HO

[Mercracer]

Alright..........I have searched the CV archives for a link to the pinouts for the Mark VII vs Box CV's, and can't find it.
The Mark ECU's are supposed to be plug and play? The 1991 Wiring diagram looks like for 91 Marks, they are different. Everyone has been using the 89 and earlier ones???

[88grandmarq]

To my knowlege, the wiring is the same. I recommend a '88-'90 Mark 7 ECM.
I used both an '88 and a '89 mark 7 ECM in my HO conversion. Also used a '88 HO SD Mustang ECM, they all worked. Mustang ECM you lose cruise control.

[Lincolnmania]

i too have a lsc computer......mine is from a 90 mark 7
scott

[Mercracer]

So.....you two just unplugged your factory CV/GM computer, installed the HO motor with the factory CV/GM harness and plugged the Mark computers in? No changing any pins for firing order, AC or cruise?

[Lincolnmania]

correct sir

:bump:

[Grand Marquis GT]

Amazing what happens when you ask the REAL HO masters, lol..