Originally Posted by 302 efi
Hi ive got a 1987 f i50 that had a 302 efi, i swapped it to a 1994 351 efi . i used the 302 wiring harness, chaNGED the ecc to a 1988 351 efi and took the shaft from the 351 distributor and changed it with the 302 shaft and now running that 302 distributor with the 351 shaft in it. the motor just wont run. any ideas , anyone do a similar swap. also what controls the firing order.
All I can tell you for sure on this one is that the firing order is determined by the distributor. Set the engine up at top-dead-center at cylinder #1, both valves closed, and be sure the rotor in the distributor points to the wire going to #1. The firing order for the 351 is 13726548 and the 302 is 15426378. The order should be annotated on the intake manifold casting. (The different firing order for the 351 takes power load off the front main bearing.)
I'm thinking as well that the system is not compatible with the '88 ECC and all the various sensors used on the 302 will have to be carried over to the 351.
The two engines are essentially the same except the 351 has a higher deck, a heavier crank and a different firing order. I'm not sure if the intake manifolds will interchange; if they do, then use the whole intake system from the 302 on the 351 or at least adapt the throttle body from the 302 to the 351....all with the idea of preserving the original sensor configuration so the ECC will know what's going on.
Anyway, get the firing order straightened out....it could be the major, if not the only, problem with the failure to start.