Hole in intake

[jrj512]

I took off my intake to clean my IAC with some rubbing alcohol and I found the attached hole that was rubbed by my alternator pulley.

Does anyone know what this box does and if the hole would affect anything, like idle?

[Rogue]

http://en.wikipedia.org/wiki/Helmholtz_resonance

and yes a hole will effect your idle.

[EricJ]

Wouldn't it also cause in issue with the air/fuel ratio as un-metered air is getting in the intake?
Could it also slightly change the temperature of the air, its now coming from behind the radiator rather than by the exhaust header?

[jrj512]

Thanks Rogue and EricJ!

[EricJ]

And unfiltered air i.e. dirt.

[black roadster]

Aftermarket intakes often eliminate the box in their design. Not sure what loss/benefit this has.

[jrj512]

I was able to pick one up from Rogue at Miata Solutions for a nice price. All installed and seems to have fixed my idle issue, or the rubbing alcohol did.