Weird Noise From Engine That Goes Away After A Few Seconds

[Conundrum2006]

No. Everything else is connected to the RPM, well the transmission could vary in theory but I'd throw my guess in with a electric motor or vacuum leak. Although the vacuum leak wouldn't just quit.
What a weird sound, I'd never have guessed the fan. Hope that is what it is.


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[HoosierJeeper]

My XJ's efan is going bad and the bearings make a rattling noise, can shake the fan quite a bit.

 

[eradicator006]

Definitely sounds electrical to me. To me it sounds exactly like my radiator fan when it kicks in.

 

[Conundrum2006]

After the motor swap in the commander on one of the test drives there was this odd sound I couldn't place, didn't seem to correspond with engine rpm or the transmission, turned out my passenger turned on the vent fan and it's bearings were on the way out. Drove me nuts for a few miles until I realize what she had done.



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[jamesbeat]

I have a small emergency kit in my glovebox that contains a whistle.

We had all these problems with the Jeep (bad tensioner and power steering pulley, and now this mystery sound) and then we heard a rattle.

My wife was like 'What the **** is it now?!"

Turned out it was the pea in the whistle....

I'll check the fan tonight and report back. Fingers crossed....

 

[jamesbeat]

So guess what?

IT WAS THE FAN!!!

I've spent so many hours searching for what it could be and worrying that I would need to make repairs I can't afford right now, and all this time it was just the fan kicking in.

There's definitely something wrong with the fan - there's no way it should sound like it does. The bearings must have gone bad.

At least it's a cheap and easy part to replace.

Thanks everyone for your help in narrowing it down

 

[HoosierJeeper]

Awesome! I'm glad it's a simple fix.

 

[dhula]

I have a small emergency kit in my glovebox that contains a whistle.
We had all these problems with the Jeep (bad tensioner and power steering pulley, and now this mystery sound) and then we heard a rattle.
My wife was like 'What the **** is it now?!"
Turned out it was the pea in the whistle....

First thing I thought of was this --> Click here

 

[uss2defiant]

get a good e-fan with good warranty.
The dorman fan I bought from autozone has lifetime warranty.

 

[ltd02]

First thing I thought of was this --> Click here

:happy175::happy175::happy175::happy175: