Originally posted by showgunz
To fix the whistling, you have to adjust the idle speed in your throttle body. Turn it up for more air flow at idle. I'd say turn it about a turn to a turn and a half. That should do it. If it doesn't, turn it up some more. After doing this, the sound of my intake changed into a deeper roar and the sound near redline also changed to a deeper note as well. But the most important thing was that I didn't hear whistling anymore! And I think I got more power out of it.
So! TURN YOUR IDLE SPEED ADJUST SCREW ON YOUR THROTTLE BODY TO GET RID OF YOUR WHISTLING. Do this and report back to me because I haven't seen anyone else do this and tell me that it worked.
I have a 99 four-banger. I couldn't get the "plug" out of my idle speed adjustment screw. Any ideas? Am I supposed to destroy the plug when I dig it out? It looks like they just shove some wax in there? I can't find anything to grab hold of to get it out of there. It ain't in a very convenient place either on my 4cyl. After I get that figured out, I'll make the adjustments and report back. Until then, still whistling!