Hello, when I rev my car the pass side of the motor growls or moos at me.. it trails off when I let off the throttle. I just replaced some belts becuase I had the alt belt break. And it took out the air pump belt.. the sound doesn't sound like it's coming from the air pump.. The sound sounds like it's coming from the exhaust manifold area.

89 vert.

I didn't know what to search for and you have to wait 20 secs between searches so sorry if this is covered. I did search for 'moo' and 'air pump.' I could maybe get a recording but I don't know.

 

The air pump will make some weird mooing noises if the intake is left open vented or there is a sizable leak in the air hoses.

 

The air pump feeds the air control valve (ACV) on the lower intake manifold (LIM).
Check for a hose off there.

 

yeah, after I made this post I found out that the problem was indeed the ACV hose off. Thanks for all the help though guys.. I try not to make posts unless I can't figure it out and apparently I jumped the gun a bit too soon.