Tin Like Rattle/ Grinding On Startup

chasAZmtbr

chasAZmtbr

New member
My 2008 2dr has been making an annoying rattle for a while now. I always assumed it was something simple like a loose heat shied but I haven't been able to find anything wrong with the heat shields on the exhaust. It lasts about 10 sec when I first start the Jeep and then stops and happens again when I first accelerate then it's gone. Seems like it goes away when the Jeep is warmed up. :thinking: I'll post a video clip of the sound. Have any ideas what it could be?
 
Canvas JK

Canvas JK

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Sounds to me like you have an idler pully bearing going bad. Try hitting the bearing with some lubricant to see if it goes away. Do one at a time as process of elimination. Once you find the one causing the noise you will know which one to replace.

R/
Will
 
Serg5000

Serg5000

New member
Check the thin steel plate or heat cover they weld onto the exhaust. It's on the cross tube. I believe it's just in front of the t case. Mine was doing that. I just got under there and dropped some weld on it. Problem solved.
 
A

Army_Vet

Banned
It sounds like something is hitting the Flywheel teeth!

Almost as if the starter solenoid is re engaging for some reason.

Is it the exact same every time? To have the starter engage on its own is quite odd. Stranger things have happened.

It definitely sounds like something hitting the flywheel teeth to me
 
chasAZmtbr

chasAZmtbr

New member
Canvas JK said:
Sounds to me like you have an idler pully bearing going bad. Try hitting the bearing with some lubricant to see if it goes away. Do one at a time as process of elimination. Once you find the one causing the noise you will know which one to replace.

R/
Will
Click to expand...

How do you lube the idler pulley? And is there a specific lubricant I should use? After doing some more research it looks like this should be a cheap and easy piece to replace. Thanks for the advice
 
Moochie

Moochie

Active Member
chasAZmtbr said:
How do you lube the idler pulley? And is there a specific lubricant I should use? After doing some more research it looks like this should be a cheap and easy piece to replace. Thanks for the advice
Click to expand...

Mine was squeaking and I used some dry lube to quiet it down.
 
chasAZmtbr

chasAZmtbr

New member
Army_Vet said:
It sounds like something is hitting the Flywheel teeth!

Almost as if the starter solenoid is re engaging for some reason.

Is it the exact same every time? To have the starter engage on its own is quite odd. Stranger things have happened.

It definitely sounds like something hitting the flywheel teeth to me
Click to expand...

It happens every time I start the jeep after it's cooled down for a few hours. If something was hitting the fly wheel teeth wouldn't the sound be constant?
 
A

Army_Vet

Banned
chasAZmtbr said:
How do you lube the idler pulley? And is there a specific lubricant I should use? After doing some more research it looks like this should be a cheap and easy piece to replace. Thanks for the advice
Click to expand...

What you would do is with it running. Spray some lube on the face of each pulley. If the noise goes away then that's the bad one. I would replace it.
But unless everyone else is hearing a different video than I am, its not a pulley. Its too loud. It sounds like its the flywheel hitting something to me
 
A

Army_Vet

Banned
chasAZmtbr said:
It happens every time I start the jeep after it's cooled down for a few hours. If something was hitting the fly wheel teeth wouldn't the sound be constant?
Click to expand...

Yes I think it would be.... that's why this is so odd.

My advise..... get under the jeep and have someone start it. With your hand on the bell housing you will be able to tell
 
chasAZmtbr

chasAZmtbr

New member
Army_Vet said:
What you would do is with it running. Spray some lube on the face of each pulley. If the noise goes away then that's the bad one. I would replace it.
But unless everyone else is hearing a different video than I am, its not a pulley. Its too loud. It sounds like its the flywheel hitting something to me
Click to expand...
I'll try to get a better video (under the hood) with better audio
 
mjbjw

mjbjw

New member
Do you have any aftermarket skid plates?

Sent from my SAMSUNG-SGH-I747 using WAYALIFE mobile app
 
A

Army_Vet

Banned
chasAZmtbr said:
Unfortunately no. I checked the exhaust again and still found nothing and haven't had a chance to try lubing the idler pulley. Hopefully I'll get a chance to take a look at it this weekend
Click to expand...

Im sorry but if you had a pulley making that sound it would have completely failed by now and left you on the side of the road
 
JK-JOHN-E

JK-JOHN-E

New member
I had what sounded like the same thing after I had my 2'' BB installed. The sway bar was barely touching the exhaust. Sound would happen at start up and when first moving then would go away...THE SOLUTION was slightly longer exhaust brackets/hangers. Hope this helps.:thumb:
 
mrmet1983

mrmet1983

New member
Hear shield is what it sounds like to me


I don't always wheel , but when I do I keep it tight......... Stay dirty my friends.
 
chasAZmtbr

chasAZmtbr

New member
sorry for not responding for so long. Still no new update on the sound. Still there but I've just learned to ignore it :grayno:
 
B

Briguy114

New member
I had something similar on my 07. Ended up having to drop the factory skid to find it. Broken weld on a heat shield. New weld and the sound was gone
 
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