Okay this is for my dads St220. It's developed a strange sound when driving/ letting off throttle.
Sounds like someone blowing over the top of a bottle. Strange I know lol.
No lack of power or anything. Does anyone know of this fault ?
He's changed the air intake pipe return to throttle, possibly thinking it could idle control valve ?

 

has it got a non-standard airbox?

ST`s and cougars do this, nothing you can do from memory?!

 

My cougar would do this its the idle valve ,you could give it a clean but like mine it will just do it at times anyhow and has no poor effect ,just one of them v6 things! ps have a look on the US contour site they did have a cure by using a restrictor or different pipe but I tryed both with mixed results .

 

Thanks for the response, it's a standard air box etc.
He did say he cleaned the idle valve, as it wad sticking and it stopped the sound for a while.

 

The noise will come back, the IACV is faulty and needs replacing. Fitting a longer pipe is a bodge and masks the problem.

 

As above idle control valve.Either replace it or you can clean it but it will come back.It does it on my V6 all the time

 

I had the same on my ST220 and boy did it like to play tunes..
it started when it was left running in the MOT bay superb al round the bay it echo'd
gave the idle control valve a good clean out the stuff coming out was filthy
ever since been fine..
only seen the pipes on the Mk2 mondeos and cougars - some were fitted adn some werent
touch wood mu current 200 is behaving at the moment
sods law says...

 

Im sure there is a modified pipe for these.It is part of the induction pipe

 

Only for the Mk2, the official fix for the Mk3 is replace the valve. If you cleaned it and its stopped, your lucky, but it will eventually fail completely, normally when the weather warms up.

 

Yeah the old man cleaned the valve out but was still making funny sounds lol.
In the end fitted a new valve a pipe.