knocking/ rattling noise

[nilex10]

hi im not sure if this is the correct place to post this. i have a countious knocking/rattling noise, like something loose, comming from the rear passenger side area or under passenger side rear under door area. took it to mechanic and they cant seem to locate the noise. the noise is always there and the only way it goes if i go over dirt road with lots of potholes. it goes but when i shut the engine off and start it again its back. any help to find the source would be greatly appricated. driving me nuts

 

[seabass1858]

sounds like the guts on your catalytic converter are breaking apart and collecting at the bottom and rattling through your exhaust, I had this happen to my old 1983 silverado with 300k miles on it, i installed a whole new exaust system back in 2006 and it hasn't done it since.

 

[J'sJeep]

Probably the tensioner. Does it happen when in drive or reverse with brake applied? When you speed up it would put more tension on belts and when idling in gear would be less tension and would cause tensioner to rattle. Have buddy sit in the jeep on drive and hold brakes, put screw driver on the tensioner( not just the pulley but the centerpiece holding both pulley arms where it mounts to engine) and see if you feel larger vibration through screw driver there than if you put it else where. This will help isolate where the rattle is. 35-50 dollar part. Waaaay cheaper than ac. Let me know!

 

[nilex10]

how do i do this. not that mechanically inclined

 

[nilex10]

no it happens all the time, sound seems to come from rear to middle passenger side and when i hit bumps it rattles worse.

 

[J'sJeep]

Loose heat shield or exhaust component?

 

[nilex10]

i cant seem to find it