Isuzu engine C22NE / 22LE / 20LE. Manual — part 111

DRIVEABILITY AND EMISSIONS 6E1-273

10. Remove the gaskets from the intake manifolds.

11. Remove the IAC. Refer to Idle Air Control Valve Solenoid

Removal Procedure.

12. Remove

TPS.

Refer to Throttle Position Sensor Removal

Procedure.

Inspection

Notice: Do not use solvent of any type when you clean the gasket
surfaces on the intake manifold and the throttle body assembly.
The gasket surface and the throttle body assembly may be
damaged as results.

1. If the throttle body gasket needs to be released, remove

any gasket materiel that may be stuck to the mating
surfaces of the manifold.

2.

Do not leave any scratches in the aluminum casting.

Installation

1. Install IAC valve onto the throttle body. Refer to IAC valve

Installation Procedure.

2. Install TPS onto the throttle body if necessary. Refer to

TPS Installation Procedure.

3.

Place the gasket then the throttle body on the manifold.

4. Install four mounting bolts. Tighten the throttle body

mounting bolt to 13.5 N

⋅m (1.4kgf⋅m).

5. Connect coolant line and secure them with clamps.

6. Connect all vacuum hoses and secure them with clamps

if necessary.

7.

Install accelerator control cable bracket onto the throttle
body.

8. Connect accelerator control cable to throttle plate.

9. Connect al connector at IAC valve and TPS.

10. Install the air intake duct. Refer to Air Intake Duct

Installation Procedure.

11. Fill the cooling system with required coolant. Refer to

Engine Cooling System.

12. Connect the negative battery cable.

6E1-274 DRIVEABILITY AND EMISSIONS

ELECTRONIC IGNITION SYSTEM

IGNITION COIL

Removal

1. Disconnect the negative battery cable.

2. Disconnect the all connector from the ignition control

module.

3. Remove the three attaching screws.

4. Remove the ignition control module from the engine

block.

Installation

1. Fasten the module to the engine block with three screws.

2. Reconnect the all connector.

3. Reconnect the negative battery terminal

IGNITION COIL

Removal

1. Disconnect the negative battery cable.

2. Disconnect all four spark plug cables from the coil.

3.

Disconnect al connector from the ignition coil.

4. Remove three mounting bolts from the ignition coil.

5. Remove the ignition coil from the bracket.

Installation

1.

Install the ignition coil onto the bracket with three
mounting bolts.

2. Connect al connector at the ignition coil.

3. Connect spark plug cable to the ignition coil.

4. Connect the negative battery cable.

DRIVEABILITY AND EMISSIONS 6E1-275

SPARK PLUGS

Type: RN9YC4

Spark Gap: 1.0-1.1 mm (0.039" - 0.043")

Spark Plug Torque: 25N

⋅m (2.5kgf⋅m)

Removal

1. Disconnect the negative battery cable.

2. Remove the spark plug cable.

3. Remove the spark plug.

Inspection

1. Check the insulator for cracks. Replace the spark plug if

cracks are present.

2. Check the electrode condition and replace the spark plug

if necessary.

If the spark plug electrodes and insulators are fouled with carbon
or oil, the engine will not operate efficiently.
There are a number of possible causes:

•

Fuel mixture is too rich.

•

Oil in the combustion chamber.

•

The spark plug gap is not set correctly.

If spark plug fouling is excessive, check the fuel and al system
for possible causes of trouble. If fuel and al system are normal,
install spark plugs of a higher heat range which have the same
physical dimensions as the original equipment spark plugs.
The following symptoms are characteristics of spark plugs that
are running too hot:

•

Fuel mixture is too lean.

•

Heat range is incorrect.

If vehicle usage does not conform to normal driving conditions,
a more suitable spark plug may be substituted.
If fuel and al system are normal, in most cases of this sort, the
problem can be corrected by using a colder type spark plug
with the same physical dimensions as the original equipment
spark plug.

3.

Check the gaskets for damage and replace if necessary.

4. Measure the spark plug gap. The specification is 1.0 to

1.1mm (0.039 to 0.043").

5. Adjust the spark gap by bending the grounded electrode.

6E1-276 DRIVEABILITY AND EMISSIONS

Installation

1. Tighten the spark plug to the 25N

⋅m (2.5kgf⋅m).

2. Push the spark plug cable in until it snaps in.

SPARK PLUG CABLES

The cable contains a synthetic conductor which is easily
damaged. Never stretch or kink the cable. Disconnect the
cable from spark plug and the ignition coil.
The original equipment cables and the ignition coil are marked
to show correct location of the cables. If spark plug cables or
the ignition coil are replaced previously, before cables are
removed from the ignition coil, mark the cables and the coil so
they can be reconnected in the same position.

Inspection

Notice: Never puncture the spark plug cable's insulation with a
needle or the pointed end of a probe into the cable. An
increase in resistance would be created which would cause the
cable to become defective.

1. If the cable has broken or cracked insulation, it must be

replaced.

2. If the terminals are corroded or loose, the cable must be

replaced.

3. Check that the cable resistance does not exceed #1 cyl.

4.7 k

Ω, #2 cyl. 3.9 kΩ, #3 cyl. 3.4kΩ and #4 cyl. 3.1kΩ.