Yet another whistle noise

[mgroeger]

I have developed a new noise, it is a very loud whistle sound. Loud enough that the Mrs. heard it on the road while she was driving behind me. It starts after around 20 - 30 mins but it is not consistent. I noticed when I let off the gas and coast it goes away but when back on the gas it starts up. When I come to a stop it too stops and sitting at the light in gear or neutral when I rev the engine it does not occur.
That poses a problem for hunting this down as it's hard for me to pop the hood and check under their for the noise while going 30 mph :/

 

[dbbd1]

Have a GoPro type camera (last resort- your phone)? Secure it to the jeep, in various spots, to try to at least isolate the area of the noise.

 

[mgroeger]

Have a GoPro type camera (last resort- your phone)? Secure it to the jeep, in various spots, to try to at least isolate the area of the noise.

Not a bad idea. No go pro or smart phone for that matter. Maybe use the Mrs. phone.

 

[dbbd1]

Old-timey (you know, like the early 2K's) mini voice recorder, ha?

 

[mgroeger]

 

[dbbd1]

Well, you wouldn't miss it if it fell off!

 

[mgroeger]

Well I have more info now. I put the Jeep in neutral and turned the engine off while moving and the noise still exists. That tells me it's something to do with a moving part. The frequency doesn't seem to change drastically with speed. I've read that someone discovered it was their rear pinion bearing and or seal that was going. If I had to guess I think it is coming from the front though. @Jerry Bransford @mrblaine @Chris in case you guys have ANY insight.
I also read that the rear manifold bolts can be slightly loose but obviously with engine off this wouldn't be the culprit however I'll throw a wrench on them anyway.

 

[Jerry Bransford]

Well I have more info now. I put the Jeep in neutral and turned the engine off while moving and the noise still exists. That tells me it's something to do with a moving part. The frequency doesn't seem to change drastically with speed. I've read that someone discovered it was their rear pinion bearing and or seal that was going. If I had to guess I think it is coming from the front though. @Jerry Bransford @mrblaine @Chris in case you guys have ANY insight.
I also read that the rear manifold bolts can be slightly loose but obviously with engine off this wouldn't be the culprit however I'll throw a wrench on them anyway.

No clue other than I had a screechy sound that was strictly wheel-rpm dependent which turned out to be a bent sheet metal shield, the one on the inboard side of the brakes. Mine was bent just enough to drag on the brake rotor and just loud enough to make me think the worst.

 

[Chris]

Good luck tracking this down, seriously.

I had the most annoying noise for the longest time that happened only when I went over bumps that sounded like the tire hitting the body. Took me forever to track down, and I finally found out it was the boot on the Rancho shock contacting the gas tank skid. Took the boots off and problem solved.

Anyways, that's the LAST place I would have thought to look, so my suggestion is to first try and rule out the most obvious stuff.

If all else fails, don't be so stubborn to think that you shouldn't take it to a mechanic. Even the best of us can't be expected to fix it all on our own.

I definitely like the GoPro idea though as a starting point.

 

[mgroeger]

I found out where the noise is coming from. Someone else on a different thread mentioned it could be the rear diff drive shaft seal. Put the rear up in the air when I got home since everything was good and hot and it was making the noise. Fired it up and after about a minute of running it made teh noise and it is coming right from where the drive shaft enters the diff. Is the other poster correct that it could be the seal or is it more likely the bearing?

 

[AndyG]

Carefully lift it and run it . Just be careful .