Intermittent Misfire | Ford Escort Owners Association (FEOA)
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Intermittent Misfire

Discussion in '2nd Gen 1991-1996 1.9L SOHC' started by MemnochtheDevil, Sep 10, 2020.

  1. MemnochtheDevil

    MemnochtheDevil FEOA Member

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    Old OBD1. Engine misfires, worse under load. Only code was 159 for MAF sensor, which I've replaced. Issue persists. Odd thing is when it misfires, the tach needle will pulse upward.No arcing in coil or wires, plugs are all clean and gapped properly.

    Any thoughts? Thanks in advance.
    Last edited: Sep 10, 2020
  2. Swift

    Swift FEOA Donator

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    How old are the plugs and wires though?
  3. marclar

    marclar Administrator Staff Member

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    i would be checking battery connections and ground integrity first.
  4. MemnochtheDevil

    MemnochtheDevil FEOA Member

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    Times like this make me actually wish this thing was OBDII so that it would zero in to the issue by itself. KOEO and KOER codes are 111. Power balance test is perfect. I'm about to follow the pinpoint tests in the "H" book for the year 1993. Short of that, just randomly replacing ignition parts starting with the plugs and hoping for the best. No sign of arcing anywhere. I'm pondering if I could be having another PCM starting to go away. Wouldn't be the first time. The weirdest symptom with the misfire is that every time it occurs the tach needle bounces UP instead of down like you'd expect on a misfire.
  5. marclar

    marclar Administrator Staff Member

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    un-ford-tiounately, even if it was obd2 there is a good chance it wouldnt code either. ford likes to make everything as difficult as possible. even ford trucks missing spark plugs wont throw a misfire code..

    if you have verified the grounds and such are good, i would start with secondary ignition components.. plugs, wires, check the bottom of the coil for cracks. sometimes the radio noise capacitor will go bad and cause excessive noise in the tach signal. the tach signal comes directly from the edis and is a completely dedicated circuit to the cluster/gauge its self.

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