howling noise from air box - 99 4.0L 4X4

[otnipecar]

I am getting what sounds like a vacuum cleaner running at full speed from my air box when it sits and runs. It almost seems that it is trying to get more air. I can take the top off while it is running and the noise stops. It has done this with both a paper filter and a K&N. Anyone have any ideas on how to get rid of the noise? Thanks.

99 Ranger XLT 4X4 4.0L Auto.

 

[cectom]

noise

replace full set of intake gasket not the "old number" the superseded set this is the FEL-PRO MS98006T number from RockAuto.com

 

[wa2be]

I am getting what sounds like a vacuum cleaner running at full speed from my air box when it sits and runs. It almost seems that it is trying to get more air. I can take the top off while it is running and the noise stops. It has done this with both a paper filter and a K&N. Anyone have any ideas on how to get rid of the noise? Thanks.

99 Ranger XLT 4X4 4.0L Auto.

A bad IAC (Idle Air Control) valve will make this same noise and it sounds like it's coming out of the airbox. It's a relatively cheap part (under $60 if I remember right), and takes about 10 minutes to change. It's mounted on the driver side of the intake manifold, right behind the throttle body.

 

[BrokeRecord]

Ha,Ha, my IAC used to act up on my 99. It always waited till it had an audiance, and I would make a grand entrance. Give it a shot of WD40 and if it gets quiet for a few seconds go get a new one.

 

[00RangerBlu]

Mine does it in the the cold and usually a blip from the throttle and it goes away. I would like to fix this. Good info

 

[99rager]

my 99 4.0l 4x4 is doin the exact same thing.. but only after i drive it for a while. Gunna get a new IAC valve soon and hopefully it takes care of it.

 

[timmah]

my 95 just started to do that aswell, i took mine off and sprayed throtle body cleaner in it, let it soak awhile, cleaned the inside with a q-tip and no more howl out of mine