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Thread: Exhaust manifold valve

  1. #1
    Join Date
    Apr 2010
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    Exhaust manifold valve

    I have a Buick Special Convertible from 1957 with some noise (sounds like metal against metal) when the engine gets warmer. Some times I can run 20 miles - other times 40 miles before the noise starts low and then gets higher. The noise stops when I give full gas or no gas, but is constant by cruising.

    I have been told that it might be the heat control valve with the bi-metal thermostat, which is broken.

    Is there somebody who can advice me?

    Best regards


  2. #2
    Join Date
    May 1999
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    Wire it up and see if it still make the noise.

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