1992-2000 Mercury Mariner 105-225HP outboards Factory Service Manual, Page 291Get this manual

1992-2000 Mercury Mariner 105-225HP outboards Factory Service Manual, Page 291

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Induction Manifold The induction manifold is common plenum chamber for accurate pressure measurementIt contains throttle shutters on throttle shaftsThe shutter opening (idle air opening) can be adjust