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Prev Professional Automotive Repair Technical Discussions for January 17, 2006
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Open Help Requests for GM
Help Request Answers
1987 Buick Electra Park Avenue 3.8L Excessive Emissions, Cuts out, Misfire VIN: 1G4CW5132H
2002 Cadillac Eldorado ETC 4.6L Relearn VIN: 1G6ET12972
Replacing crankshaft sensors A and B for stalling and intermittent DTC. SmAllData said after replacing sensors to do a System Variation Learn Procedure? I cannot find it in THE REDBRICK. Do you have to? Other tech request for A&B sensors do not say a word abou...
1996 Chevrolet Blazer 4.3L Poor Idle Quality, Hesitation, MIL Lamp on VIN: 1GNDT13W8T
I am not sure where to go next on this one. It has a rough idle and doesn't seem to have full power when driving. It has 3 DTC's, the freeze frame was: FSS O2O2, CLV 5.1%, ECT 205deg, STFT1 -5.5%, LTFT1 -18%, STFT2 -7%, LTFT2 -18%, MAP 11.81in, RPM 1189, VS 24... Trouble codes: P0172, P0175, P1441
1997 Chevrolet Corvette 5.7L No Start VIN: 1G1YY22G4V
Hello fellow techs, Thanks in advance for any help with this problem child. Vehicle towed in after customer replaced battery with a crank no start. Fuel pressure ok, cam and crank signal good, codes P0601 and P1518 stored in history and current. Other codes in... Trouble codes: P0601 (Internal control module memory check sum), P1518 (PCM to TAC module serial data)
1998 Chevrolet Express 2500 LS 5.7L converter VIN: 1GCGG25R5W
when this trans shifts out of lock up it will shudder at times.feels like you are going over rubble strips before a stop sign.customer says under right conditions like a long grade it will last longer.fluid was flushed 10k ago and dealer replaced pressure cont...
1998 Chevrolet Blazer 4.3L hard start VIN: 1GNDT13W6W
fellow techs,this one came in for a hard to start cold first start of the day.would puff lots of black smoke when it did start...checked fuel pressure.would come up to 65 psi then drop to 0.sometimes it would hold pressure at different pressues.ie: 30 psi one ...
1999 Chevrolet Tracker 2.0L acuator VIN: 2CNBJ18C9X
Hello. I have this tracker with a four wheel drive problem. When four wheel drive is engaged a little air pump builds vacuum like it is supposed to but the pressure keeps bleeding off inside the diff. This causes the 4wd light to flash. I was going to take it ...
1999 Chevrolet Lumina 3.1L No Start VIN: 1G1WL52M8X
This car sometimes will not start, the security light stays on, it won't crank. If I jump the starter it runs for 4 sec. then shuts off, the security light is on steady. I checked the key resistance at the theft module, tried another good key, and replaced the...
2002 Chevrolet Trailblazer LS 4.2L transfer case VIN: 1GNDT13S12
Hello all. I am working on a trailblazer that on occasion will not shift from where ever the 4wd selector switch is positioned. Generally after sitting for a while after the 4wd was used on the previous trip. When you start the vehicle the 4wd selector will f...
2003 Chevrolet Impala 3.4L Radio VIN: 2G1WF52E13
Radio has no sound. Radio powers up and looks like working, tried a CD and the track counter goes but no sound. It acts like the Amp doesn't wake up. A body shop brought this veh to me, it was back halved. Radio and amp in trunk have pwrs and grds. Substituted...
2004 Chevrolet Express 2500 4.8L flywheel,bolts/flange VIN: 1GCGG25V71
van is in a friends shop.original complaint was noise in engine.found flywheel cracked and damaged.ordered replacement from dealer with no mention of new bolts or companion flange required.old flywheel had ferrels in bolt holes to fill gap between bolt and fly...
2004 GMC w5500 6.5L Parking lights VIN: JKXW654X44
Looking for help with wiring Dig. This ig a G.M.C inport my MITCH only has G3500.
2003 Hummer H2 6.0L MIL Lamp on VIN: 5GRGN23U73
Hi Hummer Fans: This vehicle came in with intermittent mil light on, but off when it reached the shop. When mil light would be on, vehicle would go into reduced engine power mode and illumniate appropiate lamp. Vehicle would only run about 1500 rpms and limp a... Trouble codes: P0120 (throttle/pedal positioner/switch a circuit error), P0220 (throttle/pedal positioner/switch b circuit error), P1516 (tp sensors are invalid/pcm and tac cannot determine the throttle position.)
