GM Automotive Technicians Technical Discussion and Fixes for Oct 26, 2012 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1987 Buick LeSabre Custom 3.8L Stall VIN: 1G4HP5132H the vehicle dies intermittenly but it has not for us we test drove it nothing kept the car for a day took it several times on a test drive but nothing happenned, customer picked up the car and it dye on her, my question is how do I make it act up, I suspect it...	View
	2004 Buick Century Custom 3.1L 1-2 shift VIN: 2G4WS52J34 Hello fellow professionals, This Century came with with a delayed 1-2 shift concern that only occurred after the car sits for about an hour. After the initial delayed shift, it shifts perfectly. There is no slip or flare, and line pressure is the same whether ...	View
	1997 Chevrolet Monte Carlo Z34 3.4L Cooling Systems VIN: 2G1WX12X2V temp gauge will go to 260 and peg, then go back down. 3.4 DOHC CAM pos, car was towed in sitting for months, rats ate injector wiring, got it running found waterpump leaking, replaced with ac delco pump, at times the gauge will go and peg on test drives, has n...	View
	2001 Chevrolet Suburban 1500 5.3L transmission VIN: 3GNFK16T41 After installing the jasper transfer case we drove the truck around the block and it was very noisy.The noise was coming from the new transfer case.We removed the decoder motor and installed the one from the original transfer case and the noise is almost gone....	View
	2003 Chevrolet Monte Carlo SS 3.8L defrost VIN: 2G1WX12KX3 Have this Monte in for repair of insufficient airflow from defrost on cold setting only...On heat it blows great..after testing we pulled dash apart expecting to see a broken door or bad actuator...As stated it works fine on hot...After taking box apart we fou...	View
	2005 Chevrolet Impala LS 3.8L Interior VIN: ZG1WH5ZK45 we have a 2005 impala when you turn the key to on position the lights it goes through a bulb check then the fuel guage will light come on abs,alt,brake light and alarm will ding, ding,ding,then they will go off and repeat every 10to15 seconds when you drive it...	View
	2005 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13S15 Hello IATN, Im looking for a little assistance with something I admittedly shouldnt have started in the first place but the choice was not mine. It has basically become a timing chain nightmare. It started off with a bad exhuast valve seat on cylinder 2. I re... Trouble codes: P0014	View
	2007 Chevrolet Silverado 2500 HD Classic LS 6.6L no start, hard start VIN: 1GCHK23DX7 after a long soak,(3 hrs)or sit overnight, engine starts right up then shuts off after 10 seconds. will not restart except with a very long crank time. found no leaks on fuel supply line or filter. no codes in computer. truck drives out perfect. all data ...	View
	2008 Chevrolet Impala LT 3.5L Mode Door Actuator VIN: 2G1WT55NX8 Hi, to all chevy. Techs. This impala came in 10 days ago for noise in the dash. We trace the noise to mode actuator and disconnect it, noise stoped. That is why we changed the mode door actuator!kept the car for another day every thing looks very good ,so we d...	View
	2008 Chevrolet Silverado 1500 LT 5.3L Mechanical VIN: 1GCEK14058 Truck came in missing on cyl.#2 at idle .i have swapped plug,coil ,plug wire and injector with another cylinder misfire stays at # 2.compression is the same on other cylinders.this is an afm motor.i have heard of valve train trouble on these engines.i am hopin...	View
	1999 Oldsmobile Aurora 4.0L timing chain VIN: 1G3GR62C4X This request will be odd at best. I have limited experience with "Northstar" engines beyond routine maintenance and minor repair. What I am asking for in this request is to "pick your brains" to shorten my learning curve. That said, I am 59, I have been at thi...	View
	1993 Pontiac Grand Prix LE 3.1L Starting VIN: 1G2WH54T2P Customer had originally came in with a bad battery so it was replaced approximately a week later customer called said battery was dead and needed to be jumped, had customer come to shop where we tested battery and it failed so we replaced battery, shortly afte...	View
	2003 Pontiac Sunfire SE 2.2L purge can VIN: 3G2JB52F63 Purge canister filling with fuel.	View
	2002 Saturn Vue 3.0L Stall, Poor Fuel Economy, MIL Lamp on VIN: 5GZCZ63B12 I have been fighting this problem for six months now. The truck will run fine for weeks at a time with no mil. Then one day it will throw a code for the minimum throttle not being reached and a torque communication between ecus. The truck will go into limp mod...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1999 Cadillac Escalade 5.7L Accessories VIN: 1GYEK13R4X New Sunroof Motor took care of the problem, you did not need to learn it,the customer blame it on us , & we had to eat the cost. Thanks anyway guys	5
	2003 Chevrolet Silverado 1500 5.3L Cuts out VIN: 2GCEK19T43 Replaced the throttle Body assy and the vehicle has not returned with any problems... Thanks to all who helped. Trouble codes: P1516 (TPS/APP Difference).	7
	2004 Chevrolet Silverado 2500 HD LT 6.6L Excessive Emissions, Misfire OK. the best way to find the injectors that were causing issues was to watch the fuel rate and the balance rates when the rail pressure was commanded down. Then things made sense because I had some injectors that were over fueling as well as some that were u...	8
	2008 Chevrolet Silverado 1500 LTZ 6.0L No Crank VIN: 3GCEK13Y48 We finally fixed this truck!! First I would like to thank everybody for their input on this problem. After a lot of testing of the components and circuits that were suggested on this particular truck by everyone they all checked out to not be the fix. Finally ...	14
	2001 Oldsmobile Bravada 4.3L brakes VIN: 1GHDT13WX1 Replaced the used abs module and pump with a new gm pump and module. Did the system bleeding procedures along with the automated bleed with the scanner. It took a while to get the system bled, but it finally came out of it. Thank you all for the replies!	21

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