Rattling Cats???

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Mar 7, 2012 | 02:39 PM

Blownbayou

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From: South Louisiana

Rattling Cats???

Think I have the rattle cat....... Rattles only when sitting at a stand still during idle. It comes and goes.... Example: Rattle Rattle Rattle................Rattle Rattle Rattle....... etc. Can hear it really well when next to a building or wall of some sort.

I thought it might be the heat shield around the cats, but they seem attached securely. Does this sound like a busted up cat????

Thanks

Mar 7, 2012 | 03:33 PM

94Z28-MSTGKLR

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From: Lacey, WA

Sounds like it. My car was doing the same thing until peices of the cat started coming out of the pipe. Of course I had a sweet thunder dumped off the factory y pipe so it didnt have far to go. Took off the pipes to install the headers and my cats just dumped all over the garage floor.

Mar 7, 2012 | 03:34 PM

joecar

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From: So.Cal.

Is this on your F-body..?

On mine it was the i-pipe ID had expanded allowing the y-pipe to fit loose...

I fixed by expanding the y-pipe (using a pipe expander) so it fit snug in the i-pipe.

You might want to first check if this is it or not.

Mar 7, 2012 | 06:01 PM

Blownbayou

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From: South Louisiana

thanks for the replies.... F-bod for sure. Going to tap on the cats with a rubber hammer to see if I hear some loose chunks. If not.... going to check I pipe.

Mar 7, 2012 | 08:25 PM

jimmyblue

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Look on the bright side - now gutting ought to be a piece
of cake.

Mar 7, 2012 | 08:42 PM

joecar

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Yes, piece of cake, if he doesn't need the cats for emissions testing.

Mar 7, 2012 | 08:55 PM

blue95

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From: Holden Beach, NC

My '95 had the same symptoms...TWICE. The first time it started off as a rattle, then got worse and worse. One day, I was accelerating onto the interstate and noticed a definite loss in power. I stayed in the gas and a few seconds later had a large black puff of smoke exit the exhaust pipe. Turns out the guts had come loose and became unaligned with the exhaust pipe creating mass amounts of back pressure. So, I replaced the cat with with an aftermarket one.

2 years later, same symptoms...rattle rattle rattle.....rattle rattle rattle... I pulled the pipe, grabbed a loooong prybar and gutted it. Since it was a '95, it passed the visual inspection because it looked like it had a cat. Problem solved.