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  #1  
Old 06-16-2012, 03:30 PM
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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
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Old 06-16-2012, 05:59 PM
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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
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Old 06-17-2012, 12:42 PM
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Re: my cat sounds like a knocking valve

well when the motor is off i can hit the cat and i hear rattling
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Old 06-17-2012, 12:46 PM
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Sounds like some of the catalyst material fell apart and is rattling around inside the cat.


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My Jeep: 2001 Grand Cherokee Limited, 245/65R17 Falken Rocky Mountain ATS, K&N drop in air filter, Bilstein HD's. De-badged, eagle-eye LED Tails & LED 3rd brake light, Addco front and rear sway bars, Superchips tuned & TM snip, interior 6k LED's, Gen3 ccfl projectors with Volt 6k HID lows, akebono brake upgrade with R1 Concepts premium rotors.
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Old 06-17-2012, 12:48 PM
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Re: my cat sounds like a knocking valve

ya thats what im gessing to
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Old 06-18-2012, 09:40 PM
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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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Old 06-20-2012, 04:17 PM
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Re: my cat sounds like a knocking valve

Thunderbolt metallic cats, done.
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