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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 13, 2004
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Open Help Requests for GM
Help Request Answers
2001 Cadillac DeVille DHS 4.6L instrument digital dash VIN: 1G6KE57Y41
hi everybody : this is one of my boss's used car,he has been driving it for more than a month and has no problem until 2 days ago the battery went dad and he boosted it and driving til now. Today,his son doing a completed clean-up on this car(car wash and int...
1987 Chevrolet motorhome 454CID cooling system VIN: 1GBKP37W6H
This vehicle came in to the shop with a cracked head. Customer wanted engine to be completely overhauled not just replace the head. After overhaul the vehicle temperature starts creeping up if you drive over 55 mph. If you maintain speeds above 60 over a 5-7 m...
1991 Chevrolet Lumina Z34 3.4L Excessive Emissions VIN: 2G1WP11X92
hi everybody : this car failed e-test high Nox 2208 ppm at cruise !! I changed the O2,cat,removed plenum clean the egr passage (it was plug up solid !!),after I clean up the passage and I tested the egr valve my feeding 12 volts to 1 of each 3 terminal of the...
2001 Chevrolet Tracker 2.0L timing chain VIN: 2CNBE13C11
broke upper timing chain and upper chain guide.the first time just over a month ago i replaced all exhaust valves do to the upper chain guide(top on cam caps)being lodged between upper chain and cam gears. could not find any known problem with chain or guides ...
2002 Chevrolet Silverado 2500 HD 8.1L engine VIN: 1GCHK29G52
On intial startup after sitting over night. Engine starts and is quite. After about 5 seconds of running a valve train noise develops. Sounds like noisy lifters. Starts gradual, gets louder. After about 45 seconds of running the noise slowly fades away. Have a...
1997 GMC Safari SLE 4.3L vents VIN: 1GKDM19W2V
we have this van that under acceleration will drop vent operation to defrost - have replaced check valve and repaired on broken vacuum line - still happening - have good vacuum supply - vacuum test all line at connector at rear of control head and all hold goo...
1998 GMC Jimmy Envoy 4.3L 2-3 shift VIN: 1GKDT13W6W
Hello all! Trying to help a fellow tech on this one. Vehicle winds up going into third gear, causing a mil and a third gear default which it will stay in until the mil is cleared. With a volt meter on the 2-3 command wire out of the VCM, it will apply shift wh...
2003 Pontiac Bonneville SE 3.8L MIL Lamp on VIN: 1G2HX52K13
I could realy use some help right about now! Got this GM with MIL on and code P0171 fuel trim system lean. Checked scan data, fuel trims indicating lean condition. Vehicle runs a little rough when in open loop, and smoothes out with propane. Runs ok in closed ... Trouble codes: P0171 (Fuel trim system lean)

Fixes & Summaries for GM
Fix/Summary Answers
1993 Cadillac Seville STS 4.6L cooling VIN: 1G6KY5298P
Many responses were head problems, some said possible rad plugged, one reply was that water pump may have incorrect impeller, customer declined to spend more diagnostic time on this vehicle and therefore no fix to this problem. Thanks to all who replied.
1998 Chevrolet Tracker 1.6L MIL Lamp on VIN: 2CNBJ136XW
thanks 3 people told me the passage was pluged i cleaned it and that fixed it i cant believe how sensitive the egr system is on this car i would never have thought that little bit would make the diference .once again thanks Trouble codes: P0400.
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