Erratic tickover

[Nick61]

Hi
I have a 95 4L chim, from cold for about a minute the tickover fluctuates from 200 to 1200rpm, then it settles down to around 1000, and all is fine.
-I have cleanen the stepper motor.
-Changed it for the one off my brothers chim.
-Disconnected the ECU to reset it.
-fitted new leads, cap & rot arm (one lead was split), no result except now the radio reception is bad.
And still the tickover from cold is all over the place.
Please anyone out there cured this problem ??

[SteShutt]

When mine did this, cleaning the stepper motor fixed it.
I am not very knowledgable about these things, but when I first put it back in the problem remained. I then did it again but this time pushed it so that the stepper bit was fully retracted before putting it back in. (Not very technical I'm afraid.) When cleaning it I had changed it's position, so that it was fully extended. Don't know exactly how the unit works,and if I could create more problems or whether this is totally irrelevant (Ignorance is bliss, until it costs me !) but the idling was then fine. Hopefully somebody more technical can confirm if what I did makes a blind bit of difference.

[marlboro]

The only stepper motor probs I've experienced have been with a hot engine at idle, cutting out.

I'm no mechanic, just putting two and two together. Now you have radio interference trouble. Makes me think you bought unsuppressed leads and/or have a spark plug which is breaking down.

Try changing the plugs or hope Steve Heath joins this thread.

[nick61]

The leads I fitted were Bosch & they have suppresion printed on them. I wonder if there is a preffered routing for the leads from the cap to the RH bank. I routed mine as the previous ones, but steve heaths book does show them routed over the top of everything.

1000k miles ago I (personally) fitted a new camshaft & lifters, everthing had to come off the top of the engine then, but all was well afterwards.

Any other suggestions would be appreciated.

[shpub]

Could be a gummed up butterfly causing an air leak at the throttle which is screwing up everything. Could be the throttle pot or temp sensor or ignition module etc etc etc

[ribol]

Hi
I have a 95 4L chim, from cold for about a minute the tickover fluctuates from 200 to 1200rpm, then it settles down to around 1000, and all is fine.
-I have cleanen the stepper motor.
-Changed it for the one off my brothers chim.
-Disconnected the ECU to reset it.
-fitted new leads, cap & rot arm (one lead was split), no result except now the radio reception is bad.
And still the tickover from cold is all over the place.
Please anyone out there cured this problem ??

You now have suppression problems, have you replaced good leads for inferior ones, adding to your problems? Tried looking under the bonnet in the dark?

Ivan

[nick61]

Are the standard leads Rover ? and are they likely to be superior to Bosch ? But I will have a look in the dark as I will be out in him tomorrow. I will also check the butterfly.

Ta
Nick

[carnutnathan]

I had exactly the same problem with a 95 Chim...had a new stepper motor, about £70 takes 10 mins to fit this seemed to sort the problem out..