Problems with idle-speed

Discussion in 'General Motoring' started by Peugeot Freddy, Oct 27, 2003.

  1. Hello!

    I am running a 106 with a 1.1l engine. Since I diconnected the battery the
    idle-speed went up to 2000 rpm (or so: difficult to say without a
    rpm-o-meter ;)

    I exchanged the motor-management-controller without success: Same
    malfunction. I read in a Repair-handbook, that the idle-speed can't be
    adjusted like in "good old times" ... but there was a Proceedure like the

    If you have a Marelli-Controller: Start the ignition, not the motor - wait
    for 10 sec. and start the Motor: idle-speed is readjusted - good.

    I have a Bosch-Controller: The Handbook tells something like: "Let the Motor
    run with higher RPMs and wait until the Fan switched on twice. Switch of the
    Motor. Switch of all electric devices. Start the ignition, stop the ignition
    (without starting the motor!) Start the motor and let it run 30 secs. (Don't
    push throttle!) Drive 10 (in words: ten) Minutes in upper rpms (between 2500
    and 3500) Stop the vehicle and run 1 Minute in idle-speed. (Don't push the
    throttle!) Switch of the motor: Idle-Speed is readjusted."

    Does anyone have a better Idea how to readjust the idle-speed?

    A car specialist told me, that it might be neccessary to replace the
    throttle-potentiometer, that messures the degree of the given throttle
    (Exchange costs about 300?) This might solve the Problem, but before the
    battery-power-loss everything worked fine! No Potentiometer will fail after
    a Batterypower loss ...


    Peugeot Freddy, Oct 27, 2003
  2. Peugeot Freddy

    steve Guest

    these are normally pretty good concerning idle speed, however an air leak
    will cause high idle speed considerably...check all the vacuum pipes coming
    off the inlet manifold for splits etc.. there may also be an air leak in the
    inlet manifold gasket where it is bolted to the cylinder head....its
    unlikely to be the throttle pot,
    steve, Oct 27, 2003
  3. Hello ...

    What about the calibration of the Throttle-Poti?
    My Computer-Joystick has to be calibrated as well ...

    I read in an Motor-Diagnostic-Controller-Handbook that there is a Menupoint
    on it ... but it wasn't for a Bosch-Motor-Controller. Perhaps I should borow
    such a device to check the Error-Memory.

    Thanks for your reply.

    Peugeot Freddy, Oct 28, 2003
  4. Peugeot Freddy

    SimonDS Guest

    maybe it's a stupid suggestion but have you tried disconnecting the battery
    again? Maybe the ECU has got itself upset.
    SimonDS, Nov 1, 2003
  5. Peugeot Freddy

    r Guest

    I've heard that when you do this, you must touch the (diconnected) leads
    together to reset the ECU. I understood that it discharges all the diodes.
    If this wrong, then I'd like an expert opinion.
    r, Nov 1, 2003
  6. Peugeot Freddy

    miknik Guest

    Diodes don't hold any charge, they control direction of current flow.

    Capacitors hold charge, but you should never discharge a capacitor
    through a dead short as you may damage it.

    Lettuce spray for whirled peas...

    Reply to usenet[at]miknik[dot]co[dot]uk
    My pug -
    miknik, Nov 2, 2003
  7. Peugeot Freddy

    SimonDS Guest

    leave the battery disconnected about 3 hrs to reset ECU
    so i was told


    SimonDS, Nov 4, 2003
  8. Hello ...
    thank you for your comments,
    Actually I disconnected the battery ... but only for a few seconds. I'll
    disconnect the battery for this night and see what happens. Tomorrow is the
    appointment with the engineer/expert. They'll have to fix it if neccessary.

    Actually I tried another ECU and the first seconds were possitive. But after
    a while the idle-speed ran up again. That one was unplugged for several

    Possibly there is a problem with one temperature-sensor: The idle-speed of a
    warm motor is steadily rising and falling.
    But there might be as well a leak in an air tube.

    I hope that my car is going to be fixed tomorrow ...

    Bye Freddy

    ----- Original Message -----
    From: "SimonDS" <>
    Sent: Tuesday, November 04, 2003 7:02 PM
    Subject: Re: Problems with idle-speed

    Peugeot Freddy, Nov 12, 2003
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