened to the knock sensor, which is on th...
2002 Chevrolet Astro 4.3L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 1GCDL19X52
shimmed cranks sensor got to run test drive engine has noise and low oil pressure found out had different cluster installed almost 300000 miles drain oil a bunch of metal getting price on motor thanks guys Trouble codes: P0335 (Ckp a circuit problem), P0341 (Cmp sensor circuit out of range).
2005 Chevrolet Silverado 3500 6.6L No Start, Poor Idle Quality, Cuts out, Stall, MIL Lamp on VIN: 1GCHK33285
This was a tough one... 5V supply feed circuit on connector C7 was damaged due to resting on metal bracket. It was a VERY tiny pin hole and wire would only occationally rest against bracket and short out. This was what made this problem so difficult to diag... Trouble codes: P0642 (5v reference signal 1 low).
2006 Chevrolet Equinox LT 3.4L Abs VIN: 2CNDL73F36
The problem indeed was the wheel bearing sensor, as soon as I replaced rear ones the problem was solve.
2006 Chevrolet Express 2500 4.8L backup lamp VIN: 1GCGG25V46
once again thanks to all. after reviewing responses i was forced to go back once again to double check on all wires. the fix to this one was a short in the cargo lite (inside the fixture). that interior cargo lite is hooked up from the factory on that same ...
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