Message text written by Randall Young
>I've lost track of which car this thread is about, so I'll just throw in a
caveat :
The "lift the piston" test does not work for later cars with US emissions.
It will always indicate lean, because the emission carbs were calibrated to
run lean at idle, to reduce CO emissions.
<
True, but, if the mixture is set so lean that it effects the idle speed
when warm it will indicate rich. If he doesn't get this indication then he
needs to stop looking at the mixture and look for other causes.
Dave
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