Strange sustained ringing noise?

[Brice]

Hey guys I have a 2006 4L and an odd noise that I can't really describe as a screech or rubbing but more like a sustained ringing or "beeing" noise. I seem to get this noise when I drive for a longer periods at a time but only when idling and/or parked. It also sounds like the "beeing" gets slightly muffled once I push the brakes does anyone have any ideas as to what that is? Thanks in advance.

 

[Obi-Wan]

Fill in your profile please. Without knowing what equipment your Jeep has (axels, transmission, transfer case, lift, aftermarket parts / accessories, etc.), it will be much more difficult to give a good diagnosis.

 

[Brice]

Good idea, I will do this.

 

[TheBoogieman]

Is your wife riding with you when this ringing bee noise happens? I muffle all noises with ear plugs when mine rides with me. Loud stereo and worn MT tires won't drown it out.

 

[elkivory]

Not sure on the wrangler, but I remember disc brakes having a tab that when you reached a wear level needing pad replacement that would start to kind of whistle. Kinda seems like applying brakes would muffle sound.

 

[Brice]

Is your wife riding with you when this ringing bee noise happens? I muffle all noises with ear plugs when mine rides with me. Loud stereo and worn MT tires won't drown it out.

As a matter of fact she was, I think you may have a point lmao

 

[macleanflood]

E brake on or stuck? Shooting in the dark here.

-Mac

 

[Dr. Internet]

I've had the same noise since I turned 72. Funny thing is, I hear it whether my LJ is running or not.

 

[dbbd1]

Hmmm, wonder what the OPDA looks like?

 

[Brice]

Thanks for the ideas guys, ill take a look at my disc brakes then the opda. E-brake is all disengaged. I was also considering maybe it was a vaccum leak or an intake or exhaust gasket? I just dont know how that would slightly be muffled by braking. As for the tinnitus, hoping thats not it at my age, although you got me thinkin.

 

[LONGJP2]

but only when idling and/or parked.

Where have you looked?

 

[Rickyd]

Tinnitus

 

[carrotman]

You might be onto something with the vacuum leak. Would make sense that the tone changes or goes away when you apply brakes because of the brake booster.

I think the correct way to check is with a smoke machine, but I think you can do something along the lines of spray down the hoses with brake cleaner with it running and listen for the idle to change to find a leak.

 

[Brice]

Alright ill be checking all this stuff on my next day off soon then guys, I appreciate all the ideas. Ill come with whatever info i get out of checking this stuff out.