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Thread: Stalls when hot et al

  1. #61
    Senior Member
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    Rolf Wittwer
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    South Australia
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    Quote Originally Posted by Engenia View Post
    All steppers are open loop. If steps are skipped it can only be corrected at startup when it returns to fully closed, then reverses a fixed number of steps.
    Thanks Errol, I don't know the logic for stepper control but I think you have explained why:
    1/. the idle returns to normal after switch-off during fast idle.
    2/. after a stall on return to idle the engine will sometimes only restart after turning off then on again. It seems the idle mixture is too lean for the engine to fire with the stepper stuck wide open and the throttle closed. It returns to normal when the stepper is reset. It happened as I negotiated a slow Tee junction during my last ride on the Trek and today there was FB post about a dealer struggling to solve it for a TRK 502. If it occurs again on my bike I will give it a fist full of throttle to see what happens.

  2. #62
    Senior Member Engenia's Avatar
    Name
    Errol Kowald
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    27
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    Dec 2006
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    Canberra, ACT, Australia
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    5,563
    Quote Originally Posted by Redbaron57 View Post
    ... today there was FB post about a dealer struggling to solve it for a TRK 502. If it occurs again on my bike I will give it a fist full of throttle to see what happens.
    To solve this problem, dismantle the stepper piston / cylinder and clean both in carby cleaner to remove built up varnish.
    Don't power the stepper while it is apart or it will unscrew itself making it difficult to reassemble.
    Redbaron57 likes this.
    hooroo, Errol www.engenia.com.au [139,200 km - and counting .....]

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