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IAC Question - little black cap...

Joined
April 1, 2007
Messages
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City, State
Halifax, Nova Scotia (Posted to Edmonton, AB for now)
Year, Model & Trim Level
1997 Explorer XLT
I was getting a sound out of my Ait Filter Housing that sounded like a street cleaning vacuum truck after I cleaned my MAS & IAC. After taking one part of the filter assembly off at a time I finally traced it to the Plenum. I reached up and plucked off the little black cap on the IAC = sound is gone.

My question is, what is this cap for and it is important to have it on? Or, if it is important, can I just put a piece of vacuum hose on it with a small filter - or something like that.

Thanks, Roger

1997 Explorer XLT 4.0L 5 Speed Manual.
 












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