Isuzu engine C22NE / 22LE / 20LE. Service manual — part 107

DRIVEABILITY AND EMISSIONS 6E1-257

AIR INDUCTION SYSTEM

AIR FILTER

Removal

1. Disconnect electrical connector at the IAT sensor.

2. Release the four latches securing the lid to the air

cleaner housing.

3. Remove the air cleaner lid.

4. Remove the air filter element.

Installation

1.

Install the air filter element in the air cleaner housing.

2. Install the air cleaner lids.

3. Secure the three latches, holding the lid on the air

cleaner housing.

4. Connect the electrical connector to the IAT sensor.

IDLE AIR CONTROL (IAC) VALVE

Removal

1.

Disconnect the negative battery cable.

2. Disconnect the IAC electrical connector.

3. Remove the two screws and IAC valve from the throttle

body.

Notice: Do not clean the IAC valve by soaking it in solvent.

The valve will be damaged as a result.

Cleaning and Inspection

•

Clean the IAC valve O-ring sealing surface, pintle valve
seat and air passage.

•

Use carburetor cleaner and a parts cleaning brush to
remove carbon deposit. Do not use a cleaner that contain
methyl ethyl ketone. This is an extremely strong solvent
and not necessary for this type of deposit.

•

Shiny spots on the pintle are normal and do not indicate
misalignment or a bent pintle shaft.

•

Inspect the IAC valve O-ring for cuts, cracks or distortion.
Replace the O-ring if damaged.

6E1-258 DRIVEABILITY AND EMISSIONS

28mm

max.

Measurement

•

In order to install a new IAC valve, measure the distance
between the tip of the pintle and the mounting flange. If
that measurement is 28 mm or less, the valve needs no
adjustment. If the measurement is greater than 28 mm,
apply finger pressure and retract the valve. The force
required to retract the pintle on a new valve will not
damage the valve, shaft or pintle.

Notice: Do not push or pull on the IAC valve pintle on IAC
valve that has been in service. The force required to move the
pintle may damage it.
Important: Use an identical replacement part in order to
replace a valve. IAC valve pintle shape and diameter are
designed for the specific application.

Installation

1. Install IAC valve on the throttle valve body with the two

screws. Tighten the screws to 1 N

⋅m (1.2kgf⋅m).

2. Connect electrical connector to IAC valve.

3. Connect the negative battery cable.

INTAKE AIR DUCT

Removal

1. Disconnect the negative battery cable.

2. Disconnect electrical connector at IAT sensor.

3. Remove the IAT sensor if necessary. Refer to Intake Air

Temperature Sensor Removal.

4. Loosen retaining clamps at the throttle body and at the air

filter box.

5. Disconnect brake booster vacuum hose at intake

manifold and at brake booster.

6. Remove retaining nut at the intake air duct bracket at top

of valve cover.

7. Disconnect the intake air duct from the throttle body and

at the air filter box.

DRIVEABILITY AND EMISSIONS 6E1-259

Installation

1. Connect the intake air duct at the throttle body and at the

air filter box. Make sure retaining hole is inserted to the
intake air duct bracket.

2. Tighten retaining clamp at the throttle body and at the air

filter box.

3. Install a nut to the intake air duct bracket and tighten.

4. Connect brake booster vacuum hose to intake manifold

and to brake booster and secure them with clamps.

5. Install IAT sensor if necessary. Refer to Intake Air

Temperature Sensor Installation.

6. Connect electrical connector at IAT sensor.

7. Connect the negative battery cable.

Important: Use an identical replacement part in order to
replace a valve. IAC valve pintle shape and diameter are
designed for the specific application.

KNOCK SENSOR

Removal

1. Disconnect the negative battery cable.

2. Disconnect pig tail electrical connector at near the top of

generator.

3. Unscrew retaining bolt from Knock Sensor located on the

passenger side of engine block just front of starter.

4. Remove Knock Sensor with retaining bolt.

Installation

1. Install Knock Sensor with retaining bolt. Tighten the

screws to 20N

⋅m (2.0kgf⋅m).

2. Connect pigtail electrical connector.

3. Connect battery negative cable.

6E1-260 DRIVEABILITY AND EMISSIONS

OIL PRESSURE SWITCH

Removal

1. Disconnect battery negative cable.

2. Disconnect electrical connector at Oil Pressure Switch.

3. Unscrew Oil Pressure Switch from Oil Filter Mounting

Housing.

Installation

1. Install Oil Pressure Switch into Oil Filter Mounting

Housing and tighten. Tighten the screws to 30 -50Nm
(3.1 -5.1kgf

⋅m).

2. Connect electrical connector.

3. Connect battery negative cable.