What is this pipe? Loud sucking noise?

M@r]{ · February 20, 2005, 01:41:49 PM

When the car starts to boost up I get this very loud sucking noise from the drives side of the engine bay, also only able to boost upto about 0.4 bar. It wasnt like this before. So im thinking a pipe has come off somewhere. Having a look I found two pipes that just vent off to air. Picture attached: Any ideas? I thought it was the first one and put a bung in it, but it didnt make difference. I also have a hoprrible thought it my be the dump valve sticking open? Any thoughts on that?

M@r]{ · February 20, 2005, 01:42:39 PM

close up...

M@r]{ · February 20, 2005, 01:43:42 PM

then also notice this.....

clive · February 20, 2005, 02:04:42 PM

Hi Mark.

The pipe you are showing was where the air pump was connected
the other one being open will just make it Psssshhhh as you change gear.

So if the car has been running around like this then the most common fault for the noise you are describeing would be that the big plastic pipe under the air pump pipe has lifted and pulled off the manifold.

M@r]{ · February 20, 2005, 02:08:24 PM

so should the be blocked off or anything? I just dont remember the one in the first two pictures being like that, wondered if a bung had come out?

So would this affect the boost not coming up?

clive · February 20, 2005, 02:40:26 PM

Yes it should be blanked ( the rubber pipe) normaly when the air pump is removed that pipe is disconected behind the manifold with an aloy plate, but perhaps someone just bunged yours off

( block it off and see what you get)

Hope this helps

M@r]{ · February 20, 2005, 02:42:46 PM

I did block it off but it made no difference to my problem. I took it off as it obviously wasnt the cause and I was worried it may cause damage if it wasnt supposed to be blocked

QuoteOriginally posted by clive
Yes it should be blanked ( the rubber pipe) normaly when the air pump is removed that pipe is disconected behind the manifold with an aloy plate, but perhaps someone just bunged yours off

( block it off and see what you get)

Hope this helps

mikeeech · February 20, 2005, 05:24:33 PM

Try checking the large pipe from the turbo to the air cleaner (circled below). the clip looks to have pulled off.

M@r]{ · February 20, 2005, 05:30:00 PM

thats the one that leads to the airfilter / cone filter isnt it?

QuoteOriginally posted by mikeeech
Try checking the large pipe from the turbo to the air cleaner (circled below). the clip looks to have pulled off.