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Prev Professional Automotive Repair Technical Discussions for June 9, 2011
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Open Help Requests for GM
Help Request Answers
1997 Buick LeSabre Custom 3.8L High Side Pressure VIN: 1G4HP52KVH
We have replaced entire A/C system because vehicle came in with pressure 30 psi low side and 350 high side. oriface tube pulled and had a few metal shavings, compressor was 14 years old, so we sold the system. after recharging system to spec, same exact differ...
1997 Buick Park Avenue Ultra 3.8L pwr doorlock/windows/mirror VIN: 1G4CW52K1V
pwr window mirror lock all went out at same time radio does shut off when door is open
1990 Cadillac Seville 4.5L booster VIN: 1G6KS5339L
This caddy has that tevis abs sytem. So it does'nt have that traditional vacuum booster. It has an electric motor with accumulator. The customer had no power assist. The motor fuse was burnt. I replaced fuse and checked power to the motor had power going to th...
2004 Cadillac SRX 4.6L fuel guage VIN: 1GYEE63A14
the vehicle would run out of gas and guage reads above 1/4. i replaced the fuel pump assembly problem still happens refered to dealer to reprogram ecm same problem. i removed the tank again removed both sending units i can set them both to empty the guage stil...
2005 Cadillac STS 3.6L starter VIN: 1G6DW67775
Have a frustrating concern here fellas, Vehicle towed into shop. Battery completely dead, customer states has been getting "no fob detected" message and when this happens vehicle will not start. I installed new battery and all was ok till finally "service air...
2006 Cadillac SRX 3.6L Starting VIN: 1GYEE63726
We started with key problem and replaced the ignition housing assembly, lock cylinder and theft antena ring. Vehicle still will not start 9or crank. Have done the key relearn many times - anti theft light will not blink. When turning the key all lights will go...
1993 Chevrolet Camaro 3.4L No Start, Misfire VIN: 2G1FP22SXP
Lots of info here and a lot of parts replaced. Customer started car in the morning and it ran great. He got to his destination and when he tried to restart the car it wouldn't start. It was then towed to our shop. The car started for us but ran poorly. We went...
1997 Chevrolet C3500HD 7.4L Steering&Braking VIN: 1GBKC34J2V
OK,Guys this one has me pulling my hair out,this is an AT&T truck,since november of last year this thing is killing p/st.pumps,2 new delco,now have reman on it and it has not made it out of the shop,what's going on is it makes real fine air bubbles and the pre...
1998 Chevrolet Malibu 2.4L Misfire VIN: 1G1ND52T4W
Hello Fellow techs, i have a headache on my hands. Vehicle came in running rough and missfiring on cylinders 1 and 3 my first thought was coil tower so i replaced it, still doing it then i thought coils so i replaced coils and, still missfires so i went a litt... Trouble codes: P0300
2006 Chevrolet Silverado 1500 LS 4.8L Compressor VIN: 2GCEC13V26
Vehicle came in for an A/C service, after performing an evac & charge we noticed the compressor not engaging. checked fuses and relays, all good. jumped relay to ensure smooth compressor operation, compressor is working fine. Used the scan tool to manually tu...
1992 GMC C2500 Sierra SLE 5.7L radio VIN: 2GTFC29K6N
I have this truck with a radio that stays on 1 o'clock and will turn off and on, I can push all buttons but nothing happens. I have heard this is a issue with these trucks. I get no sound. even the cassette deck which is in the dash alone doesn't work. Fuse o....

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick LeSabre Custom 3.8L Vents VIN: 1G4HR54K7Y
Went Back In And Found That two of the acutor plugs were swaped so swape them and did coumputer update all is good thanks for your help
1999 Chevrolet Venture 3.4L Poor Idle Quality, Surge VIN: 1GNDXO3E9D
Thanks for all the help.The egr was the culprit. They say a tech is only as good as his experience, this proved true here. I never knew these EGRs were reversable. Apparently neither did the shop who installed it. We installed it correctly and she runs good,fu...
2001 Chevrolet Monte Carlo SS 3.8L No Start, Theft VIN: 2G1WX15K61
Monte Carlo BCM was bad, dealer installed new one and flashed it and all the problems have gone away. Not sure what went bad internally but intermittant problem solved, thanks for all the help. Wiggie
2001 Chevrolet W3500 Tiltmaster W3S042 5.7L Abs Light On - No Codes VIN: 4KBB4B1RX1
This truck is basically an Isuzu NPR with the 5.7L Chev engine and auto trans. The Tech 2 is the factory scan tool for the drivetrain and even though it does access ABS data and some codes, there is a diagnostic connector on the driver's side kick panel (below...
