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Prev Professional Automotive Repair Technical Discussions for September 15, 2011
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1997 Buick Park Avenue Ultra 3.8L Stall VIN: 1G4CU5210V
Today's patient is a high mileage supercharged Buick 3800. Customer came in last week with a complaint of eng stall. I did not get symptom but did have low/ unstable idle on decel w/ MIL (p0171 lean run)- AND +40% fueltrim @ idle. Found & replaced leaking gask... Trouble codes: U1255 (ABS module-class 2 comm fault), C1276 (ABS module- torque signal ckt fault), U1016 (BCM- lost comm with PCM), U1255 (ABS module-class 2 comm fault)
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2006 Buick Terraza CXL 3.5L chime VIN: 5GADX33LX6
Customer complaint was that at random times while driving it will beep at her. I road tested and sure enough occasionally it will chime loudly twice while driving. No lights come on and nothing comes on the info center. I hear there are lots of issues with the...
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2000 Cadillac Escalade 5.7L Unknown VIN: 1GYEK13R4Y
Information in previous box
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2000 Cadillac Escalade 5.7L Duct Temp VIN: 1GYEK13R4Y
Customer complained a/c was not cold enough originally. System seemed fine when checked, but was 1/2 lb. low on freon - not much. Charged the system and sent them on their way. Since then, the customer has been back numerous times with the same complaint.Escal...
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2000 Chevrolet Malibu 3.1L Horn circuit VIN: 1G1NE52J1Y
Horn works on certain turning position and most of the time inop. Fuses are good. Horn itself good. Removed horn cover on steering wheel. Found no juice at the steering wheel horn connection.. It has tilt steering. Also found no ground circuit at the steering ...
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2004 Chevrolet Colorado 3.5L No Start VIN: 1GCDT14674
iATN family. This is one of the GM vehicles that you can put the starter in crank mode and release the key. It'll keep cranking until it starts, if it starts. And I'm perplexed here. This truck has a number of symptoms, the first and perhaps most telling is if...
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2007 Chevrolet Colorado LS 2.9L No Start VIN: 1GCCS139X7
The vehicle will work perfectly fine for approximately a month then after a hot soak of about 2 min. The customer will try to start the car and the vehicle just cranks over. There are no dtc's and the vehicle has been towed him 3 times, every time it's towed i...
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1997 Geo Prizm 1.6L No Start VIN: 12JW833EUE
ok guys any help with this one will be greatly appreciated. this is my friends car and we are working on it at the house, so having said that i have limited access to scanner etc.. at home. ok this car is getting no spark and no injector pulse width, we instal...
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2005 GMC Sierra 2500 HD 6.6L Black smoke VIN: 1GTHK23295
Client brought in vehicle complaining of black smoke on accel. Confirmed black smoke with client and found it to smoke out a huge cloud of black smoke enough to blind and hide the vehicle next to me at a stop light. Started diagnosis with scanner hookup and ch...
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1990 Oldsmobile Cutlass Ciera 3.3L brakes VIN: 1G3AL54NOL
customer complained about low peddal and poor stoping ability,pads and shoes good condition and clean,no fluid contamination,lf caliper bleed screw broken off so we replaced that caliper.lr wheel cyl bleed screw rounded off so also replaced that wheel cyl.blee...
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2001 Oldsmobile Aurora 3.5L Stall VIN: 1G36R64H41
Hello, I have a very troublesome Aurora that intermittently will just stall like you shut the key off. if you catch it when it's about to happen and throttle it, it will stay running. It has a MAF code that keeps coming back even though has a good MAF sensor a... Trouble codes: P0101 (MAF sensor performance), P1106 (MAP Sensor voltage intermittently high)
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1995 Pontiac Firebird Trans Am 5.7L Misfire
ok guys i have a missfire on this car. i have good spark at every spark plug. i have 12 ohms resistance at every injector. i have power and ground to each injector. the maf numbers look good on the scope. fuel pressure is good. it had a tune up about 5000km ag...
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2004 Saturn Ion-3 2.2L Engine VIN: 1G8AW14F54
Vehicle came into shop with a engine knock. Seems to go away after sits and idles for a couple of minutes but really wraps while driving. No metal shavings in oil and no signs of internal damage with oil pan and valve cover removed...We don't have that much ex...
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Fixes & Summaries for GM
Fix/Summary Answers
2006 Buick Rainier CXL 4.2L Front drive wheels VIN: 5GADT13SX6
Thanks to all the helpful requests, especially Craig from Michigan. He hit the nail on the head, the transfer case encoder motor was seized in the full on position. The transfer case uses an electric motor to operate a lever which applies clutch pack in the ...
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1991 Cadillac DeVille 4.9L Excessive Emissions VIN: 1G6CD13BOM
well thanks very much guys i found injectors 5and 7 bad spray pattern passwed smog with 0 co 7 hc 12 nox amazing fuek atomization is crutial
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1999 Chevrolet Malibu LS 3.1L Coolant loss VIN: 1G1ND52M4X
Well I have to call this fixed. Had 3 guys hit it on the head with coolant reservoir bottle not sealing. (only piece of cooling system that was NOT replaced) Took a coffee cup full of water to prove it, (place vent tube in cup of water and look for bubbles whe...
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2009 Chevrolet Suburban 1500 LT 5.3L Compressor VIN: 1GNFK26309
Even though Tech2 showed good pressure and could get ac compressor to engage decided to place gauges on a/c. Found corroded a/c line that feeds rear line. Ordered new lines and intend to install, recharge and test.
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2001 GMC Sierra 2500 SL 6.0L Engine Ctrl VIN: 1GTGK29UX1
Thanks to all who replied. Replaced intake gaskets and truck has been working fine for two days. It acted like no other intake leak i have seen but it seems to have fixed it.
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2007 GMC Acadia SLT 3.6L No Front Blower Motor Operation VIN: 1GKER33747
THANKS FOR EVERYONES HELP. I BELEIVE I COMPLETLY CHECK ALL WIRING UP TO BLOWER MOTOR. THE VOTALGE DROP BETWEEN BLOWER MOTOR CONTROL PROCESSOR AND GROUND WAS .03 VOLTS. AFTER JUMPING THE WIRING HARNESS AT THE BLOWER MOTOR CONTROL PROCESSOR THE BLOWER MOTOR ...
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