So quite often actually I have been having a sound which appears to be coming from under my dash only when I'm driving. The most unusual part is that it sounds like a ringing in your ear...or in other words the sound you hear after a firecracker goes off and you don't put your hands of your ears. It's apperantly loud enough with the windows up for my wife to hear it over my exhaust which has no muffler and exits below where she sits in the back...Any Idea's? Oh, btw it lasts for a few seconds then goes away and it happens at random times.

Sounds like a vacuum leak. They are known to produce noises described as "ear ringing" or "tea kettle". If you pull out the glove box and remove the dash bezel around the HVAC controls, that will give you a place to start looking for a leak.

i have it too i thought it was from the dash but it's coming from under the hood actually I changed so much stuff around i dont know where to begin it goes away by itself if you let it idle long enough. mainly have it when coasting.

Okay, now that we're talking under hood, I'll tell you I have the same thing. Intermittent. I can go for a week or two and not hear it and then one day it will just start up again and make a hell of a noise for about 10-15 minutes.

In short, it's an intake manifold leak, or something attached to the intake. These are usually at the intake gasket, but it never hurts to check your other vacuum hoses and such. WD 40 sprayed at possible suspects while it's doing it will help narrow it down. Carbon build up around the throttle body butterfly plate can cause it to. I tightened up my intake/exhaust manifold bolts and that lessened the frequency with which it happens, but it still happens. I'm just waiting till I have a free weekend to rip everything down and change the gaskets out completely.

You may get lucky and have yours go away completely just by snugging up the bolts/nuts to the proper torque. Unfortunately, most reports I've seen relate to the bolt in the middle and back of the manifolds, which are the most difficult ones to get to. This is probably why they leak mostly at those points to begin with; they never got a proper torque-down during some other repair.

I'm sort of busy. Mcgver, mightn't he disconnect/cap his vacuum to his heater and see if that stops the sound?

Problem solved. turned out to be the little rubber washer on my idle air control valve. You got me thinkin I thought too it might be the gasket because I put headers on it a month ago but nope. I must have not had the rubber washer go into the throttle body correctly when i put it back together part of it was flat like a pancake. Good idea on the wd 40 for future reference.

I just read my thread. I assumed no one had posted. I ill start checking stuff tomorrow and get back to you guys.

Let us know. macgyiver is supper good.