Help no spark

dalejrfan8

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I"m working on 2006 Gmc Sierra 6.0 2500 4x4 pick up truck.I replaced the motor with 2005 Gmc Sierra 6.0 2500 4x4 . Got the motor installed and all hooked up so I hit the key and it fired up so I let it run for 5 mins and shut it off.Went back to do a restart and nothing so I waited about 5 mins and hit the key and it fired up. Let it run for awhile and then shut it off went back later and hit the key and nothing happen it would turn over but no fire. Now this motor ran fine in the last truck was a daily driver but truck was in bad shape..:mad. So I change the crankshaft senor and camshaft senor and still nothing it would turn over but no fire.I check the spark and nothing coming out of the coils. So I check to see if it had power to the coils and I have power.I check with test light and Oms meter .I put different coil on and still nothing.I'm lost:confused::confused::confused::confused:
 
A Pennnies Worth

I would check the input voltage to the coils if you haven't. If voltage is too low may not fire to the plugs.
Do a search on the internet.
 


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