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Prev Professional Automotive Repair Technical Discussions for April 23, 2012
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Open Help Requests for GM
Help Request Answers
1988 Cadillac Eldorado 4.5L compressor
hello techs i have this cadillac that i have to but a compressor on because it was blowing the ac fuse un plug the comprssor and the fues would stop blowing,it looks very hard to get to im thinking to take the radiator and the lower front motor mount off the f...
1990 Chevrolet Lumina APV 3.1L Poor Idle Quality, Hesitation, Surge VIN: 1GNCU06D3L
Started running rough, low power, found one injector not firing,tested with noid light, concluded defective injector. Replace both injectors, gaskets and pressure regulator. No change. Checked for codes, fuel pressure and misc tests. Concluded defective ecm. R...
1998 Chevrolet Corvette 5.7L no reverse,2nd,4th gears VIN: 1G1YY32G4W
the car came in running fine. I did a complete paint job, repaired LH window motor, AC blower motor, idler pullys and belts, etc. When I was finished and ready to deliver the car, I got the dreaded "service steering lock" warning on the ICP. while fixing fix t...
1999 Chevrolet K1500 Suburban 5.7L Compressor VIN: 3GNFK16R3X
Thanks for the help. I need another set of eyes on this. Suburban came in A/C inop, System was flat (empty). Customer stated "someone put 8 cans in, on my vacation to try and stop a leak". well i found o-ring gasket under combo hose to compressor blown out and...
2003 Chevrolet Silverado 2500 HD 6.0L no acceleration VIN: 1GCHK29U53
Very intermittent. Truck looses power while driving. Can put pedal to floor and does not accelerate. shut off for a few minutes and runs great till next time. could be as long as 2-3 months.Seems like throttle body issue, but have read many sites where techs r... Trouble codes: P220, P101, P134, P0171 (Lean bank 1), P0174 (Lean bank 2), P0300 (Random misfire)
2004 Chevrolet Trailblazer LS 4.2L cruise control VIN: 1GNDT13S34
Customer just bought vehicle. Cruise Control works properly until reaching 73-74 mph then shuts off automaticly, cruise indicator on Instrument panel goes off. If you keep the cruise acc. switch on multi function switch pressed as soon as speed hits 65 cruise ...
2004 Chevrolet Astro 4.3L Fast Idle VIN: 1GNDM19X84
Thank you for the help. This Astro will stay at a high idle at every stop. If you place it in neutral, it will drop to normal and be fine until the next stop. I didn't see anything similar in the database so I'm looking for some help. Thanks again.
2007 Chevrolet HHR LS 2.2L Misfire, MIL Lamp on, Low compression #3 VIN: 3GNDA13D67
I am wondering if this is a common problem with these vehicles, common causes, and common fixes. My guess is a problem valve. What insights have Chevy/GM techs have? Thanks! Trouble codes: P0303 (Misfire cylinder 3 detected)
2000 GMC Yukon Denali 5.7L keyless entry VIN: 1GKEK13RXY
I have a 2000 Denali that came in with the radio and power windows inop. When this happened there was no power to the fuse panel, traced to faulty bcm. Replaced module and fixed all of the concerns, windows, radio, interior lighting, etc. Problem is that I am ...
2003 GMC Yukon SLE 5.3L Sunroof VIN: 1GKEK13Z13
HI All. Vehicle came in for Mil on and Sunroof open not closing. When the switch is operated there is slight movement from the sunroof in both directions.Scan test BCM =B1440.B2958,B2961,U1000.Monitor Data for possible intermittent power mode lost.Could not du...
2004 GMC C7500 Topkick C7C042 7.2L Abs VIN: 1GDJ7C1C14
I am at a loss with this truck. Code C0272 will not clear. All others clear. I have followed the diagnostic steps that I found on the internet and they led me to replace the EBCM module which has made no difference. I have no power to the relay that runs the b...
2000 Oldsmobile Alero GL 3.4L cooling fan VIN: 1G3NL52E4Y
I let car warm up to 225 degrees looking at modis snapon scanner,at this degree water started pushing out of overflow tank, fans would not come on. If I try to work fans with modis scanner under functional test the low speed fans will come on when I command th...
2008 Other GM Diesel engine 4.7L Excessive Emissions VIN: 5B4KPD2548
vehicle will not regen cat at a stationary stop. the vehicle will regen when driven on highway. this vehicle is a fedex delivery truck which rarely goes on highway. we need a vehicle wiring diagram for the glow plug ckt. and any related testing procedures of t...

Fixes & Summaries for GM
Fix/Summary Answers
1985 Chevrolet C10 Silverado 5.7L starter
Found that owner had installed a later model flex plate which did not align with starter, installed flex plate from 83 chevy fixed problem
1996 Chevrolet C1500 4.3L Misfire
well thanks guys for your help after reading Henry from vermont's reply about the o2 sensor connectors being crossed I went straight to the o2 sensors and switched the connector from bank one to bank two and bank two to bank one. And just like that the truck s...
2006 Chevrolet C4500 Kodiak C4U042 6.6L No Start VIN: 1GDE4C1296
ok so we are pulling heads for inspection and replace head gaskets. i suspect that what i see in radiator is combustion crud. i dont know if inj have sleeves or not. dealer says no but post say yes. truck has been torn down some and put back together by seller... Trouble codes: P0097, P0230, P0463.
1998 GMC K1500 Sierra SL 5.7L No Start VIN: 2GTEK19R8W
Thanks for all the help. Removed injector unit and applied a fuel source and cranked it up to 125 psi, pulsed injectors and still wouldnt spray. Installed an updated injector unit and vehicle started right up. Also the engine was a new crate unit and reused cu...
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