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Thread: Surging idle on a stock 5.0

  1. #1
    Club Member Anthony's Avatar
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    Default Surging idle on a stock 5.0

    1986 was the year

    5.0 was the ride

    Now in 2018. The idle is surging


    Stock 86 AOD mustang

    Sometimes it don’t want to start cold. Then does.
    Idles ok then surges and dies.
    Sometimes it idles ok for 10min then starts surging and will die

    TPS was @.007
    Set it to .98/.99

    Idled fine for 5-10 min then started surging again

    Pulled iac, looked clean, sprayed it out anyway. Pulled the end off. Plunger was not stuck.
    Ohm across the iac was 9.1.... I read that’s good

    Each tab to the body should be 10k ohm but I’m getting OL

    I read that is ok too

    What’s next???

    I have battery disconnected now, going to “reset” the idle rpm

  2. #2
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    Had an 86 GT vert back in the day. Did kinda the same, bad FPR, through a gauge on the schrader valve.

  3. #3
    Club Member Anthony's Avatar
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    Looking for that adapter locally

    No one has that shit anymore

  4. #4
    Club Member Beigg's Avatar
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    Fluid systems engineering on 14 mile in clinton twp might be able to source it.

  5. #5
    Forum Member BrainFearGone's Avatar
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    What adapter are you looking for exactly? I might have something.

  6. #6
    Club Member Anthony's Avatar
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    It’s the fuel rail adapter

    1/16 to 1/8 pipe I believe

  7. #7
    Forum Member BrainFearGone's Avatar
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    Been a long time but thought I might have something in the junk drawer but no luck.

  8. #8
    Club Member mikesfastss's Avatar
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    I’ll check mine tonight when I get home, if I have it I’ll text you and we can meet up tomorrow or something.

  9. #9
    Club Member Anthony's Avatar
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    Quote Originally Posted by BrainFearGone View Post
    Been a long time but thought I might have something in the junk drawer but no luck.
    Thanks for checking!

  10. #10
    Club Member Anthony's Avatar
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    Quote Originally Posted by mikesfastss View Post
    I’ll check mine tonight when I get home, if I have it I’ll text you and we can meet up tomorrow or something.
    My man!

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