High RPM Rattling

Black4CylMX3 · Post by **Black4CylMX3** » January 12th, 2006, 11:54 pm

Whenever i hit higher RPMs most of the time, i hear a rattling underneath the car and it causes it to shake and vibrate a noticeable amount. I think it would be something like a clogged cat but i'm not completely sure. Anyone have any idea?

Shades · Post by **Shades** » January 13th, 2006, 12:05 am

Get a hammer and tap your exhaust... tap the heat plates too. I found that one of my heat plates was rusted and was loose and around 3000rpm it would rattle. It's most likely the plates around your cat.

Black4CylMX3 · Post by **Black4CylMX3** » January 13th, 2006, 12:12 am

Yeah i've had the heat shields being loose problem and having it rattle around 3k rpms before, but this is different, like it shakes the entire car, i'm going to check to make sure nothing is loose though.

nicksmx3 · Post by **nicksmx3** » January 13th, 2006, 10:40 am

i bet you it probably just needs a wheel balance...that happened to me on my old car. it only cost like 15 bucks for a balance so might as well get it done anyways

ryanlindenberg · Post by **ryanlindenberg** » January 14th, 2006, 9:00 pm

check your motor mounts.

nicksmx3 · Post by **nicksmx3** » January 14th, 2006, 9:40 pm

i dont know if it would be motor mounts though cuz that would be more of a loud BANG followed by the hood jump a little. lol i had that happen a few times on my taurus its violent lol

93_mx3_gs · Post by **93_mx3_gs** » January 15th, 2006, 11:40 am

Look at the rear of the car by the muffler, they used a stupid design for the dual output muffler hangers, after time they start to bang against that little tow eye loop metal.

Black4CylMX3 · Post by **Black4CylMX3** » January 15th, 2006, 2:34 pm

In reference to the hangers near the muffler, if it is doing this how would i fix it?

93_mx3_gs · Post by **93_mx3_gs** » January 15th, 2006, 7:11 pm

secure it using zip ties or something or drill tap a hole and get a rubber stop with bolt. heres a pic of an idea of where I mean to look -

this is an example see how the hanger will hit the eye loop if vibrating, hope this helps.