I went in and changed the knock sensor and all the gaskets and put it all back together and it wont crank. I clecked the wire I unpluged and cleaned them and I am getting spark.

Heres the strange part, throwing no codes. If I take the 15 efi fuse out and then put it back in , try to crank it and it trys hard for the first couple seconds then gos back to just barely turning over. Ive redone the timing 2 times..

What else could be wrong?

How do you redo the timing from Nothing, just redoing it all the way?

 

make shure you are not 180 out on timing got to be on the compression stroke, if you have a compression checker check one of the cylenders to make shure if you dont have any compression your 180 out i have been down that road on a new motor ...

 

Wait; it's just barely turning over? That indicates a battery or starter issue...

What all did you do to the truck? What gaskets are you talking about replacing...head gaskets as well?

 

true TNRabbit, I misread on that!!! Yeah it sounds like the battery or starter issue or did you have any ground wires off or such ?