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Well 90 CRX-Si, Strange rattle

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Old 06-13-2007, 05:51 PM
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theleprechaun
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Default Well 90 CRX-Si, Strange rattle

I have a weird rattle coming from the underside of the vehicle. I assume its from the exhaust tin. Has anyone had any similiar experiences so that I cna better track it down. I doublechecked everything I cna and it seems okay but I'm not positive.

Any ideas are appreciated

It only happens between 2 1/4k rpm and 2 3/4k rpm. With the clutch in or out it still happens. Very metalic rattle sound.
Old 06-13-2007, 08:12 PM
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daddiodanger
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i had a similar problem,
it turned out to be little rocks rattling around between the cat and its heat shield.
Old 06-14-2007, 08:09 AM
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Thats what I was hoping to hear. I'm off to check it out now. (Stupid desert gets hot after 9 am)
Old 06-14-2007, 08:44 AM
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Default Strange'''

Seems like there was a stray nut from the engine swap that slipped into the shift linkage between the 2 bolts on the right side and the knuckle, the sounds gone for now but I won't kknow for sure until I drive it.
Old 06-24-2007, 07:59 PM
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shorty_boy
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Default i seem to have the same problem

between 1.5 thru 1.75 k but only when the car is moving. i'm gonna try that and see if it will change.
Old 06-28-2007, 05:02 AM
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Default Yea sounds gone

Unfortunatly a week later the rust from the snow and deicer in colorado finally allowed the muffler to snap @ the resonater so I have no back pressure and the car sounds like crap. New part in 3 days (conects to catalytic then runs down to muffler ((resonator w pipe) but no rattle anymore except for the tin on the snapped pipe.
Old 06-28-2007, 05:03 AM
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Originally Posted by shorty_boy
between 1.5 thru 1.75 k but only when the car is moving. i'm gonna try that and see if it will change.
NO its also at idle. But not as large a range, I could hold about 2.5 and it would hold the rattle too.

Last edited by theleprechaun; 06-29-2007 at 12:24 PM. Reason: 2.5k not 1.5k oops
Old 06-28-2007, 11:27 PM
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Default New part

Well the generic exhaust pipe (pipe B, resonator w/pipe [the piece that connects the catalytic converter to the muffler itself] was only 106 dollars from autozone and took 2 days to arrive. The bolts were so rusted I ended up dropping the cat with the resonator pipe and sawing of thenuts to free the bolts that attach the cat. Took a few hours work to set it all back up but now it runs fine, rusted parts can be a pain, worked fine one day next i have a snapped pipe.
Old 06-29-2007, 12:48 AM
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What it probably was, and this was my scenario, the internals on the resonator on the b-pipe had come apart and were rattling on the inside. It sounded like a soda tab rattling inside the can at higher RPM's. So I cut the resonator off and straight piped it. Problem solved.




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