Question about 1991 GMC K1500

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GM 305ci. No start

I'm trying to repair a 1991 GMC C1500 305ci. I replaced the timing chain, have checked and rechecked the alignment of the gears and distributor yet cannot get the engine to run. There is spark and fuel and the engine barks, but will not run.

Any ideas ?

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Make sure you have number one cylinder at top dead center, do this by removing the spark plug and puttin a screw driver in it, when it gets to the top stop, you turn the motor by using a socket on the crank shaft, if you do not get the cylinder to top dead center this will cause the problem, how ever this means you have to remove the chain again and realign every thing.

Posted on Nov 26, 2008

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  2. If you have access to a scope, check the cam and crank patterns. If a pattern is missing, suspect a bad sensor or a slipping tone ring. Remove the cam gear and the crankshaft harmonic balancer and inspect the tone rings for proper alignment and make sure they're not loose or damaged or that they haven't sheared the key that aligns them. If they are properly installed, replace the sensor.
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