Is this the ICV?

kedw200 · Post by **kedw200** » Tue Jan 11, 2011 12:57 pm

A while ago (before my car had a rev counter) I noticed that when warm (and often on damp days?) the car would judder when I put the clutch down at junctions. I now have a rev counter and when taking the car for a drive last night- which was damp- I realised the reason for the judder.

Basically, when the clutch is pressed, instead of dropping to about 800-900RPM for normal idle, the revs drop as low as about 500 for 2/3 seconds, then slowly rise to the normal idle speed. Pulled up in a car park and revved the engine in neutral, the revs drop to about 700 (judder) then rise to idle.

From what I've read, I believe this could be the Idle Control Valve. I've heard about cleaning but wondered, how much is a new one? If they're cheap I might just pop a new one in, if not I'll just clean it (if it's the problem!).

When the car is started from warm a similar thing happens as well, instead of shooting up to idle when the engine starts, the revs go upto 500 then slowly upto idle. that's if I don't give it a rev to 2000 to start it on it's way.

Any help would be appreciated.

PK

UrbanDenim · Post by **UrbanDenim** » Tue Jan 11, 2011 4:30 pm

Sounds like the ICV as its happening just as the car idles after revving. but it could just need a good service.. plugs/filters/oil etc. If you let me know what engine you have i might be able to give you a rough price.

duncanpound · Post by **duncanpound** » Fri Jan 14, 2011 11:11 am

could also be the maf

kedw200 · Post by **kedw200** » Fri Jan 14, 2011 2:23 pm

Would diagnostics give me any decent idea of a problem? I can get it connected to a machine for nothing

duncanpound · Post by **duncanpound** » Fri Jan 14, 2011 3:54 pm

yes if the engine management light comes on

kedw200 · Post by **kedw200** » Sat Jan 15, 2011 1:25 am

It doesn't :/ btw, dials working great, cheers

duncanpound · Post by **duncanpound** » Sat Jan 15, 2011 11:49 am

ahhh sound

does the engine management light come on when you turn the ignition on?

kedw200 · Post by **kedw200** » Mon Jan 17, 2011 1:32 pm

When all the other lights (oil, battery, etc) do, it comes on, but goes out soon as the engine's started. Thought that was normal?

duncanpound · Post by **duncanpound** » Mon Jan 17, 2011 2:25 pm

yh thats normal mate

kedw200 · Post by **kedw200** » Tue Jan 18, 2011 4:16 pm

Cool, in that case nothing to report. Drove again yesterday and it seemed fine, weather seems to make it worse :S Damper it is, more it does it...

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Is this the ICV?

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