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.
Randall
David Massey wrote :
>
> Restart the engine and using a 3/32 drill bit gently lift the
> piston enough
> to pass the drill bit through the venturi. Does the engine speed a) speed
> up, b) remain the sameor c) slowdown. If the answer is a) you are too
> rich. If it is c) you are too lean. If it is b) you are about right.
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