Weird throttle related sound with video. Help me out here guys!

[Yiannis197]

It really does my head in, doesn't affect the car's drivability or performance whatsoever, it's there only when the car is cold and disappears after 5 minutes or so. I'm talking about that beep that ''presents'' itself after pressing the throttle and it lasts less than a second. Very obvious in the video that follows.

https://www.youtube.com/watch?v=FePmZNIeuNk

What do you think?

Cheers

 

[Foxspeed]

that's probably the pcv valve on the side of the inlet manifold.....(the small round plastic housing with the breather pipe on)

 

[Yiannis197]

Thanks foxspeed. Is there something for me to do to make it stop whinging when cold? Is it trying to tell me something?

 

[ryan197]

Could probably remove it and give it a clean as it does get oily in there

 

[Yiannis197]

Thanks Ryan, I'll give it a go (hopefully I'll figure out how to take it apart) and report back

 

[Yiannis197]

Ok I had a mate pressing the throttle while I was trying to figure out where this sound is coming from and I'm 95% that it's coming from the pcv valve. I did remove it but I didn't know how/with what products to clean it, can't take it apart really so any ideas?

Are these expensive to buy new? I wouldn't mine replacing it if it's not crazy money..

 

[ryan197]

I managed to get mine off, and from what i remember, it can be prized apart, i used wynns carb cleaner, dissolves oil great

 

[Yiannis197]

Thanks Ryan, I'll have a go myself.

 

[Yiannis197]

Yeap, it was that breather valve after the throttle body. The o-rings had gone slightly and they allowed a bit of air to pass through hence the beeping sound when cold, I believe the seals would expand when warm that's why it'd shut up. The part new costs £40 posted but I only replaced the o-rings and job is a good one.

 

[ryan197]

They do draw abit of oil into the plenum, i was planning on fitting a oil catch tank but never got round to fitting it.

 

[Yiannis197]

You are right Ryan, they do draw oil inside there. I only realised when I took my tb off for cleaning and I was shocked of how much oil was in there.

After that an oil catch tank was on order, only recently fitted

 

[Siso]

Yannis could you please take a photo of that part (pcv valve) ? I dont know what do you mean but mine sound the same today when it was cold so i want to fix it too. Thanks

 

[ryan197]

Its to the left of the throttle body, round black plastic thing with a pipe connected to it, cant miss it.

 

[Siso]

this one ? so, remove it (is it going light to remove ? ) and clean from oil and take it back ? nothing more ?

 

[Foxspeed]

this one ? so, remove it (is it going light to remove ? ) and clean from oil and take it back ? nothing more ?

that's the one

 

[Yiannis197]

Yes that's the one mate (thanks foxy).

What I did was to change the o-rings really. I got a 225pc set from ebay (£5) and they did the job.

Just for reference this part costs £40 posted.

 

[Siso]

and what function got the pcv valve ? what is it doing ? a saw a engine of Praga R1 which got our f4rt clio engine and they got remove it and plug the hole.

 

[ryan197]

Breather/ fume vapour recirculation i guesse

 

[Siso]

View attachment 8179 there is a photo

 

[Yiannis197]

The oil fumes are directed from the cam cover back to the induction to get burned, these can't be vented in the air for environmental reasons.