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  1. #1

    Default Can this happen?

    Yesterday while driving to work, my car did a couple of misses, then shut down completely. Pulled over in a parking lot, popped the hood and found my IAC wire had came off and fell down on the header. It melted the coating off and shorted out on the header. I pulled it off, but it still would not start back up. I then noticed that the fuel pump is not coming back on. Could a short from the IAC wire take out my fuel pump? I checked the inertia switch and it was not tripped. I can hear the relay clicking when I turn on the key, but no pump running. Suggestions?
    1986 ACS McLaren Capri
    1971 Mustang
    1968 F100

  2. #2
    FEP Super Member xctasy's Avatar
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    Default

    Yes, its possible, but it is most likely the earthing. Ak Millar in the 1984 Impco Technical Services Bulletin said the low operating Reference voltages of the EECIV cause many problems. There is no Malfunction Indicator Lamp, so you have to pull DTC codes.

    What happened with the IAC wire might influence the ECT sensor, and in turn, other stuff may trip out.

    See https://www.allfordmustangs.com/foru...old-start.html


    See http://vb.foureyedpride.com/showthre...-power-problem



    The IAC wiring has a very important diode inline with it on 86-88 models not fixed by the Ford TSB, but 89-95 models have the diode built into the IAC valve itself.

    See http://vb.foureyedpride.com/showthre...ng-Idle-SOLVED. The part can cause other issues.

    There are four or even five earth-out paths on EEC's with the later O2 sensor. It'll be an earthing issue caused by voltage going where it shouldn't.


    Quote Originally Posted by erockk View Post
    it wired into the connector coming off of the idle air controller.



    mine was in the wiring harness (not my engine but the best picture i could find)

    Follow this process intimated by Joel 5.0. Follow his stepwise advice first.
    http://sbftech.com/index.php/topic,29655.0.html

    I'd personally code read the system, by The five point plus earth connector which works as a basic system test.


    Fords original plan in 1980 was the Star Code reader, and the voltage swipe method works if your perceptive. Then the voltage reference got changed with the new EECIV, from 12 volts to 5 volts. Digital sweep gauges were the safe way out for Ford.

    For everyone else, NNOVA 3149 Extension Cable for Ford Code Reader (Item 3145).

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