got a 2000ls motor in my 98 civic ex and i'm getting this odd clack clack noise when i start my car at first, then if i hit a bump it comes again. I thought it was my axels or something but its not constant, only when the first vibration of starting the motor and hitting a bump.

its coming from underneath the car for sure and i looked at my exhaust from below while starting my car and it moves a bunch. i'm thinking the rubber hanger things are worn out but not sure, anyway for sure to check it out without me taking it to an exhaust shop?

 

check to see if there is a loose heat shield. if not that than possibly an exhaust hanger as u stated.

 

most likely a heat sheild. the heat shield on the cat is a common problem with rattling

 

when people explain rattle, you mean like a metallic noise, this more like a thump i guess, like an object with a good amount of mass hitting another bigger object

 

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i have tightened mine up like 5 times.

 

Could be your muffler/piping hitting against something. Have somone turn on your car and check to see if anything vibrates alot. And be sure to check your hangers like you said.

EDIT: nevermind, you already did

 

checked it out, chunks of my nice carsound cat are coming apart on the inside and being blown around making the noise, i just blew out a honey comb chunk the size of a chicken mcnugget out the exhaust while at the shop

looks like time for a new cat.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by leadtrum &raquo;</TD></TR><TR><TD CLASS="quote">checked it out, chunks of my nice carsound cat are coming apart on the inside and being blown around making the noise, i just blew out a honey comb chunk the size of a chicken mcnugget out the exhaust while at the shop
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Nice I haven't heard many good things about carsound cats...

 

yea but not many options when considering a cat though. stock sucks ***, and others are way too expensive. and i don't want my car to smell like eggs and be loud with a test pipe.

so another carsound it is

 

try catco. they make a quality cat, not that i would ever use one.