65bluestang

hello all,
im trying to put efi from a fox into a 65 mustang 289. i am having trouble finding out the wiring situation, i need to know what sensors and other wiring i do not need from a stock harness and how to properly take them off the harness. also i have heard the firing order is different, how would i go about rearainging the injection setup to the firing order i have. any helpful hints? -

92hatchLX

your 289 doesn't have the same firing order as the 5.0 HO.

vristang

Rearranging the injector harness will not give very good results. The computer expects to see pulses from each cylinder at the O2 sensor at specific times, according to the firing order. If you change the firing order will most likely have issues with air fuel corrections.

It would be easiest to swap out the cam in the older block.

As for the wiring...
I would find a donor car and pull all of the efi off of one car. You will need the computer, harness, and all sensors. Mixing and matching these three items can cause issues, as ford changed the wiring harness and pin locations on the computer several times.

As far as what is really needed, that depends.
The emissions stuff can be removed, but all other sensors will be needed.

I would like to hear about your progress.
Good Luck, it sounds like a great project

jason

luckythirteen13

thats not completely accurate. the same thing happenes when you put on long tubes. the o2's are farther fromthe exhaust ports so the pulses take longer to get to the o2's. afr isnt effected too much. but vristang is right, there will be some issues

vristang

I don't think the long tube problem is the same as the firing order problem, although they are similar.

It seems to me that long tubes simply delay when the pulse hits the O2 sensor, due to the increased distance from the valve.

Firing Orders-
Early 289 & 302 1-5-4-2-6-3-7-8
302HO & 351w 1-3-7-2-6-5-4-8 (this is all 83-93 Mustangs, and all 5.0 Explorers)

When you change the firing order though something else happens, due to injectors changing banks.
When number 1 exhaust pulse hits the right O2, the signal is delivered to the eec, and the eec makes the necessary changes. If you rearrange the injetors however, several injector harnesses will switch banks. If the EEC is not informed of this change (via a custom tune) issues will arise. The computer will have a hard time metering fuel, as it is no longer getting accurate O2 data.

Some have said that a custom tune will make this work, but others have reported serious issues with this type of swap, even if the injector firing order setting is changed in the eec.
I think it depends on what software is being used to tune though?
For example the tweecer is notorious for not allowing access to all of the eec variables.

Hope that made sense,
jason

rmodel65

hes already got a 351 cam he said so his firing order will be correct

vristang

I still don't see where this was stated

Regardless...
If using the 289 cam you will have major issues with the efi.
Swap over to a 302HO cam or a 351w cam. This will be the easiest way to do it right.

If you already have a 351w cam, then you should be all set to go.

jason

rmodel65

its posted in the classic section also