GM Automotive Technicians Technical Discussion and Fixes for Feb 16, 2009 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1996 Cadillac Seville STS 4.6L transmisson VIN: 1G6KY5291T vehicle came in with code p0717, replaced iss. code cleared no return. test drove and is taking off in second gear. tried new shift solenoids.all check balls in place. no codes. trans will shift through all gears with tech II. all data pids look good. any info...	View
	2000 Cadillac Seville SLS 4.6L heat/ac VIN: 1G6K554Y9Y Customer complaint of no heat or cooling. Tested for trouble codes first, code b1343 air inlet door movement. Didn't figure this would be causing no heat or a/c so started checking other things first. A/C refrigerant too low for compressor operation but did no...	View
	1995 Chevrolet Camaro Z28 5.7L temp VIN: 2G1FP22P9S Strange over heating problem with this 1995 5.7 p engine camaro. This car came in the shop with overheating issue and coolant in oil, we air checked the cylinders looking for blown head gasket by putting air in cylinder with valves closed, found #7 cylinder le...	View
	1997 Chevrolet Astro 4.3L crankshaft VIN: IGNEL19W9V This van seems to like staying at my shop. About six months ago we replaced the intake gasket. Two weeks later it came in with a lower end knock. We did not use the cleaning disks that are known for causing this problem. So we tore it down and replaced the cra...	View
	2000 Chevrolet Suburban 1500 LT 5.3L batterydrain VIN: 3GNEC16T2Y about every 60-90 days battery will go dead for some reason driver claims to hear a noise in vehicle but really can not describe it,is there a common problem out there we check everything we can think of of course it never will have the problem after we bring ...	View
	2002 Chevrolet Tahoe LS 5.3L Poor Fuel Economy, MIL Lamp on VIN: 1GNEK13Z82 This truck came in with a p0178 scanned and checked info on scanner and ms=0 and frequency=0 when running, wiggled truck and both stay 0. Checked wires at sensor only 3 and has 14.2v on power and ground wires and 7.2 on ref wire, scanner still says 0. Plugged ... Trouble codes: P0178 (fuel composistion sensor)	View
	2003 Chevrolet Silverado 1500 5.3L Cylinder Head VIN: 2GCEK19TX3 Guys, This truck has been driving me crazy. 2003 5.3 Silverado, 133,400 miles. Originally came in for coolant consumption issues. Found the truck has the Castech heads, which are prone to cracks/porosity issues. Oil was milky. One of my techs diagnosed, and t...	View
	2003 Chevrolet Venture LS 3.4L Poor Idle Quality, Stall VIN: 1GNDVO3EX3 This baby will not idle, IAC counts are at 255, I know I have a problem. No Vac leaks found, I cranked up throttle screw to get me to operating temperature to no avail. I am not sure where to go, the IAC does not activate with scanner. I did run the engine pri...	View
	2003 Chevrolet Suburban 1500 LT 5.3L Auto temp control and steering wheel controls VIN: 1GNFK16Z23 Need some help with this one guys. This vehicle has 2 strange problems. First, none of the lower buttons for the steering wheel controls work. I know they have cluster problems with these but I'm thinking clockspring but can't find a diagnostic procedure for i...	View
	1996 Geo Prizm LSi 1.6L timing belt VIN: 1Y1SK5268T the engine with the aforementioned timing belt setting spins like it has no compression and I was hoping to hear that this is not an interference engine. Any help would be greatly appreciated.	View
	1994 GMC K2500 Sierra SL 5.7L No Start VIN: 2GTFK29K3R This vehicle starts hard with extended cranking time after it has been driven and fully warmed up and shut off, it will start and run fine after a lot of cranking. Starts good when cold. My big problem is that my Snap0n scanner will not communicate with the sy...	View
	1995 Oldsmobile Aurora 4.0L No Start, Misfire VIN: 1G3GR62CXS Vehicle towed in 2 weeks ago with a no start. Customer had just bought the car had it 2 days and then no start. Found bad fuel pump. Ordered one that was in customers price range. Removed old on and found that the retainer ring was completely rusted off. drain...	View
	1998 Oldsmobile Silhouette Premiere 3.4L abs/tcs VIN: 1GHDX03E8W vehicle came in with a customer complaint of the abs and tcs lights on in dash. When car is turned off then back on the lights go off. Checked for codes koer no codes shown with warning lights on. Turned key off and back on koeo and in history codes i get a C1...	View
	1998 Oldsmobile Cutlass 3.1L Oil Pressure VIN: 1G3NB52M4W This vehicle came in on a hook, Customer noticed chime coming on, then saw oil light come on. Drove a short distance due to loss of power, then towed in. Oil was two qts low and he added 4 qts. Drained excessive oil out and hooked up mechnaical oil pressure ga...	View
