Ignition System Tests - 4.0L: Removal & Installation Jeep Cherokee II

Removal

1. Drain the cooling system.
2. Remove air cleaner assembly.
3. Disconnect the CTS wire connector. (Scheme 234)
4. Remove the CTS from the left side of the engine block.

Scheme 234

Installation

1. Install the CTS to the cylinder block. Tighten the CTS to 21 Ft. Lbs. (28 Nm).
2. Connect the CTS wire connector.
3. Install air cleaner assembly.
4. Fill the cooling system.

1. Disconnect the MAT sensor wire connector. see scheme 18
2. Remove the MAT from the intake manifold.

1. Install the MAT sensor to the cylinder block. Tighten the MAT sensor to 21 Ft. Lbs. (28 Nm).
2. Connect the MAT sensor wire connector.

1. Disconnect the MAP sensor wire connector. see scheme 19
2. Disconnect MAP sensor vacuum supply hose from MAP sensor.
3. Remove the MAP sensor attaching nuts. Remove MAP sensor from the firewall.

1. Install the MAP sensor to the firewall. Tighten the MAP sensor attaching nuts.
2. Connect the MAP sensor vacuum supply hose.
3. Connect the MAP sensor wire connector.

1. Raise and support the vehicle.
2. Disconnect the knock sensor wire connector located below and to the rear of the Coolant Temperature Sensor. see scheme 20
3. Remove knock sensor from left side of the engine block.

1. Install the knock sensor to the cylinder block. Tighten the knock sensor to 89 INCH Lbs. (10 Nm).
2. Connect the knock sensor wire connector.
3. Lower vehicle.

1. Remove engine speed sensor wire connector. see scheme 21
2. Remove the engine speed sensor-to-transmission housing attaching bolts. Remove engine speed sensor from transmission housing.

1. Install the engine speed sensor to the transmission housing with 2 shoulder bolts. Tighten the engine speed sensor shoulder bolts.
2. Connect the engine speed sensor wire connector.

Note. The ECU is located below the instrument panel, between the steering column and the A/C-Heater housing. (Scheme 235) Three screws mount the ECU to a bracket.

1. Disconnect the negative battery cable.
2. Remove the 3 ECU attaching screws. (Scheme 236)
3. Disconnect the ECU wiring harness connector.
4. Remove the ECU.

Scheme 235

Scheme 236

1. Connect the ECU wiring harness connector.
2. While holding the ECU in position, attach the 3 ECU attaching screws. (Scheme 236)
3. Connect the negative battery cable.

Scheme 237

Scheme 238

1. Disconnect the battery negative cable.
2. On vehicles equipped with A/C, remove the electrical cooling fan and shroud assembly from the radiator to allow room to rotate the engine with a socket and ratchet using the vibration damper bolt.
3. Scribe a mark on the distributor housing below the left side (past) the number one spark plug wire post of the distributor cap for reassembly reference for No 1 cylinder firing position.
4. Remove the distributor cap.
5. Turn the engine in a clockwise direction until the rotor is approaching the scribed mark on the dintributor housing. Then slowly turn the engine until the timing mark on the crankshaft vibration damper lines up with zero on the front cover timing scale. (Scheme 237) NOTE: The timing mark is located on the edge of the vibration damper closest to the front cover.
6. Align the trailing edge of the rotor blade with the mark previously scribed on the distributor housing. (Scheme 238)
7. Remove the distributor hold-down bolt and clamp.
8. Remove the distributor from the engine.

Scheme 239

Scheme 240

Scheme 241

1. If needed, use a flat blade screwdriver to turn the oil pump gear shaft until the slot is slightly past the 11 o'clock position. (Scheme 239) The oil pump shaft is located down in the distributor hole.
2. InstalI the rotor.
3. Without engaging the distributor gear into the cam gear and ensuring the distributor gasket is istalled, position the distributor into the hole in the engine block.
4. Visually line up the hold down ear of the distributor housing with the hold down clamp hole. (Scheme 240)
5. Turn the rotor to the 4 o'clock position. (Scheme 241)
6. Carefully slide the distributor into the block until it seats, keeping the hold down ear aligned to the hole in the block.
7. The rotor should be in the 5 o'clock position with the trailing edge of the rotor blade lined up with the mark previously scribed on the distributor housing (number one spark plug wire post location).
8. install the distributor hold-down clamp bolt and tighten to 9.5-14 Ft. Lbs. (13-19 N.m).
9. Install the distributor cap. Connect the distributor electrical connector.
10. Install the electric cooling fan and shroud if applicable.
11. Connect the negative battery cable.

Removal & Installation

Using care, disconnect the spark plug and coil wire boots and wires. Twist the boot one half turn and pull on the boot to disconnect the wire.

When replacing the spark plug and coil wires, carefully route the wires correctly and secure them in their proper channels retainers.

Failure to route the wires properly can cause the radio to reproduce ignition noise, cross ignition of the plugs, or can short circuit the wires to ground.

Scheme 242

1. Remove the distributor as specified in «DISTRIBUTOR R & I»(ref-24456-S30864040322001040200000) under REMOVAL & INSTALLATION above in this article.
2. Remove the distributor rotor.
3. Position the distributor in a vise.
4. Remove the distributor gear from the shaft using a small punch and a hammer to drive out the retaining roll pin. (Scheme 242)
5. Remove the distributor shaft from the distributor housing.
6. Remove the stator retaining screw. NOTE: Mark the location of the stator position for reassembly reference.
7. Remove stator harness by pushing the grommet through the distributor housing. Remove stator assembly. (Scheme 243)

Scheme 243