Blownbayou

iTrader: (7)

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

94Z28-MSTGKLR

iTrader: (20)

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.

joecar

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.

Blownbayou

iTrader: (7)

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.

jimmyblue

iTrader: (11)

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

joecar

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

blue95

iTrader: (1)

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.

Blownbayou

iTrader: (7)

just worried about raspy sound on the magnaflow.......... Guess I can gut and if I do not like it, go with highflows

Nick V.

iTrader: (1)

huh....i wonder if this is my rattling/marble sound.....