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Q: Loud noise sounds like exhaust only when engine is cold. Exhaust seems fine. on 2008 Honda Civic

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The noise sounds like under passenger floor boards. When engine reaches operating temperature sounds goes away. Also does make much noise outside the car on in the cabin.
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Moving low speeds...thanks to others with a similar problem and this blog, I solved the problem. I am not a parts changer, so I research all possibilities before going to the parts store. A number of others from this web site mentioned replacing the lower right motor mount. Since it hard to see if the motor mount is broken without disassembling the unit, I took a chance and purchsed a new one.Thanks to you folks, Autozone carriers this mount at significant savings. During the process of replacing the mount, it was confirmed the old one was broken. Thank you all!!
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Expansion and contraction! Could be a bad connection or crack. When it's cold it will pull away, when it heats up the metal will expand to help seal the leak. Very common.
I thought that also. I was leaning towards exhaust, I tried to find it a number of times. I took it to a muffler shop, but everything looked good. The interesting thing is, the noise goes away on a lift. After reading some of other Honda owners with a similar problem, right motor mount seems to be the remedy. I don't like spending money assuming the motor mount will recitify the problem.
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Might be advantages to have it on a rack overnight and test it first thing on 1st start up to diag the noise to be sure.
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