2001 Chevrolet Silverado 3500 6.6L No Start, no injector pulse VIN: 1GDJK34171
Vehicle is still a no start, haven't worked on it in two weeks and not sure when we will get back to it. Thanks for the replies. I had already done what many of the replies had suggested and most of the information was already in my post. If I come up with a f... Trouble codes: P0380 (Glow plug circuit), P0540 (Intake air heater circuit), U1000 (Class 2 communication fault).
2002 Chevrolet C7500 8.1L Engine VIN: 1GBM7HIE62
Brand new motor delivered to shop with Head gaskets Installed Backwards, Gotta Love It... GM headgaskets have 2 tabs that should be visible at FRONT of block. Tabs were at REAR of block. Gaskets have water ports on one end only, therefore the ports on block an...
2002 Chevrolet Venture LS 3.4L 5v map and tps VIN: 1GNDX03E82
thanks for the replies. they were fairly general advice for the most part. what i found was the harness to the pcm went past the upper radiator hose clamp. the clamp was installed in such a way that it chaffed a few wires in the harness. what caused the symp... Trouble codes: P1106 (Map hi v), P1635 (5v ref), P1860 (Tcc pwm ckt).
2003 Chevrolet S10 4.3L Poor Idle Quality, Hesitation VIN: 1GCDT13X73
Thanks for all the good ideas. There was a TSB that talked about a reflash to the PCM, it specifically states that the PCM retards the timing excessively at high ambient temps. The fix was to reflash the computer. (We must have missed this when we looked at th... Trouble codes: P0300 (Random Misfire).
2003 Chevrolet Trailblazer LT 4.2L MIL Lamp on VIN: IGNDS13S43
I'm always amazed that you guys would give up some of your valuable time and give such great advise, thanks to all of you. I believe I have this one fixed. Some of you said to closely look at the electric fan clutch, others mentioned the thermostat and coolant... Trouble codes: P0128.
2004 Chevrolet C5500 Kodiak C5U042 6.6L can only go 30mph VIN: 1GBE5C1114
THe fix was to program the rear ratio as well as tire rev per mile in the ECM. It is listed under special functions and speedometer calibration in the PCM data menu. With the help of the local GM dealer and the VIN we programmed it and it seems to work. One th...
2005 Chevrolet Silverado 2500 HD 6.6L Excessive Emissions, Misfire VIN: 1GCHK23265
I ended uppulling the passanger side injectors as this seems to be the only side of the engine that is destroying injectors. I used our solice to kill injectors and number 3 injector took most of the smoke away. this was the same injector that had gone bad two...
2008 Chevrolet HHR LT Panel 2.4L No Start VIN: 3GNDA13D78
I sent this one to the dealer. They replaced the Theft Deterrent Module and attempted to flash it. After several calls to the General and someone there writing some software they finally got it to flash. They then did the relearn and it now starts and runs. Th... Trouble codes: B3055 (b3935-), B3935.
2009 Chevrolet Traverse LS 3.6L Mechanical VIN: 1GNER13D39
Thank you to all who replied, the info that David sent was especially helpfull in diagnostics. The timing of the cams was way out, I see no reason that this was a direct result of the oil change at a jiffylube, looks like a coincedence. The valves had lightly...
2006 Hummer H3 3.5L Tpms VIN: 5GTDN13646
This vehicle would go into relearn and relearn 3 sensors correctly, when the last one relearned it shut down and flashed service TPMS. Replaced BCM, no change. 4 new sensors made no difference, did not install them just learned them from inside the vehicle. Hu...
2002 Oldsmobile Intrigue GL 3.5L air conditioner VIN: 1G3WS52H62
2005 Pontiac Aztek 3.4L shift lever VIN: 3G7DA03E85
Well most of you guys were right on this Aztek. I could not always move the shift lever. I removed the center counsel and checked the wires like most said, you couldn't tell by looking that they were broken but if I wiggled them then i could move the lever. Re...
2006 Saturn Ion-3 2.4L Starter VIN: 1G8AL58B06
This Isn't Fixed Yet. Customer Complained To The People (Used Car Dealer) They Bought It From And They Decided It Needed To Go To "Their" Mechanic. I Know This Mechanic And When He Has Fixed It I Will Post That Fix. Thanks For The Help.
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