Hello,.......OK so I searched my topic,but really couldnt find any staright answer to my ?,and i dont have time to keep looking,so i apologize if there is a post with specific instructions to my ? i just could not find it,so with being said im gonna ask a simple question hoping for a simple answer.Please save me the "I would have used a ___ instead" to yourself.If $ was not an issue,"I would have went with something diffrent"

I have a 2002 F150 XLT Triton 2X2 with 4.6L PI Windsor that just took a crap on me.

Money being the MAJOR issue for me right know,i was left with no other option but to purchase a 1998 4.6 NPI Windsor out of a F150 for basically almost nothing.They even gave me the WHOLE wire harness i mean every single wire harness out of the truck including computer/brain ect ect

Yes i know im losing "Horsepower" and am going backwards instead of Forward but i had no choice so be it.

What Exactly will i have to change to complete the swap?

-Can i use the orignal COP's?Or do i have to use the Coil Packs with the new motor?

-Since my truck has the stock PI tune,will i have to get a new "tune"for it to run correct with the NPI motor?

-Do i have to relocate the ECT sensor or change any other sensors,ECT?

-Please provide me with any and all exact details this sawp inquire's?


Thank you for your help,i appreciate it VERY MUCH and yes if had the $ i would have did a DIESEL swap NOT a lightning or Harley but money being the rude of all evil i was left with no other choice so Thankyou very much

 

Use all your stock harness, COP's and sensors. Shouldn't be more than 2 or 3 sensors that need to be relocated or extended wires, they will be very evident when you get the new engine in. I would imagine you'd need a tune since it is needed to go the opposite way.

 

ok the motor is in.i used the stock harness,cop's and "sensor's" and everything is hooked up all except for the 2 sensors that are on the front of the intake manifold....."my old intake did not have them"..........i have the connectors that go to the new sensors but i dont know where or if i should wire them into the harness...... including pics of the sensors and the plugs that go to them

 

Here is what you really wanted to know about the head swap.
A The NPI motor has open chambers in the head and a piston volume design to make the their spec CR.
B. The PI heads are somewhat closed and an increase in piston volume to attain the spec CR.
If you cross a PI on a NIP motor, the CR may go over 10 to 1 and become a problem with spark knock due to the PCM program having to aggressive ignition curve, not matching.
This comes about from the smaller piston crown dish volume on the NPI engine with the smaller PI chambers.
You are playing with an engineered system so need to know what likely will happen and what you do about it, then it may stiil present some issues.
Intake manifiolds may not interchange.
The exhaust ports are a different shape as well between the two.
All this info is on the internet.
These engines have had so many production changes in design over the years that you don't know what you have until it comes apart.
Good luck.

 

No that's NOT what i wanted to know,but thanks anyways!

 

Hello. Did you get your PI to NPI swap running? If so how is it running? I am getting ready to do a 99 f350 5.4 to 2000 Expedition swap. I know the 2000 is a PI engine but the 99 F350 5.4 doesn't have the PI stamp on the heads so I am no sure if it's PI or not.

Thanks
Chris