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-   -   my cat sounds like a knocking valve (http://www.jeepgarage.org/f196/my-cat-sounds-like-a-knocking-valve-43421.html)

stephanwj 06-16-2012 03:30 PM

my cat sounds like a knocking valve
 
so i started my jw 4.7 h.o. today and heard a knocking from under so quikly i went under to see /hear where its comeing from before my cats could get hot i stuck my ear on the driverside cat and heard the knocking so my Q is whst would be the cheapest whay to fiz this but i dont want to go straight piped

Sqall12001 06-16-2012 05:59 PM

Re: my cat sounds like a knocking valve
 
Uh, I'm guessing it's an echo'ed sound from the engine coming down the exhaust. There shouldn't be any moving parts in the exhaust, and defiantly none that sound like a knocking.

-Nick

stephanwj 06-17-2012 12:42 PM

Re: my cat sounds like a knocking valve
 
well when the motor is off i can hit the cat and i hear rattling

01grand 06-17-2012 12:46 PM

Sounds like some of the catalyst material fell apart and is rattling around inside the cat.


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stephanwj 06-17-2012 12:48 PM

Re: my cat sounds like a knocking valve
 
ya thats what im gessing to

hoffmanestates 06-18-2012 09:40 PM

does ticking get louder when accelerating.??? just to be safe do either compression check or leak down test to make shure...I heard horror stories from machine shop guys bout 4.7.

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FlyinRyan 06-20-2012 04:17 PM

Re: my cat sounds like a knocking valve
 
Thunderbolt metallic cats, done.


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