306 Stepper motor clean

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

Matt

 

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, 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
away.

TIA

Bob

 

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.

 

I have the same complaints as the OP. But the (garage)diagnosis says that
the
"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....

 

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.

regards

Bob

 

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.

 

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.
Y.W.

 

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!!


Matt

 

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
in.

 

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!!!!

Cheers

Matt

 

No probs. Glad I could help.