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Old 11-14-2012, 04:53 AM
G. P. Burdell's Avatar
G. P. Burdell G. P. Burdell is offline
Rambling Wreck
Location: Southeastern U.S.
 
Join Date: Jan 2006
Posts: 1,766
Mein Auto: E46
It appears to be the vacuum tube that opens the check valve to allow air from the secondary air pump into the exhaust headers. If that's the case, then you might get a Service Engine Soon light and find a stored fault code related to insufficient secondary air flow.
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