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Prev Professional Automotive Repair Technical Discussions for September 10, 2005
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1994 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP52L6R
Vehicle was towed in for a no start problem. I have checked waveforms for cmp, ckp, and icm signals all test good. I also checked to make sure wires L and M have ground, N is 10V, and P is battery voltage. Any help I can get will be greatly appreciated. Thank ...
2002 Buick Century Limited 3.1L Magnasteer VIN: 2G4WY55J02
Hello, I have this Century with Magnasteer Variable Assist Steering (VES). At low speeds, the steering is erractically over-assisted or normal. The ABS and Brake lights come on sometimes when this occurs. Current code was c1241 - VES circuit malfunction Hist...
1994 Chevrolet Astro CL 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1GNEL19W5R
this post is for a friend of mine and it is his wifes car. this car was running rough and now it bearly runs. when you go just off idle car stumbles boggs real bad and then if you hold it floored it will semi over come and will run like it is missing. there is...
2003 Chevrolet Express 3500 6.0L A/C Belt Tensioner VIN: 1GBJG31U63
This tensioner for the A/C belt is bottoming out making a terrible noise on decel. We replaced both last week because the tensioner had an obvious gouge in it from where it had been bottoming out. Shipped van, everything was great, A/C pressures looked okay an...
1996 Geo Metro LSi 1.3L no power VIN: 2C1MR5297T
the car lacks power. i have checked everything possble i can think. i advance the timing to 12-14 degress has more power but still not like it should. replaced fuel filter;has good fuel pressure;no computer codes; have checked timing marks on gears; exhaust ba...
1998 GMC Yukon SLE 5.7L Hesitation, Cuts out, Misfire, bucks and backfires VIN: 1GKEK13R6W
Customer brought this in for when he accelerates from a stop it falls on its face and if you keep holding it to the floor it will pop,pop,pop,sounds like from air cleaner.Before it came to us he put in a new TPS,new ac sparkplugs,and even tried a used mass air...
1999 GMC Sierra 1500 SL 5.3L No Start VIN: 1GTEK19T7X
this truck has a intermittent no start security lockout.the computer is turning off the fuel injectors because it thinks the pass code is incorrect. the key lock cylinder is original.this is the 3rd GM vehichle to come to my shop with this pass code or pass lo... Trouble codes: P1631
2000 Oldsmobile Bravada 4.3L Misfire VIN: 1GHDT13W4Y
Vehicle came in with a intermittent misfire under loead and when cruising. Tuned it up and cleaned injectors. Added cleaner to the tank and returned to customer. Came back one week later, never having improved. We test drove with the scanner hooked up and watc...
1994 Pontiac Grand Am SE 2.3L No Start, Poor Idle Quality VIN: 1G2NE5535R
vehicle has extended cranking, will start once it picks up oil pressure and run but the idle flucuates. it will never stall but if you turn the ignition off once it warms up then it cranks but won't start. it then will have no rpm reading, no injector pulse, n... Trouble codes: 35 (idle speed error), 65 (injector circut fault)
2000 Pontiac Grand Am SE 3.4L Misfire VIN: 1G2NF52E51
PLEASE HELP ALL YOU GM TECHS... I'm looking at this Pontiac Grand AM for a friend and I've been out of the GM loop of quirks and giggles for the last 5 years. Anyway. It set a code PO300B in history for a cylinder misfire. Monitoring misfire status with my Gen... Trouble codes: P300
2001 Pontiac Firebird Formula 5.7L headlamp motor VIN: 2G2FV22G71
This car came in with a verified problem that the headlight doors open and close whenever the power door locks are triggered open or closed with the remote transmitter.Any information would be greatly appreciated. Thanks in Advance

Fixes & Summaries for GM
Fix/Summary Answers
1985 Chevrolet Camaro Berlinetta 5.0L Excessive Emissions, Poor Idle Quality, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy VIN: 1G1FP87E9F
well guys this was one of those cars you just had to take apart and look at one day at a time...after pulling my hair out ..and replaceing a few good parts..the problem was an after market alarm system half way installed...finding my way into the wiring harnes...
1992 Chevrolet K1500 Cheyenne 5.7L Ping VIN: 1GCEK14Z2N
Hello Thank you evertone for your replies. It seems as though there is no silver bullet. We havn't found a more sensative EGR valve or a more tolerant PROM, so for now we will just settle for the reduced base timing. The ESC is working fine, We beleive that ...
2000 Chevrolet Cavalier Z24 2.4L Poor Idle Quality, High Idle Speed VIN: 1G1JF12T1Y
I received several replies, most pertained to system grounds and wiring concerns. I have found that when the vehicle is in the failed condition(high idle speed) ltft goes to -15 with stft switching between +5 & -5, with a TP% of 4 (with the same 0.53v TPS volt...
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