i have an n-reg 1.8si and last year i replaced the idle control valve which sits under the inlet manifold as there was an idling problem which was cured by this! Now i have a similar problem where if you pull up to a halt or even if you just blip the throttle it holds rev at 2000rpm and will fluctuate between 1800rpm then back to 2000rpm, i tried speaking to ford technical but no help. anyone got any ideas? i have been told to replace the throttle body with a 2 litre one from a mondeo and new t.p.s sensor as this may cure the problem.......its doin my head in aswell as the missus as she uses the car more than i do!!!

 

I know you changed the idle control valve last year but they do get blocked quite easy. Just take it of give it a clean and what i do it get a small screw driver and move the spring inside carefully and spray Wd40 and that lubricates all inside to stop it sticking. Also reset the ecu afterwards if not it will still be the same. Ive had my GTi 2 and half years and ive had to clean mine 3 times.

Changing to 2ltr maf and tb would not make no differene to that.
Hope this helps bud

 

You Say Reset The Ecu how do you do this?

 

I think there is a couple of ways but the way i no and do is simply take of the negative battery terminal for about an hour and then re-connect and away you go. Always works for me. I always take it of once the car is of the ground or on ramps saves abit of time.

Hope this helps buddy