Question about 2006 GMC W3500

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Motor cuts off after a few sec. of running. after a few times of off and on it will run

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May be the timing could also be the fuel pump or injectors

Posted on Jul 23, 2009

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Hello Brad,

Will it start and run for 2 sec every time you try, or does it not start at all after the first attempt? My thinking is: immobiliser - do have a second key for this vehicle? If so try that next, you might have the transponder chip gone down in the key.

An immobiliser problem will normally let you start the engine every time, but will not run longer than a few seconds. A blocked exhaust also gives exactly the same symptoms as this, for example if your catalyst had broken up and blocked the exit pipe. I have seen this many times and know of many very experienced mechanics who have been caught out with exactly this problem.

Let me know if neither of these fix your problem.

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This is known to be as dieseling.

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Known reasons are alot to be honest:

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Does the motor run fine while idle and in gear?

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You might also find that the fuel filter is in need of a cleaning. Sitting that long can lead to a bit of rust dust in the tank, specially if you have given it a push.

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