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Prev Professional Automotive Repair Technical Discussions for May 26, 2010
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Open Help Requests for GM
Help Request Answers
2002 Cadillac DeVille 4.6L Unknown VIN: 1G6KD54Y62
Owner complaining that the A/C will not always hold a consistent temperature. Climate control may be set for 65 and may cool to that for a while, then changes to warm air on its own. I am unaware whether a scanner will help to diagnose. I suspect the HVAC Cont...
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1988 Chevrolet C1500 Cheyenne 4.3L abs VIN: 1GCDC14ZXJ
customer come back 3 days later with abs light on pulled code 4 grounded abs valve switch found defective isolation/dump valve replaced with new one light not on but feel like truck going into abs mode when coming to a stop has anybody see this problem before
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1994 Chevrolet K1500 Silverado 5.0L Excessive Emissions, Poor Idle Quality, Surge VIN: 2GCEK19H3R
Hello all. This truck is driving me kind of crazy at this point. It came in with a idle surge and stalling problem. The timing was way off, once that was set correctly it stopped stalling but the idle still surges. We tried a new IAC valve and tune-up with a c...
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1995 Chevrolet Camaro Z28 5.7L No Start VIN: 2G1FP22P2S
Car came in as a no start. Was fuel fouled. Had no wires going to the coolant sensor. Installed new coolant sensor and pigtail. Coolant sensor now reads through scan tool. cleared the codes and pulled plugs to dry out cylinders. Installed new delco spark plugs...
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2002 Chevrolet Impala 3.8L MIL Lamp on VIN: 2G1WH55K52
Vehicle came in with no power. Diagnosed plugged cat. Customer had cat replaced at muffler shop(aftermarket cat) vehicle came back 2 days later mil light on. Dtcs 171 1811. Scan data showed 02 sensors low mvs at idle in closed loop. Voltage at 43mv and not flu... Trouble codes: P0171 (Lean), 1811 (Trans)
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2004 Chevrolet Silverado 1500 Z71 5.3L MIL Lamp on VIN: 2GCEK13TX4
throttle body has been replaced with a new part. throttle body connector has been replaced. pcm has been flashed with new updates. vehicle still intermittenly has a ses light and reduced engine power light that comes on and vehicle seems to be in limp mode. ov...
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2004 Chevrolet Suburban 1500 LS 5.3L fuel in cannister VIN: 3GNFK16TX4
vehicle arrived with a po455 and cannister filled with fuel. replaced with new cannsiter and vent valve. vehicle left without incident for two days... can a weak purge valve cause this problem? tested fine in the bays. any help would be greatly appreciated... Trouble codes: P0455
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2007 Chevrolet Cobalt LT 2.2L MIL Lamp on VIN: 1G1AL55F27
I have an 07 Cobalt and intermittently while driving down the road the odometer and speedometer bounce back and forth, along with all the warning lights coming on. The steering also becomes very hard. The car does not die. Then I pull over the car, turn if off... Trouble codes: P0575 (p0700-), P0700 (u0073-), U0073 (u0121-), U0121
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2000 GMC Sonoma SLS 4.3L Oil leak VIN: 1GTCT19W6Y
This GMC is cursed! Finally fixed a misfire and now it's started leaking oil. Start over, engine replace by another shop, came to me to fix misfire they couldn't figure out. Shimmed crank sensor and fixed misfire. Now customer is back with a oil leak, appears ...
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2002 Oldsmobile Alero GL 2.2L injector pulse VIN: 1G3NK52F82
with scan tool installed readings look good but after trying to start ignition turned off ,then on, readings are out to lunch iat -40 ect-40 engine load 0%. When readings good iat ambiant temperature ect ambiant temperature engine load 100%. I suspect pcm but ...
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1998 Pontiac Grand Am SE 2.4L No Start VIN: 1G2NE52T1W
Help! We have thrown everything at this one. The theft light stays on solid. Only code is B1014. Installed a new ignition lock cylinder and instrument cluster. The theft light flashed so we attempted the relearn procedure. After 12 minutes or so, the theft lig... Trouble codes: B1014 (R code unprogrammed)
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2006 Pontiac Torrent 3.4L Steering wheel VIN: 2CKDL73F76
Vehicle came in last week for brake pulsation, we repaired brakes. Vehicle returned THIS week with a shimmy felt in the steering when applying the brakes. You can actually feel and see the steering wheel shimmy left and right. All brake parts were reinspected ...
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2004 Saturn Vue 2.2L MIL Lamp on VIN: 5GZCZ23D54
In for emission test, had mil illuminated code P0378 can't find much info on this code. Trouble codes: P0378 (Timing reference high resolutionsignal B intermittant/eratic pulse)
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Fixes & Summaries for GM
Fix/Summary Answers
2005 Buick Terraza CXL 3.5L Mechanical VIN: 56ADV33LZ5
Well here is the great information on the a/c lines, one there is a tool on the market the looks like a dealer only, its a j-41425, the next part of this is that you could buy the fitting and the tool from a company called American Loking of Florida, number 1 ...
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1990 Cadillac Fleetwood 4.5L Unknown VIN: 1G6CB533XL
Thank you very much for the help. I believe that through my research and your responses that the accumulator was the problem, however, the customer declined the repairs due to the expense and age of the car. All is not lost, I did learn a lot about this system...
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1991 Chevrolet Camaro Z28 5.7L Excessive Emissions, Poor Idle Quality VIN: 1G1FP33F2M
THANX TO EVERYBODYS HELP,IT WAS IMMENSELY USEFULL.WHAT I FOUND WAS THE WIRING WAS BACKWARD FOR THE SENSOR.AFTER CHECKING THE COLOR CODE FOR THE TPS SENSOR,THE WIRING WAS CORRECT,BUT I CUT THEM AND REVERSED POLARITY,AND SURE ENUFF IT PROCEEDED TO FUNCTION NORMA...
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2001 Chevrolet Silverado 2500 HD LS 6.6L MIL Lamp on VIN: 1GCHK23171
Replaced glow plug controller and problem is gone. Thanks for the replies. When I was troubleshooting it with alldata some of the information didn't seem right, had another duramax in shop and comparison check on it, led me to the controller. Thanks again Trouble codes: P0380.
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2005 Chevrolet W3500 Tiltmaster W3S042 5.2L Surge, Cuts out, Stall, Poor Fuel Economy, MIL Lamp on VIN: Y8BE5B1656
Joe from Calif. Suggested checking the SCV terminal. Pull it off, check for corrosion. Ensure the terminal fit is tight when installed. If not, tweak it so the fit is tight. Prior to re-installing, insert a dab of dielectric grease to prevent future corrosion.... Trouble codes: P0087, P0091, P0093.
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2008 Chevrolet Silverado 1500 WT 4.3L MIL Lamp on, Temp gage drops out VIN: 1GCEC14X28
This one is fixed! We removed the thermostat and it had some corrosion on it. It was definatly sticking open causing all the symtoms. We replaced the thermostat with a Delco and all is well!The only thing that threw us off is the temp gauge showing cold instan... Trouble codes: P0128.
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