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>In either situation, cold air which was seeping into the pipes
>(like when downshifting) would rapidly expand in the hot pipes, and then
>cause a backfire as it heated up, and mixed with the other exhaust
>gasses. The problem is not too serious, this is most likely the cause,
>if the block is new, maybe your screws on the muffler are not on
>securley enough. Check for leaks, and tighten those screws, if the
>problem persists, it may mean something more serious.
Sorry, but this is not a cause of backfiring.
Jim
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Melissa Kepner Jim Adney
jadney@vwtype3.org jadney@vwtype3.org
Laura Kepner-Adney
Madison, Wisconsin
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