Thank you.

I have a custom install that I am trying to sort out. It uses a MAF
sensor and a 1993 A3M computer. There is a jumper between the anti fuel
relay and the eec power relay. I assume that is to defeat the gas shut-off.

My son and I tracked down the wiring from a mustang wiring diagram. The
engine is the forged piston year... i believe earlier than the wiring.

The wiring for the lower portion like engine coolant sensor, throttle
position, EGR valve position, barometric pressure, sensors all come from
the 1989-90 diagram.

The wiring to the computer for the upper part of the diagram comes from
the 1991-93 wiring diagram. fuel pump relay, canister purge, injectors,
MAF sensor, etc.

The engine is not running well, and I am trying to figure out what I
have and how to diagnose it. I just went through all the wiring to make
sure all connections and wire were good. Now I am back to tracking down
issues.

My original question you answered was regarding a local mechanic that
looked under my hood. He said that  there should not be a barometric
sensor on the MAF engine. Obviously that gives you an idea of what I am
dealing with locally.

I am trying to do the work myself at this point. The motor is in a 1975
bronco. I sometimes go off-roading and worry something may shake loose
and I would have no idea what to expect. At this point, I know most of
the elements, now I just need to figure what to fix.

The mustang wiring is only wired with four wires to the bronco. Other
than that the system is self contained. I just have to figure out some
problems.

- low power
- rich fuel
- high idle
- if gas punched or revved at all, it does not idle down very quickly

Those are some of my problems. I am still looking for local mechanical
assistance, but I am trying to support local mechanic with this news
group. I appreciate any thought my mechanic look more closely at.

The mustang motor is all stock except for a 4° cam advance to lower the
torque.... stock cam, forged heads, in-tank mustang fuel pump. I am
using the old bronco pulleys, water pump and such. Made the conversion
easier.

Well, thanks again for your answer. The mechanic will help I am sure.
It's not the type of work mechanics generally seek out. Not much profit
involved. He is just going to give me a couple hours and check some
things. If I can suggest something from this message board, all the
better. I can certainly check many things myself.

Lawson

eec power relay  fuel  Relay anti fuel relay

I know you are correct as I was wondering if something had become
disconnected when I found the open connection. I checked the mustang
book that said it was a vent. You have backed up that idea. thanks.