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Thread: adjusting throttle blades

  1. #1
    Join Date
    Sep 2017
    Posts
    9

    Default adjusting throttle blades

    just a quick question.
    Most of the time the car runs well, but occasionally when I slow down at a junction the revs drop to about 300/400 rpm before the IAC catches it (except once when it did stall). The IAC reading is about 13 at idle with a manual transmission.
    Do I need to open or close the throttle blades slightly to cure this problem?

  2. #2
    Join Date
    Jan 2010
    Location
    Brisbane, Australia
    Posts
    869

    Default

    A few questions back:

    What engine? What camshaft? What target idle speed?
    In other words, you can't expect 700 idle speed with a near race camshaft.
    Gary
    Regards

    Gary

  3. #3
    Join Date
    Sep 2017
    Posts
    9

    Default

    I'm running a buick v8 with a stock cam and an idle speed of 850 rpm.

  4. #4
    Join Date
    Jan 2010
    Location
    Brisbane, Australia
    Posts
    869

    Default

    I think the system is too big for your little engine.

    Gary
    Regards

    Gary

  5. #5

    Default

    I would aim for a reading of 10 for your IAC at hot idle, you can go lower go catch the stall. Screwing the blade screw in, will open the throttle blades more so requiring the IAC to open less, hence a lower number. Cycle ignition after changing.

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