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Old 10-26-2011, 07:23 AM
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Catalytic Converter Rattling

I have been hearing a noise coming from under the hood when I accelerate or when idling. I opened the hood and would press the throttle and noticed the noise was coming from up under the engine. I got up under the car and could pinpoint the rattling noise coming from the catalytic converter. I cut the car off and tapped the converter with a rubber mallet and could barely hear a rattling noise but it didn't sound like something was loose in it. I haven't noticed the car running any differently other than hearing extra noise. I checked the bolts on the catalytic converter and everything was tight. Is this symptoms of the converter getting ready to die? Should I just wait it out until I start noticing problems? Is there a way to remove the converter and check it out?
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Old 10-26-2011, 07:26 AM
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Are you sure it isn't the shield around it?

That happened on my 1985 Accord and I just took it off.
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Old 10-26-2011, 07:38 AM
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Happened on my '94 just rip/cut it off. You really dont need it and it isnt required by law or anything.
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Old 10-26-2011, 05:02 PM
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Co-worker suggested it could be the double-wall down pipe has collapsed, and is now touching inside (downpipe=pipe between exhaust manifold and CAT)
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Old 10-26-2011, 05:18 PM
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Odds are quite good it's the heat shield around the catalytic converter. Go to your local hardware or big box home store (an auto store may have this too) and get a radiator screw-type hose clamp big enough to fit around the converter. Unscrrew the clamp completely, thread the open end of the clamp around the top of the converter and retighten. I'll bet the noise goes away.
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Old 10-26-2011, 06:28 PM
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It rattled with the shield that goes around the CAT, off...
Oddly thought, It stopped if I pushed slightly by hand on the CAT?
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Honda Accord, 2001, 2.3L (L4), F23A4, 4D EX - My main carů
Ford Taurus, 1992, 3.8L V6, - Trany prob's
Toyota 4x4 Extra Cab Truck, 2.4L SR5, 22RTE (Turbo) 1987, I still have.
Honda Accord, 1984, 1800cc? L4,
Plymouth Arrow, 1978?, 1800cc?, L4 (POS)
Chevy, Monza, 1976, 350cu, V8, My funnest car, think muscle car, poorly made...
Olds Starfire? 1975, 231cu odd fire, V6,
My first car, 1965 Chevy Impala 283cu V8, (I got during the mid 1980)
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Old 10-28-2011, 01:43 PM
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I'll attempt to remove the heat shield around the cat tomorrow to see if the rattling stops. Thanks for all of the suggestions and I will update you guys and let you know if that was the problem.
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Old 10-28-2011, 04:57 PM
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my cat was rattling because the core was broken off the walls, and was rattling around inside

i could tell where it was coming from by hitting it with a pry bar while it was jacked up
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