Engine stops on return to idle (106)

Discussion in 'Peugeot 106' started by David New, Jan 19, 2004.

  1. David New

    David New Guest

    Sometimes in cold weather my engine will start but it won't idle after
    I've used the accelerator. It started doing this last winter and the
    problem has appeared again now it's got colder.

    I believe it has to do with the idle speed stepper motor cutting off
    it's airflow at the wrong time. When the engine is operating normally
    this valve sounds like it is staying open when the accelerator is
    pressed. However, when the engine is misbehaving this valve closes
    when the accelarator is pressed, when the accelarator is released the
    valve doesn't open in time and the engine stops.

    I can get it working again by unplugging the stepper motor plug and
    plugging it back in again. This only works when the engine is running.
    I guess doing this resets the ECU in some way.

    The car is a Peugeot 106 Rallye 98K miles with a Magneti Marreli 8P

    I have measured the output of the coolant temperature sensor, the
    speed sensor and the throttle position sensor and they seem fairy
    sensible. I have recently changed the HT leads and the spark plugs,
    and put some injector cleaner in. The vacuum pipes seem ok. I have
    also sprayed some carb cleaner into one of the idle control air inlets
    but I don't know if it did much.

    Does anybody have any ideas what may be going on?
    David New, Jan 19, 2004
  2. David New

    Simon Guest

    take off the motor and clean it. it may help. £70 new
    Simon, Jan 22, 2004
  3. mine wasn't a Rallye, but had a similar prblem.
    Turned out to be a design fault on some early models, the fuel system cut
    down too quickly, done under waranty by a Pug dealer , there was some sort
    of damper fitted to cure it.
    Andy Clements, Jan 22, 2004
  4. David New

    David New Guest


    That's interesting, maybe it's worth taking it to the dealer.

    Do you know where the damper was fitted? was it an electrical or mechanical part?

    David New, Jan 23, 2004
  5. David New

    Simon Guest

    that is the stepper motor and clean it

    Simon, Jan 23, 2004
  6. David New

    David New Guest


    I've already taken the stepper motor off and it looks clean. I can
    hear the stepper motor working beacause I can hear the rush of air
    through the valve when it opens. Though possibly it isn't working fast

    David New, Jan 24, 2004
  7. David New

    Banjo Guest

    Had the same problem with my 1996 405STI.
    Replacement stepper Idler motor cured the problem.
    Pete Patterson
    Waitakere City
    New Zealand
    Banjo, Jan 26, 2004
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