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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 15, 2011
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Open Help Requests for GM
Help Request Answers
2004 Cadillac CTS 3.6L Excessive Emissions VIN: 1G6DM57734
this vechicle after fill up will set a p0446 and start rough like its flooded. checked the canister and vent valve no sign of raw fuel but replaced both. smoked gas tank at cap i have flow though the gas vent line (the big one on the canister) and though the p... Trouble codes: P0446
1990 Chevrolet Lumina Euro 3.1L convertor VIN: 2G1WN54T8L
Hi guys, I have a simple problem. An elderly lady came into the shop with a 90 lumina Euro saying the car shudders and stalls at stops. After test driving we found that the convertor isn't releasing. It will not release unless you shut off the the ignition. ...
2003 Chevrolet Malibu 3.1L No Start VIN: 1G1NE52J43
u1000 problem in comm line 2. i get .3 volts on purple wire at dlc, i know it should have around 2.5 volts, the .3 volts goes away when i unplug body module, so i assume the body module controls the voltage in comm. line, i cant clear this code in engine or tr... Trouble codes: U1000
2004 Chevrolet Avalanche 1500 Z71 5.3L dash lights VIN: 3GNEK12TX4
I have a 2004 Chevrolet Avalanche, it keeps blowing the dash lights fuse every time it's replaced.
2004 Chevrolet Malibu 2.2L Battery VIN: 2G1WF52E14
Battery goes dead after sitting for 3-4 days with no vehicle movement. Have found if unplugging bcm amp draw goes away. Tried new delco bcm same problem. tried new instrument cluster. same problem. Have taken dash & instrment cluster out of interior and inspec...
2000 Oldsmobile Bravada 4.3L MIL Lamp on VIN: 1GHDT13W1Y
thank you for your help.. p0327 knock sensor .. i dont have that much knowledge about this code,the car came from a dealership,it looks like the knock sensor is newly replaced,the distr. cap and wires are new the ignition modular new..i searched in IATN for in... Trouble codes: P0327
1999 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZH5284X
Vehicle came to us as a new owner. Previous owner had new egr installed. Part number checks out as the updated version. It appears to be functioning, as when vacuum is applied, engine dies. Catalytic converter was bad upon arrival, so new one was installed. En... Trouble codes: P0401
2003 Saturn Vue 2.2L Drive VIN: 5GZCZ33DX3
I have a 2003 Vue in the shop with a bad CVT, and am wondering if anyone has swapped in another style auto trans in place of this one.

Fixes & Summaries for GM
Fix/Summary Answers
1999 Chevrolet Astro 4.3L Driveline VIN: 1GKFK16R3X
Thanks to all who suggested transfer case even though I didnt list that it was 4wd. Drained fluid in transfer got nice bright red, then about a quart of muck. Questioned customer who finally admitted he just had transfer case oil change and thought it would ...
2001 Chevrolet Tahoe LS 5.3L Fire VIN: 1GNEK13T4Y
Thanks to everyone. I was inspecting a fire, even though you could tell there was a chemical used on the top portion of the truck. On the under carriage of the truck the fuel tank was there, but the transfer case housing was melted. The main shaft was intac...
2003 Chevrolet Silverado 1500 4.3L No Start VIN: 1GCEC14X93
I got carried away chasing codes instead of following protocol. I checked fuel and all ok. Check spark and there was no spark check power to coil no power to coil. I continued diagnoses of no power to coil and found a broken wire at the coil connector. Trouble codes: P1626 (pcm has not established communication with bcm).
2004 Chevrolet Silverado 2500 HD 6.0L abs VIN: 1GCHK23U14
Thanks again to all who have offered help- I have not been able to get the customer to bring the truck back in- he uses it for work and times are tough- he needs to make money while he can and right now he is busy. When he does bring it back he will bring the ...
2005 Chevrolet Workhorse 4.8L No Start VIN: 5B4HP42V15
Unfortunatly we never got this truck back into a no start situation despite squirting water by the gallons and tugging twisting and wiggling wires extensively,so we used all our guesses cleaned grounds,greased in connectors ect and returned the truck to servi... Trouble codes: P0171, P0174 (Fuel trim lean bank 2), P0335 (Crankshaft Position CKP Sensor Circuit), P0336 (DTC P0336 Crankshaft Position CKP Sensor Performance), P0719 (Brake Switch Circuit Low Voltage), U1041 (Loss of communication).
1988 GMC R2500 Suburban 5.7L Poor Idle Quality, Stall VIN: 1GKGV26K5J
we tracked it down to a bad distributor. The customer then desided that he did not want to spend the money to fix it. this truck had a new crate engine installed about a year ago we find out now...Thanks to all...
2002 GMC Envoy SLT 4.2L Stall VIN: 1GKDT13S82
thanks for all the responses .it was the throttle body .i cleaned it and problem went away.some times you got to check the basics.thanks again.
2002 GMC Sonoma SL 4.3L MIL Lamp on VIN: 1GTCS19W02
Thanks for all the replies tha fix ended up being the mass air flow sensor, after the third acdelco sensor finally got a good one ... thanks again Trouble codes: P0171 (p0174-), P0174 (testing and results).
2006 Pontiac Montana SV6 3.9L Engine cooling system VIN: 1GMDV33186
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