This has been bothering me for awhile now. At EXACTLY 3000 rpm, there is this annoying rattle from my cat\downpipe area. I checked it out, and it looks like the springs that hold the downpipe to the cat are rattling. I shimmed both with a washer, but it still does it. Its not because thier too loose, because I tightened the hell out of them.

 

check loose hangers. If its not that i guerentee that its the cat.

 

I took both heat shields off. And I cant get the damn cat off, its rusted on. I broke a craftsman wrench trying to get it off, no joke.

 

damn man i have the same rattling noise so annoying when i downshift lol its so loud i cant seem to find it but it might be the springs no clue

 

trust me, its the guts inside the cat rattling around. get a new cat and it will be gone. id put money on it

 

Yeah just pick up a new cat. I had a mysterious rattling noise for like 2 weeks.. looked all over. Was just the inside of the cat shaking around. Exhaust gases are crazy... and can do stuff like only make noise at certain RPMs and frequencies... weird stuff. I'm w/ 1990si though =]

 

lol, mine is doing the same thing. But, hard to put on a new cat when it's rusted on

 

cut out old one with sawzaul, weld new one in. or clamp if you dont got a welder

 

Thanks guys, Its defniatly a possiblity. The cat has 185k miles on it, and my exhaust smells funny.

 

sounds like a faint spray can rattle/pinging? funny odor? DEFINATELY your cat.

 

It's your cat, cause it's my cat too!

 

If it's just the bolts that are rusted, wait until the exhaust is completely cool and hit the bolts with liberal amounts of Liquid Wrench. Let it sit for a few hours or over night, put a box end wrench on, and hit the wrench with a rubber mallet. I couldn't get my bolts to budge either but that did the trick.

 

i like cats.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by USDMSiR &raquo;</TD></TR><TR><TD CLASS="quote">i like cats. </TD></TR></TABLE> WTF....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by USDMSiR &raquo;</TD></TR><TR><TD CLASS="quote">i like cats. </TD></TR></TABLE><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by d16efhatch &raquo;</TD></TR><TR><TD CLASS="quote"> WTF.... </TD></TR></TABLE>


haha expletive cats....i hate them.


besides that...yes its your cat. happened to me befor. and its happening with my friends car as well