Whistling right above engine.

[DerekTheGreat]

Well you'd just be checking to see if that is the source of the leak, maybe that's not the thing causing the noise.

[porschpow]

Where could the potential leak be, besides where it mounts to the throttle body?

[DerekTheGreat]

Dunno, the armchair quarterback in me is thinking of my nose when it's full of crispy boogers... My nose whistles until they're cleared away by pneumatic or mechanical means. So, perhaps you do indeed have crud built up on that plunger and so it couldn't hurt to take the thing off, clean it thoroughly and give it a new gasket. You say it gets worse as it warms up which supports my booger theory as the plunger will close more to reduce the idle but since crud is potentially built up on the plunger it could be causing the whistle....

[porschpow]

Update,

So I cleaned around the throttle body (the flappy thing) and in addition took off the IAC and cleaned it with brake parts cleaner (made sure to get inside there). cut Anew gasket out for her and put it back in. I have now noticed that the idle def went down quite a bit. On cold start up it will even just about stay at low idle so it barely runs, which I guess is a good thing and bad thing.

I had noticed that as I was cleaning up and the car was running, like a light switch it started to make the whistling noise again!!!!!!!!!!

[DerekTheGreat]

When I fire my TC up in dead cold conditions it stays at high idle for about 20 to 30 seconds then drops down to a lower idle then finally normal idle once fully warmed up. Yours should be doing the same thing. I vote dying stepper motor or stuck plunger. When you take the IAC off you gotta take the little screws off that hold the stepper motor to the IAC body, clean all that real good, then lube up the stepper motor with some lube. I used Lucas chain lube. No issues in 1.5 years so far.

[sly]

Update,

So I cleaned around the throttle body (the flappy thing) and in addition took off the IAC and cleaned it with brake parts cleaner (made sure to get inside there). cut Anew gasket out for her and put it back in. I have now noticed that the idle def went down quite a bit. On cold start up it will even just about stay at low idle so it barely runs, which I guess is a good thing and bad thing.

I had noticed that as I was cleaning up and the car was running, like a light switch it started to make the whistling noise again!!!!!!!!!!

Sounds like the IAC is stuck shut, fried, or the connector fell off.

[gadget73]

yeah its not supposed to idle stupid low.

[porschpow]

Well, I swapped out for a new IAC, idles Beautifully however, it still whistles, So I went around the motor, and the whistling gets really ear piercing when you go in that little area BTW the firewall and back of the motor on the passenger side. I will post pics of the location

[DerekTheGreat]

Vac leak. Probably coming from under the manifold as that's where all the tubes/T's live.

[porschpow]

Well under the manifold, I don't think there are any vacuum tubes and t's.

Maybe for the boxes, but I don't think the 4.6's have them there.

I do suspect a vacuum leak though

[DerekTheGreat]

Oh, I thought we were talking about the '89 Townie as it's the only panther listed in your signature and you didn't specify the vehicle previously.

[sly]

But the thread is in the aero/whale tech section.

yeah... I've made that mistake plenty too.

[sly]

the vacuum tree is in the same general area on the firewall. Definitely worth a check of the AC vacuum lines and the tree itself. May just need new hoses as they may be almost rock hard and not sealing any more (the fat ones are known for that.. like the one the AC check valve is on).

[porschpow]

How would you check around the tree? Just do the propane test??? I tried doing that, idle didn't surge..

Maybe I didn't hold it close enough to the tree (the propane nozzle)

[DerekTheGreat]

But the thread is in the aero/whale tech section.

yeah... I've made that mistake plenty too.

..yes, yes it does. I'll see my way out now.