whistling in intake manifold
 

ok, i have a really high pitched whistling coming from my intake manifold,

dont know what the ---- it is but its coming from inside the manifold

very audible when just standing near the idling engine, but when you put your ear to the manifold itself it is crazy loud.

any ideas.

what i think it might be is that my idle bleed screw is clogged(even though i just took it off and cleaned it)

and its the air being sucked past the throttle plate.

reason i believe so is that when i adjust my idle screw in and out it does not seem to change the idle yet when i pull a vacuum lne my idle jumps up about 400-500 rpm and idles there.

idk and honestly, aside from a very anemic idle the car runs

Re: whistling in intake manifold
 

So when you blip the throttle dose it go away? I had a iac that would just make a fucked up whine. If i un pluged it, it would stop. I replaced it and all is now good.

Re: whistling in intake manifold
 

hmm, ill try the iacv.

i cant tell cuz when i blip the throttle my car is loud.

really loud.

Re: whistling in intake manifold
 

stock manifold? what motor?

Re: whistling in intake manifold
 

sounds like the exact same problem i had. honda i assume right? pull the FITV off of the bottom of the TB, and pull off the little plate with a phillips or 8mm socket. screw the white thing back in clockwise till it stops. hopefully this will fix your problem.

Re: whistling in intake manifold
 

no fitv, iacv blocked off.

aint no idle ---- on this bitch.

Re: whistling in intake manifold
 

could it possibly be one of the valves? have u done a leak down test on it?

Re: whistling in intake manifold
 

TB spacer. lol