Throttle body spacer whistle
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The air along the outer edges of the air intake system and throttle body hits the "wall" of the smaller intake manifold, creating turbulence that can cause a noticeable whistle. Other trouble areas can be the small vacuum ports and the IAC (Idle Air Control) valve port which may empty into the main bore of the throttle body.. OBX Throttle Body Spacer. Jump to Latest Follow 1 -.