Mercury 305 CID, Service Manual, Page: 713 / 967

90-823225--1 1096 5E-172 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
INSTALLATION
IMPORTANT: If installing a new IAC valve, be sure
to replace it with the correct IAC valve pintle
shape and diameter are designed for the specific
application.
1. Install new O-ring on IAC valve.
73766
b
c
d
a
a - Throttle Body
b - Idle Air Control (IAC) Valve
c - O-Ring
d - Screws
2. Install IAC valve in throttle body using screws.
Torque to 20 lb. in. (2 N·m).
3. Connect electrical connector to IAC valve.
73754
a
b
a - Throttle Body
b - Idle Air Control (IAC) Valve
4. Reset IAC valve pintle position after reconnect-
ing negative (–) battery cable.
a. Turn ignition key ON for ten seconds.
b. Turn ignition key OFF for ten seconds.
c. Restart engine and check for proper idle op-
eration.
Knock Sensor
NOTICE
Refer to “Service Precautions,” in “Repair
Procedures,” BEFORE proceeding.
REMOVAL
1. Disconnect electrical connector at knock sensor
located just ahead of starter motor.
73757
a
a - Knock Sensor
2. Remove knock sensor from engine block.