R34 Rb25de NEO loud hiss

[Rychard]

R34 Rb25de NEO loud hiss

So recently when under the hood I noticed a noticeable hissing sound coming from my CAI (Cold air intake) it is not directly from the intake more towards the throttle body. After playing around with the AAC and TPS for a while checking for vacuum leaks I couldn't find anything to solve the sound, Finally I found that when adjusting the idle screw on the AAC/Throttle body the sound would increase/decrease relative to the opening or closing of the screw/valve. Not sure where to go from at this point?

Edited September 3, 2016 by Rychard

[ADM33T]

Following !

Similar thing happening to my R33 S2.

Directly around the TB.

Haven't played around with the idle screw but when under acceleration the "hissing" noise disappears.