Ford Focus 1.8 Tddi Rpm Problem

[Ford_Focus_owner]

Hello all! :)

I am proud owner of Ford Focus 1.8 TDDI, year 2000.

Ever since I bought it (and previous owner said he had the same problem too) I have a problem with RPM.

At idle, RPM are around 750. When I drive (and it doesnt matter for how long - sometimes after 10 minutes, sometimes after 1 hour) idle RPM slowly raise up to 1200 RPM - I notice this when I`m standing at the traffic lights...

If I stop the car, turn it off and turn it on again idle RPM go to normal for maybe a minute, then they start to raise up again.

I apologise if the topic has been anwsered before but I haven˙t found the anwser yet..

Does anyone know what is the cause of this problem?

And sorry for bad English :)

[artscot79]

Sounds like the idle control valve

[FatHead1979]

Sounds like the idle control valve

+1

[Ford_Focus_owner]

It`s the same problem as here on this video, except it doesnt shake as much as this.

Like I said, previous owner had the problems before and when I bought it, my mechanic completely "cleaned" the sistem including EGR, Bosch pumps and intercooler including turbine...

When it was hooked up on a computer no errors were shown...

Is idle control valve also present on diesel engines? (sorry for stupid question)