306 Stepper motor clean

Discussion in 'Peugeot 306' started by M, May 18, 2004.

  1. M

    M Guest

    Hi all,

    I read a post a while ago that recommened some clean their stepper
    motor. I have a 306 1996 XSI (108,000m) with problems of the car
    cutting out when idleing and rev's going up and down. I have located
    the motor but which part of the stepper motor do I clean and how?

    Many thanks

    M, May 18, 2004
  2. M

    Nigel Guest

    I use aerosol brake cleaner. Make sure the ignition is off and remove
    the stepper motor (small torx screws,and can be tight). spray the
    cleaner over the piston and allow to dry. Also spray into where the
    piston goes, but not too much. Put the stepper motor back. Start the
    car and rev it to 3000 for 10 to 15 seconds, just to clear the cleaner
    out. Now allow to idle. If it stalls, or idles too high, it needs to
    be initialised.
    Switch off the engine, switch on the ignition, then off for 10
    seconds, then on for 10 seconds then off. Now start and see how it
    idles. If necessary repeat the operation. If it is still messing
    about, switch off and disconnect the battery, then the ECU and leave
    disconnected for a minute (make sure you have your radio code!!). then
    reconnect the ECU, then the battery, then repeat the initialising
    operation again. That will hopefully do it. If not then you need a new
    stepper motor.
    Nigel, May 19, 2004
  3. M

    Bob Minchin Guest

    Nigel, Does this method generally hold true for other models?
    I have a 94M plate 1.8i 405 which very occasionally decides to idle at
    1800-2000 rpm by the time i get a chance to examine it, the problem goes


    Bob Minchin, May 19, 2004
  4. M

    Nigel Guest

    Well, I think this model has an idle valve which is located adjacent
    to the distributor/coil pack. You can take it off, and use brake
    cleaner, and use a small screwdriver and GENTLY make sure the valve
    rotates inside. You do not need to initialise it. Just start the
    engine and rev it to 3000 to clear the cleaner, and that should do it.
    Nigel, May 19, 2004
  5. M

    Curious Guest

    I have the same complaints as the OP. But the (garage)diagnosis says that
    "ignition system has been permanently damaged" and will cost a new ECU.
    Cleaning of the steppermotor has not mentioned as a solution. What I do not
    understand in OP's story is why he thinks its only a matter of some
    cleaning? And what contamination will cause a change of the idle revolutions
    now and then? Is the petrol not pure enough? But I am willing to try
    everything to avoid the replacement of the ECU, therefore I should like to
    clean the steppermotor .But Nigel mentioned the resetting of the ECU by
    disconnecting the plug from the ECU. I tried this, but I could'nt take off
    that plug....
    Curious, May 20, 2004
  6. M

    Bob Minchin Guest

    Nigel wrote in message ...
    Thanks Nigel.
    The valve is pretty obvious alongside the rocker box. Not sure if it is a
    stepper motor type (bosch motronic 5.1 ECU). I lookout for some of this
    brake cleaner and give that a try. Presumably WD40 is the wrong stuff to
    use? as I have some already.


    Bob Minchin, May 20, 2004
  7. M

    Nigel Guest

    NO don't use WD40 as it will leave a deposit in the valve. You need a
    solvent which will clean and then evaporate away. Brake cleaner is
    ideal and only costs a quid from a Peugeot dealer. Or should do.
    Halfords sell it too.
    Nigel, May 20, 2004
  8. M

    Yuting Wan Guest

    I've done the step motor cleaning on my 306 XT 1.8. the unit is just
    opprosit the radiator held by two trox bolts. Never use WD40 as it will
    become sticky after it exposes to heat. I used caburator cleaner for
    cleaning and some high-temp oil to lubricate it. There is rotor like part
    inside was turning rough before cleaning and lubricating. After make it turn
    smoothly the rough idle has gone.
    Yuting Wan, May 21, 2004
  9. M

    M Guest

    Hi Nigel,

    Many thanks for you're detailed response. I'll get some brake cleaner
    over the weekend and give it a go. You mentined about a piston

    spray the
    Where abouts is this piston? Inside the hole where the motor came out
    from? Does the motor have a cog on the end of it?

    Many thanks once again!!

    M, May 21, 2004
  10. M

    Nigel Guest

    Well, I call it a piston, but it is probably called something else!
    It's part of the stepper motor, and you will see it when you remove
    it--the shiny thing on the end. At least it SHOULD be shiny. It is
    probably carboned up. Give it a good clean with brake cleaner or carb
    cleaner, as Yuting Wan said. Please do not be tempted to connect it up
    and turn the ignition on to make the piston come out further. It may
    come all the way out and you may have a hell of a job getting it back
    Nigel, May 21, 2004
  11. M

    M Guest

    Hi Nigel,

    Just to let you know that I took out the stepper motor sprayed carb
    cleaner in it and clean the end of the motor and now all of my
    problems have been sorted. The car will idle fine and allow me to put
    it in 1st gear release the clutch and the car will drive it's self
    fine, before it would bulk and try to cut out etc.

    Many thanks for you're help you've saved me about £100 if I took it to
    a garage!!!!


    M, May 22, 2004
  12. M

    Nigel Guest

    No probs. Glad I could help.
    Nigel, May 22, 2004
Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.