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Thread: Odd huckabuck recorded in log

  1. #1
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    Odd huckabuck recorded in log

    Ever since the latest combo (10 years ago?) my SC has had an odd huckabuck that it does usually soon after startup. It will fire, everything is ok, you go off driving and just a few miles away the car will start to jerk. Not too violently, but just a quick stuttering where it won't respond to anything. You give it more throttle and it doesn't go away. The annoying thing is that you can't accelerate. It happened on the interstate one time and I had to throw the clutch in at 75 and coast down to 45 before it finally went away. Then the car is normal again. Its super annoying, but finally recorded it in a log.

    Its all the noise from 187 to 192. Green is rpm, pink is spark, purple is tps, brown is mph, blue is maf voltage. I'm leaning toward TPS spazzing out since it otherwise seems smooth until that point. And I'm sure as hell not hitting the throttle that rapidly. Just odd that it seems to occur so consistently after startup.

    Micah
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  2. #2
    Join Date
    Dec 2007
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    Salem OR
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    Might be rooted in a shared (?) supply voltage having it's own issues, and those signal traces are just symptoms?

    See https://easyautodiagnostics.com/ford...nostic-tests-1
    Last edited by KMT; 06-01-2020 at 11:42 PM.

  3. #3
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    Email me the log. [email protected]
    ~Chris
    SCCoA Member #1826
    Bettie Riding jack stands
    SCARlit on drag duty now

  4. #4
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    Quote Originally Posted by BLOWN38 View Post
    Email me the log. [email protected]
    Ok I'll send it later. Its a half hour long though.

    Micah

  5. #5
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    Micah,

    You were actually driving your car recently ?

    David
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat.............10.597 @ 135.78

    My Garage

  6. #6
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    Yeah I fired it up for the first time in awhile the other day.


  7. #7
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    I see the problem....





















    The dash is lit up like a christmas tree and there's no boost!
    ~Chris
    SCCoA Member #1826
    Bettie Riding jack stands
    SCARlit on drag duty now

  8. #8
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    Bahhh, none of those lights are important.

  9. #9
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    Quote Originally Posted by Micahdogg View Post
    Yeah I fired it up for the first time in awhile the other day.


    Micah,

    Sounds just like I remembered.

    I thought Dave D fixed the Huckabuck thing during Hot Rod power tour ??

    David
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat.............10.597 @ 135.78

    My Garage

  10. #10
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    No that was another issue. My car runs on the cold side and that morning it was a bit crisp out, I hopped right on the interstate, cruising at low rpm, and I never got the ECT's high enough to switch out of open loop. So I was running rich until the point of fouling plugs. I think all Dave did was lower the threshold for coolant temp so it will switch to closed loop easier. Apparently all I had to do was hammer the throttle and get the car warmed up more, but I was driving like a granny that morning.

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