Noise from airbox area

[bbeechsho]

I am having a noise, sorta harmonic or a humming type noise, coming from my airbox. Now I haven't really tried to get into it, but if I pinch the hose coming from the airbox to the engine, it stops. Can anyone let me know what this is, cause I know I am not the first person this has happened to. Thanks in advance people. ~Beech wink

 

[twr]

I think it has something to do with the IAB or the EGR system. I was working on an ATX SHO that did the same thing after the EGR system was mucked out (cleaned) IIRC when I cleaned the IAB it stopped.

 

[sdpatt]

It is an acoustic resonance that can show if the stock intact tract is modified. The stock setup should not exhibit this problem.

 

[SHOtimer]

Mine did that. I had to replace the IAB for different reasons and it went away.
Doug

 

[stevetatro]

Mine did the same thing, and my intake tract was 100% original.

I replaced the IAB (for other reasons) and this sound has not occurred since.

Good luck.