NYCA8L

i removed the cove by the front of the engine and noticed 2 little rubber "bubbles" is the best i can describe it and attached to them are these plactic arms one of my plastice pieces is broken so the bubble doesnt work can you guys help me out to identify it .

the green the plastic piece is whole and the red is broken. does any one know what its for or where to buy a replacement.

jakematic

Intake actuator arms.

Gruven makes a billet replacement.

See also https://www.audiworld.com/forums/sho...ghlight=gruven

MP4.2+6.0

at least I have come to believe that these things breaking are more a "symptom" than the underlying issue. I posted on that some months back. If the internal air regulating plates inside the manifold that are moved by these arms start to freeze up at the front and rear seals, these arms in turn are prone to break. There is a thread/link to a whole procedure to extract those seals/bearings and free things up, but at least in my case with a C5 4.2 it proved impossible. That leads to replacing the whole manifold--junkyard is around $300, but for my C5 they were unobtainium anywhere in the US or Europe, and the dealer price is over a grand and you have to buy the entire manifold with this assembly included.

Net, replace the arms but also check the movement of the two intake components driven by them. Use Liquid Wrench or some similar penetrant as best you can on the front. Nothing to be done for the rear area, and unfortunately the failure is apparently actually more from the inside, where the PCV oil vapor feed makes a nasty chemical soup of water and oil vapor in the manifold w/ each cold start.

NYCA8L

DEAR AUDI WORLD PEOPLE I LOVE THIS FORUM THANKS FOR THE HELP CLEARED IT ALL UP FOR ME THIS SITE / FAMILY IS AMAZING

dvs_dave

You might want to try running some intake cleaner through it like seafoam or similar. Should help break up some of the gunk that causes the sticky intake flaps which is the underlying issue.

NYCA8L

just ordered a new set of Gruven ones. Getting it Saturday hopefully cant wait to see the difference just hoping that its not stuck and just a broken plastic.

jakematic

If I remember correctly, you should be able to manually move the arms easily.
May not be a bad idea to manipulate them to free them up some just in case.

mishar

+1 what Jake said.

You should notice a bit more power at low rpm's (below ~4500).

MP4.2+6.0

If they can't be moved, it's a waste of time and money until freed up. Been there as I posted before...

2001 S8

Hey NYCA8L,

Unfortunately in the D2 world this is a popular topic/issue. See link below to for additional information and help.

https://www.audiworld.com/forums/sho....php?t=2765556

Good luck.