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Prev Professional Automotive Repair Technical Discussions for December 18, 2012
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Open Help Requests for GM
Help Request Answers
1996 Chevrolet C2500 Silverado 6.5L No Start, MIL Lamp on
hey guys working on my personal pickup here, started acting up a couple of weeks ago with an intermittent no start always when warmed up. shortly after that i got a po231 code low lift pump feed back voltage. so i replaced the lift pump as it was old anyway, a... Trouble codes: P0231
2002 Chevrolet Trailblazer LS 4.2L valve train VIN: 1GNDS13SX2
Car came from body shop where had been sitting for 4-5 months.It may have had this problem before,because he bought it at sale and did body repairs,started it and misfire on 2-4 and ocassional 6.When pulled valve cover found rockers for 2-4-6 on intake side on...
2002 Chevrolet Silverado 1500 4.3L Abs VIN: 1GCEK14W22
Vehile came in with rusted and leaking brake lines from ABS control unit/valve block to front and rear wheels.i replaced lines and bled system.Road tested vehicle to reveal another problem with ABS activation right before coming to a complete stop. I scanned v...
2003 Chevrolet Silverado 2500 HD 6.6L exhaust VIN: 1GCHK29103
vehicle is a close friend of mine,and he noticed as did i that at idle every now and again exhaust will show a light blue smoke.not all the time.while coasting to a stop (again not all the time)then after the stop with a light to moderate take off the smoke wi...
2006 Chevrolet Impala LT 3.5L converter VIN: 2G1WT58K56
This car runs and shifts fine except for the torque converter continuously locking and unlocking approx every 5-10 seconds while cruising.
2008 Chevrolet Silverado 1500 LT 5.3L Fuel Pump VIN: 1GCEC14J08
Thanks in advance. I have an 08 silverado in with a 5.3 L. Customer says it just died while driving. I have tested the fuel pump and when I give it power it runs. Tracked wire to find an fscm. I have battery voltage coming in to it but nothing coming out. I ev...
2003 GMC Envoy SLT 4.2L reduced engine power VIN: 1GKDT13S13
The P1271 blues: this vehicle has a history of setting P1271. Itís very intermittent and I have yet to duplicate it. By the time it arrives at the shop the sensors are working normally and the repair is to cycle the ignition key off and back on the get the red... Trouble codes: P1271
2002 Oldsmobile Intrigue GL 3.5L MIL Lamp on
Vehicle has a new air pump on it. Air pump works when controlled with the scanner. Pumps plenty of air. I have checked for vacuum at each of the 2 check valves while the pump is running. No vacuum found at either valve. I did this by leaving one valve connecte... Trouble codes: P0410
2003 Saturn Vue 3.0L steering/ suspension VIN: 5GZCZ53B03
This vehicle came in for a bumper to bumper inspection and an oil change. As a result of the inspection, we replaced the sway bar end links and did a transmission flush. We recommended front brakes due to a vibration in the steering while braking at freeway sp...

Fixes & Summaries for GM
Fix/Summary Answers
1987 Buick grand nation 3.8L Poor Idle Quality, Hesitation, Stall VIN: 1G4GJ1176H
Thanks for all the input guys. The camshaft synchronizer was off 2 teeth. I believe it was John from New York who put me on to Casper Electronics. They give very detailed instructions on where everything should line up. After getting that correct it was much b...
2007 Cadillac STS 3.6L Programming ECM VIN: 1G6DW67777
As I said, I sent this vehicle to the dealer because of time constraints. After reading the replies, I believe the general concensus is to hold the on button for 10-15 seconds to get the ecm into koeo mode. I had tried to program it in the acc mode and the ec...
2004 Chevrolet Silverado 3500 6.6L lost of power VIN: 1GCJK39114
Thanks for all the information you guy provide would not have been able to solve the problem with out y'all and a picture from archive to show me what a needle in a hay stack I was looking for. It was small hole in LT. GRN. BLK command wire for inj. 3 where it... Trouble codes: P0202 (cyl.2-injector circuit promblem), P0203, P0205, P0208, P0208, P2149 (Inj. Position voltage control curcuit Group 2).
2007 Chevrolet Trailblazer LT 4.2L starting VIN: 1GNDT13S97
well here it goes, after probing all the wires leading to and from the ignition switch I stopped and read the wireing diagrams in depth and traced most of them. then i looked closer at what fuses were with what wire. the ign2 30 amp j-fuse in the box under the...
1990 Pontiac Grand Prix LE 3.1L Hesitation, Stall VIN: 1G2WJ14T1L
Ran some injector cleaner through it and the problem went away. Thanks for the help.
1995 Pontiac Firebird Formula 5.7L No Start VIN: 2G2FV22P9S
Thanks to all who responded. I'm still waiting for the customer to return. I scoped the ignition and the High Res is good but the Low Res is very inconsistant so I'm sure it's a bad Dist from Autozone. I warned the customer before I installed it that he would ...
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