2002 Oldsmobile Alero GL 2.2L gauges VIN: 1G3NL52F62
car has no gauges and no warning lamps-except "check Engine" and illumination-dimmer does work, the indicator warning lamps activate with indicators-no high beam warning lamp. car starts-drives fine, radio operates. Snap on scanner cannot get into B.C.M. does ...
2002 Oldsmobile Bravada 4.2L Transfer Case VIN: 1GH0T13S62
The 4wd on this Olds will not engage. I am not very familiar with this system. Here again I am running into a problem communicating with the vehicle. I am using a Genisys System with 2003 software. Alldata says to try to communicate with theTCCM. If unable to ...
1997 Other GM P-30 6.5L Excessive Emissions, Misfire VIN: 1GBKP32Y5V
vechicle misfires and alot of white smoke while in the 1500rpm to 1800 rpm range with no load. excessive black smoke while driving 6.5 non turbo diesel engine
1995 Pontiac Grand Prix SE 3.1L rear rotors,calipers pads VIN: 1G2WJ52M2S
right rear caliper,rear pads and right rear rotor were replaced on 7-04 for pads being worn to metal at 85000 miles,then on 8-05 the pads were replaced again with the rotor being resurfaced,milage was 102000,now back again with right rear outer pad worn to met...
2000 Pontiac Sunfire SE 2.2L No Start, MIL Lamp on VIN: 1G2JB1248Y
customer complains high beams don't work and D.R.L. light flashes in drive, and when car is shut off and key out of ignition, check engine light will flash one time after aprox. 15 sec. and after car sits a awhile car will crank and won't start. I found shorte...
2000 Pontiac Bonneville SE 3.8L Stall VIN: 1G2HX54K8Y
Customer complaint of vehicle die after start up. It also wanted to died one time going down road. I have found that vehicle will start and when it wants to die will do it right after it starts. May do it 2 consecutive times in a row then it will run fine. Som... Trouble codes: P1626 (Theft Deterent System SIgnal)

Fixes & Summaries for GM
Fix/Summary Answers
1996 Cadillac DeVille 4.6L Electronic VIN: 1G6KD52Y8T
after going back over the car found leak a compressor replaced compressor and drier. will see if this makes a different. its been a couple of days so far
1996 Cadillac Fleetwood 5.7L pass key fault VIN: 1G6DW52P8T
great work jim christina and trent and a special thanks for the phone call offer, but it was not needed. i measured the value of the key with my ohm meter and when i checked the value at the wires in the orange tube-thing, i found the circuit to be open, conti...
1986 Chevrolet Corvette 5.7L Poor Idle Quality, Surge, Cuts out, Misfire, Poor Fuel Economy VIN: 1G1YY0783G
Fix was to replace the ECM with an AC Delco remaned unit. Found out GM had a lot of trouble with the 86 - 89 ECM's circuit board and gave up on it, turned it over to Delco to reman. A lot of reman units even from GM were junk. I will let ya'll know how long th... Trouble codes: 41 (incorrect prom cylinder select), 42 (esc), 43 (esc), 44 (lean).
1994 Chevrolet S10 Blazer Tahoe 4.3L abs VIN: 1GNDT13W6R
Thank you to all that helped. The fix on this one was a rear brake job including wheel cylinders. The problem was a sticky wheel cyl.I learnd once again check the basics first!
2000 Chevrolet Impala 3.4L lower intake manifolds VIN: 2G1F52E919
thank you guys i will look into the felpro or gm updated gaskets. the majority said this and i will have to agree. looks like the gasket i have been using are definatly not the updated ones, and i will try the new bolts and the right stuff sealer. i will let y...
2004 Chevrolet Silverado 2500 HD 6.6L mil light on VIN: 174F124704
Hello I received 3 replies. As far as the c0201 coded we found a tsb that sent us to a ground on the frame under the driver. We cleaned it and reassemble it. The code c0201 did not returen. As far as the c0550 when I did a vin search on the gm web site it came...
2000 Pontiac Montana 3.4L MIL Lamp on VIN: 1GMDX03E4Y
Thanks for all the advise everone, I took Steve's lead and looked for leaks at filler neck, was rusted but no visual hole in tubes. Used a hand held vacuum pump with 2 hoses, outlet into tank and put a cigarette in inlet side, sealed on to very edge of filler ... Trouble codes: P0440.
2002 Pontiac Grand Prix GT 3.8L Stall VIN: 1G2WP52K62
Sorry I was so long with reply but I wanted to make sure on the fix.Another relern on the key seems to have cured the problem. Thanks again to those that helped Cheers Don
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