Ford Focus (1998 - 2004) - 99 1.8 Over-revving

Honest John Back Room » Technical matters
View Threaded
Sun 27 Sep 2009 18:51
99 1.8 Over-revving - Ashley1
I'm having a problem with my Focus 1.8. Sometimes it doesn't slow after taking my foot off the accelerator and whilst moving if i put it into neutral, the car will rev on its own (upto 5000rpm) then when breaking only just before the vehicle stops will the revs drop to an idle. Also whilst the car is revving like that in neutral, if i push the clutch down then the revs tend to drop.
I have changed the 'throttle housing' and 'throttle position sensor' but made no difference.
Someone also said it could be the 'idle control valve' which they showed me was situated tucked under the inlet manifold. I don't know what to do cannot afford a visit to the ford dealership.
Should i get a different inlet manifold from the scrap dealers??
Reply | Report as offensive | Link
Sun 27 Sep 2009 20:04
99 1.8 Over-revving - clewsy01
There are lots of topics on this on here, some even by me when i had these problems. I tried everything and in the end couldn't stop it. You can change the idle valve as it made a bit of a difference.

I have read somewhere (think it was on whatcar) that the only way was to change the manifold for this problem, but maybe someone could expand on that. However i would try the IACV as its a known problem. Mine was a fuelpart one at a cost of £40.

You can also try the speed sensor as this is some of its symptoms but not all.
michael


Edited by clewsy01 on 27/09/2009 at 20:05

Reply | Report as offensive | Link
Fri 5 Feb 2010 14:02
99 1.8 Over-revving - willow
Hi, I had a mate who had a similar problem and it turned out to be the speed sensor. When the garage disconnected it, just to prove a point, the problem stopped. When they connected it up again and guess what! Tis worth a look
Reply | Report as offensive | Link