The oil seals on the supercharger can fail and cause excessive oil consumption and bluish gray smoke from the tail pipe. Supercharger replacement is commonly required to correct this concern, this can also be an expensive repair.
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Newest reported 2002 Mazda Millenia problems
There are T-shaped vacuum connectors under the intake manifold that can break and cause a rough idle.
Timing belt replacements can be very expensive on the supercharged models. It is important to be sure the timing belt is replaced at the scheduled interval.