1990 idle control motor part number?? | Ford Escort Owners Association (FEOA)

1990 idle control motor part number??

Discussion in 'Tech & Repair' started by Bluestar, Aug 4, 2019.

  1. Bluestar

    Bluestar New Member

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    Having trouble finding a new idle control motor for my 1990 escort. All parts stores are pulling up is a idle control valve and what I need is a stepper motor. Anybody know a part number or where to find one? I have been looking at advance auto.. Napa.. or autozone.
  2. Joey_Twowagons

    Joey_Twowagons FEOA Member

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    Check the Rockauto website, they have pictures for most of their parts.
  3. denisond3

    denisond3 Moderator Staff Member

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    If the first gen Idle Air Control Valve is like the 2nd gen Escorts ones, I dont think its a stepper motor. I think its a coil that gets an oscillating signal of about 1 kiloherz; where the duty cycle (but not the voltage) of the oscillation is changed, to move the coil-and-pin back and forth. So in action it is a valve partly open to control the idle, and which is allowed to go mostly shut when you have the throttle open.
    I measured this oscillating signal on my 91 Escort using an oscilloscope.
  4. austin86

    austin86 FEOA Member

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    I have a hand full of these things. Make sure you get one with the right wiring pin out. They changed the plug in the late 80s.
  5. Joey_Twowagons

    Joey_Twowagons FEOA Member

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    For what it's worth, the first generation ones were two piece, and could be partly disassembled, always a good feature for people who like to tinker with their cars..
    [​IMG]


    Here's the interchange from Rockauto. The coverage is odd, in that it is the last year (only) of first generation Escorts and first year only of second:

    FORDAEROSTAR1988-1991
    FORDESCORT1990-1991
    MERCURYTRACER1991
  6. austin86

    austin86 FEOA Member

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    That part is for a ho efi motor. The cfi's had a different part

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