Whats the piece sponge for?

upnorth · Unread post by **upnorth** » 09 Jun 2019, 21:30

About to do my first service on my 308 (130/1.2 Puretech) - haven't pulled the car to bits yet so it might be obvious when I have - this is in anticipation...
Where does the piece of sponge fit? (or is it for mopping your brow after having to remove half the car to get the air filter in?

)

GiveMeABreak · Unread post by **GiveMeABreak** » 09 Jun 2019, 23:24

It definitely seems part of the filter, so don't chuck it away just yet!

Unread post by **moizeau** » 10 Jun 2019, 07:24

Looks like a pre-filter, though I've never seen one in the flesh.

Hell Razor5543 · Unread post by **Hell Razor5543** » 10 Jun 2019, 07:27

I have had, on a few occasions, ait filters with sponge stuck onto them.

Unread post by **Skull** » 10 Jun 2019, 15:48

Maybe just a support

MikeT · Unread post by **MikeT** » 10 Jun 2019, 17:19

For the crankcase breather perhaps?

Unread post by **bobins** » 12 Jun 2019, 17:48

I'd guess it's a pre-filter. The genuine air filters for the C5 X7 have 'sponge' bonded to the face of the filter material - this can help to extend the service life of the air filters as it filters out more coarse material. I'd suspect there's a place in the air filter housing for that sponge in your photo to fit.

admiral51 · Unread post by **admiral51** » 12 Jun 2019, 18:10

Maybe a manufacturing cock up and cheaper to produce a bit of foam than redo the housing

white exec · Unread post by **white exec** » 12 Jun 2019, 19:37

Something to damp an unwanted vibration??

Maybe someone could ask next time they go into a PSA service centre...

Unread post by **moizeau** » 12 Jun 2019, 19:53

And the riddle goes around and around.....

upnorth · Unread post by **upnorth** » 29 Jun 2019, 16:49

Sorry about the delay guys, got round to doing the service last weekend

Here it is in-situ

Removed

Comparison:

The car has obviously been serviced prior to me getting my hands on it so looking at how much the sponge is deformed, the fit of it and the shape of the new one, I'm not all that convinced that it's in the correct position in the first picture - I just don't know; I couldn't see anywhere obvious it would fit and needless to say I rammed this one back where the old one came out of!

white exec · Unread post by **white exec** » 29 Jun 2019, 17:33

Does it actually do anything in that hole, or just fill up a cavity? Would any air pass through it?

upnorth · Unread post by **upnorth** » 30 Jun 2019, 13:34

Yes there's an outlet from the airbox that goes to some kind of electronically controlled valve/sensor on what I assume is the intercooler pipe:

white exec · Unread post by **white exec** » 30 Jun 2019, 16:48

Aha!

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Whats the piece sponge for?

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