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

 

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king cob, East Greenwich, RI, October 24, 2013, 14:57
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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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  • Answer #1

    G. T. Service Center (4142 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG October 24, 2013, 20:41
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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.

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    king cob, October 25, 2013, 04:18
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    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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    ProfessorG, October 25, 2013, 05:38
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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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  • Answer #2

    ziptie12 October 26, 2013, 21:42
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    While moving or just in park?

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    king cob, October 27, 2013, 05:43
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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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