	2007 Pontiac Torrent 3.4L location VIN: 2CKDL73F37 Wanted to replace the PCV valve on this 3.4l Torrent, MOD says it's in the front valve cover, so we got one from local parts supplier, but it looks like it's integral to the V/C, doesn't look anything like the replacement part we got. Does anyone know if it's ...	View
	2000 Saturn LW2 3.0L pcm VIN: 1G8JW82R5Y The original complaint was an intermittant no-start condition. When it would not start, the fuel guage would not read, the VTD system was active and disabling start, the TAC (throttle actuator control) was clicking on and off rapidly, and the Tech2 will not co...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2002 Buick Rendezvous CX 3.4L 4 wheel drive not woring VIN: 3G5DB03E12 repaired lf wiring from wheel over cotrol arm. note pull back wire loom and peal back plastic housing around wire and found broken wire. then test drove lf worked ok but rf spped sensor code came up... crazy you have to tell the cust lf ok now but you now need...	17
	2003 Buick Century Custom 3.1L Starting VIN: 2G4WS52J63 Thank you to all that replied. Probably no real value to this post but hear are the results. We replaced the BCM the recified the blowing fuse issue. Towed car to dealer for re-programing of the BCM and car still had a no start condition, now had code b1477...	4
	2000 Cadillac DeVille 4.6L Mechanical VIN: 3557879058 Did engine, went smooth, phew!! thats a big job for a one man shop. Thankyou all once again.	9
	1996 Chevrolet S10 LS 4.3L timing chain VIN: 1GCCS14X9T Thankyou everyone for your help. It turned out to be worn cam bearings I didn't notice it when i first took off the cam gear because it has a gear that meshes with the balanceshaft right behind it and blocked me from seeing the damage. that took care of a lot...	9
	1999 Chevrolet Astro 4.3L Electronic VIN: 1GNEL19W0X I have cleaned the connectors at the module and the awd worked for about 2 weeks, It is now intermitent again. This is the shops van so when I have time I will replace module. If that works will post results. I am closing this post for now. Thanks for the hel...	4
	1999 Chevrolet Blazer 4.3L no start when cold VIN: 1GNDTW0X21 We were fighting two problems with this vehicle, hence the long reply time to be sure it was fixed. The ignition switch was cutting out when it got much below 20 degrees. We also had a fuel pump that always tested good, until we realized our gauge was defectiv...	20
	2003 Chevrolet Impala 3.4L cyl head VIN: 2G1WF52E33 Thanks to all who responded. Once the engine is disassembled & closely inspected, if no other problems are found, the head will be replaced or all rocker arm holes repaired with helicoil inserts to overcome additional problems. Most everyone was in agreeance ...	17
	2004 Chevrolet Colorado LS 3.5L Poor Idle Quality, MIL Lamp on VIN: 1GCDT13604 Thanks to all that replied. Could not duplicate the problem after roadtesting extensivly. So there was a TSB, to clean throttle body, so we peformed that service and ultimitly we do think that the cause of the code and the problem was that the pedal was gettin... Trouble codes: P0506 (Idle speed out of range.).	9
	1988 GMC K1500 Sierra SLE 5.7L Excessive Emissions, Surge, Cuts out VIN: 1GTDK14K6J First of all, thanks for all the help guys. As of this morning the vehicle started setting a code 34 and we found the vacumm signal to the MAP was only about 10" compared to 22" at the other TBI ports. We removed the TBI and flushed the port out with Carb clea...	29
	1999 GMC Yukon Denali 5.7L No Start, Stall VIN: 1GKEK13R7X ALOHA sorry for the delay in closing this help request, after trying about three times to relearn (no response from module at all) i found an old lock housing w/sensor , went with the mojority (everyone said to replace this sensor) Same thing, so i ordered a... Trouble codes: P1626 (anti-theft fuel enable system).	5
	2001 GMC Jimmy SLE 4.3L Headlights VIN: 1GKDT13W71 Hey Guys, Thanks for the replies. I took the advice of modifying the headlight assyembly and made it to fit a 9004 bulb. It took a little courage and patience but I did it and it works just fine. Now I need to do the other and maybe sell the unit that is still...	3
	2004 GMC C7500 Topkick C7C042 8.1L tachometer VIN: 1GDL7C1E84 Thank you, everybody, once again for your help. After reading the replies I received I went ahead and ordered a reman. IPC. It turns out the stepper motor for the tach was junk, just as some of you had suggested. I would not have ordered it if it hadn't been f...	5
	2004 Pontiac Montana 3.4L heater core VIN: 1GMDX03E64 The problem on the van has not been fixed. Most of the replies had good ideas. The customer has declinde further testing. I don;t know if he is going to live with the problem. Talked to the dealer seems their is nothing to do with this van it is normal. t...	13

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