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[3.2 paisley wagon]

on the plenum you have the breather part  where the four breather pipes attatch. I have noticed a hissing noise comming from under the black part marked eco tech.  Whats under there and is there any serviceable parts ie orings etc.

[Darth Loo-knee]

Yes there is a sort of turret which has a rubber o ring 

[markfree]

Yes .............. see http://www.omegaowners.com/forum/YaBB.pl?num=1285583967

[Entwood]

Right in the "middle" of the long part is a fancy shaped o-ring type thing ... has a bar across the middle as well. On the part that drops into the larghish hole... If not replaced when the black part is taken off they have a tendency to go brittle and break ..

Easily got from the dealers. If you've not taken it off before, the black bit with "Ecotec " on it unclips from along the sides, do NOT force it or you will break the bit underneath. Once unclipped you will see the screws that hold the main part on.

[3.2 paisley wagon]

Thanks chaps.  I take it if this is leaking air it will be the cause of not just the hissing but the slight rough idle?

[davethediver]

It won't help if it was meant to leak air it always would have done

[Entwood]

Thanks chaps.  I take it if this is leaking air it will be the cause of not just the hissing but the slight rough idle?

Ohhh yes ......  (picture a dog nodding ..   )

[3.2 paisley wagon]

thanks Entwood, will order a new oring tomorrow!

[Darth Loo-knee]

thanks Entwood, will order a new oring tomorrow!

Put a slither of grease or vaseline  () around the O ring when you fit it

[dbug]

thanks Entwood, will order a new oring tomorrow!

Put a slither of grease or vaseline  () around the O ring when you fit it

Yep sound advice - grease it well