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  #1  
Old 03-13-2011, 04:59 PM
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Come and Go "loose" rattle

Hi i have a weird one.

our 2000 wj started to develop a odd noise last night.
on the way home i started hearing a weird (faint) noise like a loose pulley.
then it went away. went out this am and checked the engine over with the motor running and nothing looks loose. drove the truck and after a littyle while the noise came back ( a little louder) i shifted into neutral, reved the motor and the noise stayed but didnt change.

it happens at part throttle or a constant speed


HELP! im lost and ideas?


Ray
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Old 03-13-2011, 07:30 PM
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Re: Come and Go "loose" rattle

Anytime I hear "rattle" I automatically think "catalytic converter". What motor?
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Old 03-16-2011, 05:49 PM
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Re: Come and Go "loose" rattle

Its a 4.7. the odd thing is it sounds like a front brake pad is sticking. i can hear the brake pad sound while driving but just looking at all the rotors none look bad or like th rivets hitting a rotor... might be able to get under the jeep and look at the inside of the rotors this weekend. still to muddy in the drive.
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Old 03-17-2011, 10:36 AM
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Re: Come and Go "loose" rattle

Will the sound change a bit or disappears when you touch the brake pedal gently? It can be that the sliding pins are dry or corroded and that the caliper will not return after braking.
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Old 03-17-2011, 12:44 PM
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Re: Come and Go "loose" rattle

Does it appear only when the Jeep is warmed up? If so, I'd suspect the exhaust even more. Maybe a rattling heat sheild, or a hanger gave and now something is touching. Sounds like you need to get under there with a good light.

It's a mudpit here too...thank gawd I have a garage to roll around in.
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Old 03-17-2011, 02:17 PM
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Re: Come and Go "loose" rattle

Your waterpump will make a rattle noise when the bearing goes out. if you grab your fan (the mechanical one) and wiggle the fan, if the fan moves and the pully moves AT ALL you need a waterpump (reguardless of if its this concern or not just putting that out there)...

One thing that you may, want to do to verify is loosen the tensioner, this will take pressure off the w/p pulley and allow a better visual on the pulley moving or not.

As mentioned, there are plenty of other things that can rattle though.
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Old 03-17-2011, 05:31 PM
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Re: Come and Go "loose" rattle

doesnt matter of the Jeep is warmed up or not. the noise doesnt change if you touch the brakes, but it does go away if you stop moving. the water pump does move a little, but i have NEVER heard the noise when the Jeep isnt in motion. our drive way is a lake (spring thaw in wisconsin) right now ill try to get under the jeep this weekend.
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Old 03-17-2011, 07:58 PM
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Re: Come and Go "loose" rattle

Check your front driveshaft.

Just grab it and see if it wiggles either at the splines or the U-Joints. It shouldn't have any play.
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Old 05-01-2011, 04:20 PM
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Re: Come and Go "loose" rattle

206WJ

it WAS the front drive shaft thanks for the tip!!!


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Old 05-01-2011, 06:13 PM
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Re: Come and Go "loose" rattle

Was the problem play on the CV or U joint?
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Old 05-01-2011, 07:45 PM
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Re: Come and Go "loose" rattle

i dont know yet. we just had the time to track the noise down today and are fixing it next weekend


ill keep you posted
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Old 05-01-2011, 10:44 PM
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Re: Come and Go "loose" rattle

Quote:
Originally Posted by rayray View Post
206WJ

it WAS the front drive shaft thanks for the tip!!!


Ray

No problem... If it's the U-Joints it's not that hard to do yourself.

What T-Case do you have?
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