Throttle Body - Mercury MerCruiser MCM 454 Mag MPI Service Manual

MULTI-PORT FUEL INJECTION DISASSEMBLY AND REASSEMBLY

Throttle Body

REMOVAL
1. Remove the flame arrestor from the throttle body.
2. Disconnect the throttle linkage from the throttle body.
3. Disconnect the wiring connectors from the IAC valve and the TP sensor.
4. Remove the screws (3) retaining the throttle body and remove the throttle body from the
adapter. Refer to "Exploded View."
IMPORTANT: Insert a clean shop towel into the opening of the plenum to prevent
foreign material from entering the engine.
CLEANING AND INSPECTION
IMPORTANT: DO NOT use cleaners containing methyl ethyl ketone. It is not neces-
sary for cleaning throttle bore and valve deposits.
IMPORTANT: DO NOT allow the TP and IAC valve to come into contact with solvent
or cleaner.
IMPORTANT: Use care when removing gasket material from plenum and throttle
body. Failure to do so could result in damage to the plenum and throttle body.
1. Carefully remove all gasket material from plenum and throttle body.
2. Thoroughly clean all parts of throttle body. Make certain that all passages are free of dirt
and burrs.
3. Inspect mating surfaces for damage that could affect gasket sealing.
4. Inspect throttle body for cracks in casting.
5. Inspect throttle plates, linkage, return springs, etc., for damage, wear and foreign
material.
6. Check plenum for loose parts and foreign material.
Index
Page 5C-40
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Refer to "Precautions" in this section, BEFORE proceeding.
a - Throttle Cable
b - Throttle Lever
NOTICE
a
b
SERVICE MANUAL NUMBER 23
75454
90-861326--1 MARCH 1999