Mazda MPV Air Filter Box noise

whitempv

Hi, Does anyone here had any experience with a noise coming from the air filter box, looks like the noise is only when the air temp. is below 40F. and when is below 2000 rpm.
I can not explain what type of noise that is, maybe like when you turn on a house vacuum.
Any ideas??/
Thank You

subearu

IAC valve, an easy DIY replacement on '00-'01. The noise is commonly referred to "foghorn" but can vary and sound different to some.

-Brian

whitempv

Tha's exactly how it sounds, even my neighbor told me that it sounds like an old horn.
Do you know the exact location on this specific car?... I can only find the Map sensor and the Mass air flor sensor.
Thank you,

subearu

i'd have to google it, I just know from reading mpvclub that the foghorn noise = bad IAC

-Brian

whitempv

Thanks, I found a video in you tube....
thanks for the info....helped me a lot.

bknydiy

yes mine does that too,when its cold and i start it up if i put it in gear it starts honing sound,when its warm it doesn,t.