I just did an engine swap on a 1999 f150. The old engine was a 4.6 with the coil and plug wire model and the new engine has the coil over plug. I have the wiring harness from the 5.4 and I am wondering if I should use the coil over plugs with this harness or go back to the old coil with plug wires. The engine came from a 2001 F150 and is a two valve engine. If I dont have the 5.4 pcm, is this a lost cause?

 

You don't have the COP drivers so, it must remain coil pack. There's no performance advantage running a COP ignition anyway.

 

If I had the PCM would it make a difference?

 

Well, if your looking for problems, that's one good way to find some...and you will no doubt.

 

I would just run the 4.6 electronics and be done. You'll find no performance gains....

 

Make sure you update your thread if you attempt this...because you WILL fail lol.

Seen it many times in the past.

Your welcome.