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How the Air Acoustic Control Induction System Works

1213 Views 0 Replies 1 Participant Last post by  speedkar9
Ever wonder what that vacuum actuated thing is at the side of a Toyota 1MZ/3MZ air intake is?

It controls a flap inside, to either disturb/redirect airflow for better mixing and reduction in intake valve noise, or to allow a direct unrestricted path at higher RPM's.

Here's a look at that flap:

Inside the intake plenum where it sits (note all the carbon buildup, especially around the PCV on the bottom:

The flaps don't end there. There's another one in this dual throttle body ES300 intake between the two throttle bodies:

Lesson learned while taking this apart: make sure you clean your car's air intake system, it can get really gummed up!
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