Apparently I need a new computer for my 1974 2.0 with D-jet fuel injection, Fuel Injection running too rich. Anybody know where to find NOS, rebuilt units or know where to send to repair one? Options

[tumamilhem]

Apparently the computer in my 1974 2.0 is not working properly and making the car run rich. Does anybody know where I can find another one or who to go to have mine rebuilt? It's for a 1974 2.0 with D-jet fuel injection.

Also my 3rd cylinder is misfiring. Would this have anything to do with the computer? If not, any idea what may be causing it to misfire? I have a new working AAR valve installed, my MPS works, no bad wiring in the wire harness or spark plug wires, the timing and dwell are on point and the valves are adjusted.

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[SirAndy]

Apparently the computer in my 1974 2.0 is not working properly and making the car run rich

I highly doubt it. They *rarely* ever go bad.

And it's not really a "computer" either, there really aren't any sophisticated electronics inside at all.

My money would be on either one or more faulty sensors or broken wiring.
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[r_towle]

Apparently the computer in my 1974 2.0 is not working properly and making the car run rich

I highly doubt it. They *rarely* ever go bad.

And it's not really a "computer" either, there really aren't any sophisticated electronics inside at all.

My money would be on either one or more faulty sensors or broken wiring.
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You should listen to the advice here, it's most likely not the ECU, which is hardware a/f maps the work or do not.
There is no way an ECU could affect tuning.

Inputs are
Cylinder head temp sensor
Throttle position switch
Manifold pressure sensor
Ambient air temp sensor

If this have all be properly checked, and the FI wiring harness has been checked, along with your ground connections and the fuel pressure, it will be an ignition issue.

Two things mentioned
Injectors sometimes get dirty after 40 years and can stick open
Cold start injectors can stick open all the time and spray in raw fuel

Both of these things can also make it run rich.

Not sure of your location, but there may be better mechanics to bring your car to that are more familiar with D-jet fuel injection.
It's not complicated, and everything can be tested in an hour or so to rule out part replacement methodology