GM Automotive Technicians Technical Discussion and Fixes for Dec 2, 2010 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2003 Cadillac CTS 3.2L Havc VIN: 166DGM57N3 Car came in with complaint of no heat on driver side , or lack of heat -ran car in stall ,got good heat from both driver & pass sides _test drove car ,38 degrees out side ,pass side ran about 180 degrees driver side 60 to 75 degrees cheched all actuators seem ...	View
	1988 Chevrolet C1500 Cheyenne 5.0L engine stalls VIN: 1GCDC14H8J the engine stalls unless the steering wheel is turned all the way to the right.	View
	1991 Chevrolet K2500 Cheyenne 6.2L Poor Idle Quality, Surge, Stall VIN: 1GCGK24J4M Hello Diesel tech;s, This one runs fine but at times it will just quit, so far at idle only. Then after restarting it will run rough, like there is air in the lines, until she cleans out and then smooths out. Sometimes it may run rough for a few minutes. The w...	View
	1992 Chevrolet K1500 Silverado 5.7L Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GCEK14KON Truck is idling up and down and stalling. CEL is flashing on and off. Sometimes when cel is on I can see a code for 15 coolant temp shorted or open. A ESC module fault, computer fault, and prom or memcal fault. Sometimes other codes but when light flashes off ...	View
	2000 Chevrolet Silverado 2500 6.0L 4wd VIN: 1GCGK29U1Y Vehicle came in because of "Service 4wd" light on. Code was C0367- Front Diff actuator circuit High voltage. Followed flow chart. Tested entire circuit. It's a 5 pin connector that uses 4 circuits. Front axle feed circuit, ground circuit, front axle control ci...	View
	2002 Chevrolet Venture LS 3.4L Anti Theft VIN: 1GNDX13E42 The security system has disabled the injectors. I have tried several times to relearn pass lock however the security light on dash will not light and timer on scanner for relearn will not countdown. I have replaced the BCM for codes u1000 and b1884 (oil pressu...	View
	2002 Chevrolet Trailblazer LTZ 4.2L 4wheel Drive VIN: 1GNDT13S22 Hi everyone. Got one that is stumping us.. Vehicle came to shop with no 4 wheel drive, the wife stated that the 4 wheel drive light switch stayed on bright one day then flashed and the next day the light went out and no 4 wheel dr.. Scanned computer and found ...	View
	2003 Chevrolet Venture LS 3.4L Heater VIN: 1GNDU23E93 WOW, working on a 2003 venture van, complaint is poor heat. I noticed on defrost the heat is only warm, on every other setting it is a little hotter. If I hold the rpm,s @ 2000 it does blow hot. I checked for cyl head blown and the only thing I have not replac...	View
	2003 Chevrolet S10 4.3L fuel fill VIN: 1GCDT13X83 this is not a driveabilty problem but a fuel filling issue.in the last year truck gas tank was hard to fill up maybe 4 times .this time it took 45 minuets to put in 12 gallons.the neck fills up and takes too long to drain down into tank.there appears to be an ...	View
	2004 Chevrolet Cavalier LS 2.2L Poor Idle Quality VIN: 1G1JC52F24 This car at times will start good and then the idle will fall off and the car will stall. It will restart right away and will again stall out unless the accelerator is held down to keep enough rpms. The car can be driven when this happens if the accelerator co...	View
	2007 Chevrolet Express 1500 4.3L steering & brakes VIN: 1GCGG29U87 Fed ex van came in with a rattle noise and vibration with engine running and turning wheels and/or depress the brake pedal. Condition occurs with vehicle sitting still. We have not driven vehicle. We suspect p/s pump and/or inlet or outlet lines from brake boo...	View
	2008 Chevrolet Silverado 2500 HD LT 6.0L Fast idle VIN: 1GCHK23K18 Vechicle is from a car lot , came in with ses light on , had codes,121,2270. Cleared them and 690, 2119, caame back . Cleaned throttle body, then has fast idle. We scoped the tps's (both) found seconary to have a bad gliych. Replaced throttle body with a new g... Trouble codes: P0121, P0690, P2119 (Throttle closed position perf), P0507	View
	1995 GMC Safari 4.3L Surge, Cuts out, Stall, Misfire VIN: 1GKDM19W5S Been around the bend and back again. Initially came in with a rough idle and stalling. Would start on 4 cylinders, and then run on 5, and then 6 after awhile. Found a burn path in PROM, replaced prom and computer. Van runs OK in base timing mode, albeit with a...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1987 Buick Century Limited 3.8L Excessive Emissions, Poor Idle Quality, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G4AL5133H All right, here we go.. The car runs pretty well now and does not stall. Much better than it has run for a looong time. (the "no balance shaft" makes sense for my slightly rough idle right now. What I found chasing through everyones suggestions ad tracing... Trouble codes: 42 (Computer Controlled Coil Ignition or Bypass Circ. Failure), 43 (Electronic Spark Control Circ. Fault), 44 (old Lean).	19
	1998 Chevrolet K1500 Silverado 5.7L MIL Lamp on VIN: 2GCEK19R6W thanks for your help, we did perform the reflash for the pcm, the fault code did reset after a short road test, the fix was replacement of the pcm, thanks for your help. Trouble codes: P1404, P0446.	11
	2002 Chevrolet Trailblazer LT 4.2L Air Bag VIN: 1GNET16SX2 I checked and rechecked most everything sugested and will replace the SMS module if the vehicle ever returns. Had some great replies and ideas (tried them all). Sometimes you go with the improbable when the logical dosen't work. Thanks for all the great res...	14
	2008 Chevrolet Impala LTZ 3.9L shifter VIN: 2G1WU58338 WE HAPPEN TO HAVE ANOTHER IMPALA COME IN TO THE SHOP AND LOOKED AT THE WIRES ON THAT CONNECTOR TO FIND OUT WERE THE GO THANKX FOR THE REPLIES.	2
	2004 Pontiac Vibe 1.8L Lubrication VIN: 5Y2SL62864 Thanks to everyone who replied. We recommended to the customer to replace the motor as that was the best way to fix the sludge issue. Customer denied to replace motor and wanted a "quick" fix. Flushed the motor to say that we did, Expressed on repair order tha...	11

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