David Hearn wrote:
> Tim.. wrote:
>> "David Hearn" <dave@[EMAIL PROTECTED]
> wrote in message
>> news:6209p2F20rovqU1@[EMAIL PROTECTED]
>>> Our Peugeot 306 1.4l petrol, 1998 version has just started (as in
>>> today) idling quite lumpy once started - such that you feel it's
>>> going to stall (or at least, can imagine that it might).
>>>
>>> It's just passed 120,000, so is getting longer in the tooth. Had
>>> it's MOT done last October and passed emmisions fine. Engine wise
>>> it's been okay. Slight oil leakage from the head gasket area (front
>>> left side) pretty much the entire time we've had it (6 years) - but
>>> not enough to cause us to have to top up much between oil changes,
>>> some tapping from the cam shaft (again, pretty much the whole time).
>>> No issues though with the running of the engine, starts immediately
>>> first time every time. Coolant has been okay-ish. No noticable mayo
>>> - but the coolant has always looked a bit rusty between changes, and
>>> is probably due for a change.
>>>
>>> Plugs were changed last year, and we do about 10,000 miles per year.
>>> Oil change done about 6k miles ago. Earth strap replaced a year or
>>> so ago when it failed (causing weird electrical issues) - but haven't
>>> checked this time.
>>>
>>> One other thing, which I wonder may be related, is that recently
>>> (last couple of weeks) the trip counter has been resetting on its
>>> own. I reset it each time I fill the tank and so noticed when, after
>>> half a tank of fuel has been used, it's suddenly reading only a
>>> couple of miles.
>>>
>>> Just now, when the car was very lumpy, it seemed that whenever we
>>> pulled away from a junction, particuarly when changing up gears, it
>>> seemed to reset - we saw this happen a few times. Since then though,
>>> we've done about 15 miles without it resetting, even though we've had
>>> to stop the engine for a bit, and when re-started it was lumpy
>>> again. Might be a red-herring - but might be helpful. I'm wondering
>>> if it's an electrical problem (coil pack?) causing the trip counter
>>> to reset - which may also affect the ignition - but I've got no real
>>> idea of *why* it might cause it! Just a wild hypothesis.
>>>
>>> There's no engine lights or anything else showing.
>>>
>>
>> This is a single pointer n'est pas? If so, its waaaay past having the
>> injector cleaned / replaced.
>
> I've no idea whether it's single or multi point. The symptoms appear
> immediately after starting the engine, even when warm. After driving a
> couple of miles I don't notice any stuttering in the idling. I tried it
> at some lights yesterday after driving for a bit, immediately after
> restarting it was lumpy again.
>
> I also noticed yesterday that it has started idling quite fast on
> occasions - not all the time and went for a bit after stopping and
> restarting the engine (but got the stuttering/lumpyness again). No idea
> of the actual RPM as my rev counter has no dial (the speedo motor died a
> while back and I swapped motors to get a working speedo - cheaper than
> £400 for a new instrument cluster from Peugeot).
>
>>
>> Otherwise check the stepper motor and linkage for dryness / stiffness.
>>
>> Tim.
>
> Where's the stepper motor, and how would I check it? ;)
>
> D
Highly likely to be the Idle control valve/stepper motor sticking. I
read of these only having 50k miles life. (my 405 ICV is playing up at
88k miles)
Look for an electrically controlled valve with hoses in and out
effectively bypassing the throttle butterfly. Sometimes these can be
cleaned with carb cleaner and last a little longer.
New ones (for my 405) are about £50 from GSF and double that from Pug.
Not all ICVs are true stepper motors. Mine is a DC motor with two
windings (three terminals) which by varying the current in the two coils
can turn the armature though 90 degrees, enough to operate a valve
between fully closed and fully open.
hth
Bob
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