Engine Computer Question

[Scott B.]

Those of you running fuel injected V8s - what engine computer are you using?

I am putting a '94-vintage 302 in my '93 4WD, and am wiring it as a '93 (OBD-I). My current plan is to use an A9L computer (the "preferred" Mustang computer.) I plan to use a Ron Francis wiring harness, which eliminates the use of a truck computer.

Thoughts, suggestions, comments?

Thanks.

 

[Teddyzee]

That will be fine.
Mine happens to be an A9P, originally from an automatic Mustang. Only real functional difference is that the Auto advanced the timing sooner... They are interchangeable.

 

[snoranger]

Here's a little info on the A9L vs A9P. Hope it helps.

http://forums.corral.net/forums/eec-tech/1271225-will-a9p-computer-work-5-sp-car.html

 

[Scott B.]

Thanks for the responses.

I made a typo - I will be using an A9P (not the A9L) as I am running an AOD transmission.

 

[Teddyzee]

To summarize that article, and all of our swaps, I guess...
An Automatic fox body Mustang sends 12v to pin30 during a start. This is accomplished is the O2 harness (a loop right in the connector to the engine harness). There is an extra circuit in the engine harness that connects to the starter relay (fender mounted) on an automatic car. This is absolutely not need in a Ranger swap, and is the only auto/manual difference that applies to us.
In a manual Mustang, the loop in the O2 harness connector connects pin30 of the ECU to pin46 (the signal return, basically a sensor ground shared by all sensors)

In lieu of searching for the "correct" O2 harness for us swappers, you can simply splice the appropriate circuits together (pin 30 to starter relay, or pin30 to pin46) on the engine harness side of the O2 connector. This can be done right at the O2 harness connector, or as I did on my latest harness, somewhere near the firewall.

Hope this helps someone simplify this stuff.