Knocking sound?

HONDAVACCORD

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My car just hit 190xxx miles
I gradually started hearing a knocking sound
Its a 2002 accord lx sedan 4 cyl. Automatic trans.
I thought it was plastic hitting my wheel lol
I got rid of the plastic hanging and it wasn't.
My car overheats sometimes if I have the AC on but I havent turned it on in months and it hasnt overheated.
I notice my air is turn between hot and cold but more in the cold direction and I put it all the way back to the heat side and it stopped knocking alot but still knocks.
The more I accelerate the less it knocks but when I let off the gas it knocks and while my foot is on the brake it stops knocking gradually.

Have any ideas what causes this?what I can do to fix it?

Thankyou
 

jdmcg3

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i just had somewhat the same problem.. it turned out to my catalytic converter went bad..

park the car and turn it on. have a buddy give the car a few revs as you work around the car to determine where the noise is coming from..

other than that theres not much i can tell you from the information given.
 
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