Question about 2001 GMC Sierra 2500HD

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Timing on a 1999 350 gmc it saids you cant time it

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Hello Eagle.
The timing is set by a crankshaft position sensor that is mounted at the front of the engine near the crankshaft. The computer sets the timing.
But there is an adjustment on the distributor to set the point of contact of the rotor to the distributor.
This must be adjusted with the use of a scan tool that is capable to read the degrees plus or minus on GM vehicles.
Another common problem that is seen with these engines is a worn gear at the bottom of the distributor. This wear throws the point of contact out and will cause misfire. Here again after this repair the scan tool will be needed to reset the point of contact.
I hope this helps to clear the issue for you.


Posted on May 01, 2010

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They say you cant because the timing matks are on the camshaft and crankshaft sprockets. you can replace the beltor chain,then remove the umber 1 sparkplug. have a friend hold a pen in the spark plug hole,while you turn crankshaft with breaker bar have your friend tell you when he feels the piston hi the penand psh up. and have him immediatly tell you when it starts to go down. when he feels it stat to go down,stop turning the crankshaft,as now you have it set at top dead center(TDC). install the timing belt or chain,and now your vehicle will start as soon as you barely bmp the ignition.

Posted on May 01, 2010


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