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Prev Professional Automotive Repair Technical Discussions for February 14, 2014
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Open Help Requests for GM
Help Request Answers
1996 Chevrolet Tahoe LS 5.7L Low Pedal VIN: 1GNEK13R9T
My problem is a low brake pedal/spongy pedal after doing basic brake repairs. Truck came in with a good pedal. Upon inspection needed front pads and rear shoes. Machined rotors and drums and replace rear brake hardware. Never even opened a brake line. Now the ...
2002 Chevrolet Impala LS 3.8L Low Beams VIN: 2G1WH55K32
One day as i left home the low beam headlights would not turn on. All other lights work including the high beams, blinkers,tail lights. i checked all fuses, relays,and the circuit breaker. i checked all the wires in the harness by the main connectors inside th...
2004 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, Surge, with a/c compressor VIN: 1GNDT13S94
vehicle exhibits an extreme increase in rpm when a/c compressor is commanded on. the a/c system seems to operate normal and pressures are within normal operating range. we checked the tac throttle to see if it was dirty. uh oh, somebody has already cleaned i...
2004 Chevrolet Silverado 2500 HD 6.6L Hesitation, Misfire VIN: 1GCHK23264
Truck has a tip in throttle hesitation. Basically it idles good great awesome does not skip a beat. Runs well at wot and/or just gettin it... not pussy footing around!. Seems to bobble a bit during light acceleration not to bad but will run bad and smoke like ...
2006 Chevrolet Tahoe Z71 5.3L stability control VIN: 1GNEK13TX6
this 06 Tahoe has a strange traction control issue. when I move from a complete stop and turn the wheel left or right I get a pump activation noise. no abs pedal drop ever. wheel speeds all seem correct. does not activate with traction control shut off. this v...
2006 Chevrolet Aveo LS 1.6L MIL Lamp on VIN: KL1TD66626
egr percent reading at idle or key on engine off always sits at 16%.does not change until i get to 40% on scan tool,then goes to around 32%.idle drops and gets rough.i cleared codes twice,disconnected batt.touched cables together with no change.thank you in ad... Trouble codes: P1404 (Egr sensor)
2002 GMC Safari SLE 4.3L Serpentine Belt VIN: 1GKEL19X42
Customer brought vehicle to me 01/02/14, with 256,387 miles and stated power steering pump was leaking and belt was noisy(he advised me of the history at that time) He believed leak was getting on belt causing noise, we confirmed p/s leak and getting on belt a...

Fixes & Summaries for GM
Fix/Summary Answers
1995 AM General Hummer 5.7L tire air light on VIN: 137DA8434S
Not knowing anything about this system, I was hoping for some replies with more basic information. I found a theory and diagnostic TSB on Identifix which helped. It had air line diagrams and wiring diagrams & diagnosis . I found the wheel valves were disco...
2006 Chevrolet Silverado 1500 LT 5.3L brake feel VIN: 2GCEK13T66
hey thanks guys for the info, I never heard abut 3MPH being normal, and since I have only seen it on 4 vehicles in my long career of doing this it did seem odd to me. The vehicle is a Z71 (to answer the one question) and the problem only did it once, and the o...
2008 Chevrolet Silverado 1500 WT 5.3L evap monitor VIN: 2GCEC13068
Thanks evryone for your imput all of them were helpful I had to run the test on a cold start like some suggested. Im gona make notes of the other tips and suggestions. I really appreciate yall clearing my doubts
2007 GMC Sierra 3500 HD SLE 6.6L Stall VIN: 1GDJK34677
Customer has this vehicle back for a week and reports that all is ok so I'm going to call it fixed. With not much to go on (how long can you stand by an idling vehicle)we tried an ignition switch to no avail. long story short a new engine controller seems to h...
1989 Pontiac Bonneville LE 3.8L Tail Lamps/bypass headlamp module VIN: 1G2HX54C1K
Hi All 3 great replies with help getting schematic/info but all were the same as i had ... the mitchell/alldata were incomplete incorrect and vague as were the schematic sent to me .. older cars less info .. oh well .. i jumped in and trial and errord it ....
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