GM Automotive Technicians Technical Discussion and Fixes for May 28, 2010 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1994 Chevrolet K1500 Silverado 5.0L Excessive Emissions, Poor Idle Quality, Surge VIN: 2GCEK19H3R Hello all. This truck is driving me kind of crazy at this point. It came in with a idle surge and stalling problem. The timing was way off, once that was set correctly it stopped stalling but the idle still surges. We tried a new IAC valve and tune-up with a c...	View
	1996 Chevrolet K1500 Silverado 5.7L Fnt Brakes Hey fellow techs, This truck came in with intermimtent pedal drop and high hard pedel till about half stroke with the pedal, replaced master took care of the sinking pedal. still had hard pedal, replaced booster, This took care of the hard pedal. After test dr...	View
	1997 Chevrolet Astro LS 4.3L 3-2 ahift VIN: 1GNDM19W6V No power, stumble, hesitation, etc. The EGR valve operation was not at fault, only the internal pintle position sensor. Distributor caused very poor performance, I was almost certain that I had a plugged CAT or otherwise restricted exhaust or my fuel supply wa...	View
	1998 Chevrolet Cavalier Z24 2.4L Cooling Systems VIN: 1G1JF12T3W Hi guys, need help on this cavalier. It is 2.4l. Customer state at idle temp gauge goes to 3/4. So he replaced the thermostat. Didn't fix the problem. Now the problem is here. It goes to 3/4 at idle bring the idle to 2000 rpm gauge goes back to 1/2 way.ok circ...	View
	2001 Chevrolet Tahoe LS 5.3L Interior VIN: 1GNEK13T61 Hello everyone:i need help on this tahoe my problem is that the fuel gauge reads empty,volt gauge reads 0 volts red charge lite on on ipc,service 4x4 message,low fuel message,security message.shift idicator does not work.originally ithought i fixed this vehicl...	View
	2002 Chevrolet Impala LS 3.8L Passlock? VIN: 2G1WF52E02 This vehicle came to me with a complaint of strange happenings with the keyless entry system.customer states that one night his wife went to church and got trapped inside car because doors did not unlock automatically after puting it in park and shutting the c...	View
	2004 Chevrolet Malibu Maxx LT 3.5L Alternator VIN: 1G1ZU64824 Thanks in Advance for any help. This is my first time so be gentle. Have 2004 Chevy Malibu 3.5L. Customers Original complaint was that the service engine soon light was coming on and off. (NOT THE CHECK ENGINE LIGHT). It is a picture of a car with a wrench in ...	View
	2004 Chevrolet Silverado 2500 HD 6.6L Poor Idle Quality, Misfire VIN: 1GCHK29274 Researched the codes a little and saw no obvious rubs in the wiring. Pulled and twisted the wiring a little cleared codes started the vehicle,did the relearn,drove through 3 shift cycles(running good)after the 4th stop bang back again, including the TCC code a... Trouble codes: P0203, P2149, P0742	View
	2005 Chevrolet Silverado 2500 HD 6.6L Heads VIN: 1GCHK23295 This Duramax has blown head gaskets due to overheating because of a coolant leak. I pulled the heads. Some of the head bolts in the middle , down low were not very tight. The gasket wore a groove in the surface of the head around the combustion chamber. With a...	View
	1999 GMC Savana 1500 5.0L MIL Lamp on VIN: 1G53678563 cant seem to fix p0340 sets right away have replaced dist due to worn cam gear, Have good square pattern at pcm with scope reluctant to replace same old story $$$ pcm looks rough white powder but pins look ok Trouble codes: P0340	View
	2000 GMC Yukon Denali 5.7L No Start, Stall VIN: 1GKEK13TX1 Hello all Chevy/GM techs. I have a problem with this vehicle. The vehicle will start and run for a undetermined amount of time, then the ECMb fuse blows. This might happen right away,(as soon as the engine cranks,) and sometimes few minutes after restart. I vi...	View
	2003 GMC Sierra 2500 6.0L Front Air Bag Sensor VIN: 1GTHK23UXF This is an excellent maintained truck. Driver side front bumper hit with no visible damage. Air bag did not deploy since this was a less than 5 mph parking lot collision. However, the air bag sensor is damaged and needs to be replaced since air bag light is on...	View
	2002 Oldsmobile Bravada 4.2L Poor Idle Quality, Hesitation, Stall VIN: 1GHDT13S62 Hi guys I have a 2002 Olds Bravada with a 4.2L DOHC. The vehicle has a tip in hesitation with a light throttle application from a stop. It has stalled twice and when on decel from the light throttle application it tends to hunt for idle. When applying light th...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2000 Cadillac Seville SLS 4.6L Ride Control VIN: 1G6KS54Y4Y Thanks for all the input!!! We did install them and the light is on on the dash as we new it would be. I did try and purchase the by pass kit for the light but could not buy it seperatley. It does ride stiffer than the air ride and the customer will deal with ...	13
	2005 Cadillac DeVille DHS 4.6L electric window & locks VIN: 1G6KE57Y55 This Cadilac had the wrong door harness installed in the left rear door ! The way the car can tell between the left and right modules (same part number) is it knows it's a left, if there is a ground on pin B6 on the right the pin is open. My wrong harness had ...	6
	1997 Chevrolet Tahoe 5.7L 4 wheel drive VIN: 1GNEK13R8V Thanks to all responses. I found the problem thanks to a few who told me to check the two wiring connectors on the transmission that are exactly the same. I accidently plugged the wrong connectors together and found this error by pulling a wiring schematic and...	10
	2004 Chevrolet Silverado 1500 4.3L Starting VIN: 1GCEC19X64 Thanks for the replies. This truck had our attention even though we had other cars waiting to be worked on. We would walk away and next thing you know someone was looking at something on this truck. After doing some power and ground tests at the PCM we found v...	4
	2006 Chevrolet Trailblazer LS 4.2L Lighting VIN: 1GNDT13506 Thanks for the help everyone. This was a tough one. Many hours in it but we found a ground at the bottom of the dash on the passenger side was loose. This was causing it to work sometimes and not work other times. There were 4 wires run in to a little box that...	7
	2006 Chevrolet Silverado 2500 HD LS 6.6L Dash VIN: 1GBHK24976 Thanks everybody for all the replies. As Dan said, there isn't anything behind the ip. As most said, a closer look at the lower column revealed the bearing housing broken. It would have been an easy repair, but a section of the bearing housing had worked its w...	9
	2000 GMC Sonoma SLS 4.3L Oil leak VIN: 1GTCT19W6Y Advice was, as always, great. Pulled engine and sure enough the rear main was leaking. Due to this being a new long block the builders are going to warranty it and give us a new one. Thanks again, was fairly sure but wanted some support before I confronted ...	13
	2000 Other GM zanzibar 300CID Poor Idle Quality, Surge, MIL Lamp on, smoke Hello all, This RV isn't fixed yet. My friend sold it "as is" before I got the code definitions. Thanks to Greg Scheff at Patten Power Systems for providing me with them. They are as follows: 15- Injection actuation pressure voltage high,(possibly an ...	3
	1998 Pontiac Grand Prix GT 3.8L Suspension VIN: 1G2WP52K4W thanks to all we have changed both axles and both bearings and still have the same problem. the struts were change about a month before we got the car and the noise was there before that so customer has desided to just live with it til something shows up more ...	15
	2006 Pontiac Wave 1.6L Engine Camshaft VIN: KL2TW69606 THANKS FOR HELP. ALLMOST EVERY BODY SAYS VALVE ARE DAMAGE. SO WE DICIDED TO GO WITH USED GOOD ENGINE. THANKS A LOT	10

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