4V swap. Harness or PCM

[maximusslade]

I'll keep the question short. I am doing a 4V swap into my P71. If you guys were doing it, would you rather alter the harness or would you rather just swap out the PCM? I would have to get a tune either way.

[mattdohc]

just alter your cv harness. I just did this to my 03 lx sport.

[Bad_S55]

Rewire the stock harness & get a tune. That's it.

[Chayton]

im putting a 98 4v in my 02 crown vic sport. I read something about the fuel systems being different?

[massacre]

What car is the 4v from?

[maximusslade]

Click the link in my sig... but in short, it is a '98 MkVIII block, '01 Cobra heads, '03 Marauder intake.

[massacre]

Is the ECM return style or returnless? That is what will dictate which fuel rail to use.

[maximusslade]

Both fuel systems are returnless... but what bearing does that have on whether to splice the wiring harness or use the marauder PCM

[Chayton]

Both fuel systems are returnless... but what bearing does that have on whether to splice the wiring harness or use the marauder PCM

hes talking to me.

[maximusslade]

Oh.. okay... I think both the '98 and the '02 are both systems that have fuel returns. I would surmise they are the same system, so long as you are using the '98 4v fuel system.

[Zack]

Both fuel systems are returnless... but what bearing does that have on whether to splice the wiring harness or use the marauder PCM

WRONG
The end

[Zack]

The pcm is programmable for either type of fuel system

[Chayton]

WRONG
The end

which one is which?

[Zack]

If you are swapping engines, I suggest you do more research.


Sent from my iPhone using Tapatalk

[maximusslade]

Okay... we need to back up a few steps here gents. *I* am not asking about the fuel system. I am asking as to whether it is simpler to splice wiring or go with a Marauder PCM in a Vic...

Before someone starts spouting of the ever useful one word answer, let's make sure we are answering the question asked...