Jeep Cherokee

 Service Manual

Ignition system » Description and operation
Distributor-2.5L engine

DESCRIPTION

The 2.5L engine is equipped with a camshaft driven mechanical distributor (Fig. 1) containing a shaft driven distributor rotor. The distributor is also equipped with an internal camshaft position (fuel sync) sensor (Fig. 1).

Fig. 1 Distributor and Camshaft Position Sensor- 2.5L Engine

1 - SYNC SIGNAL GENERATOR
2 - CAMSHAFT POSITION SENSOR
3 - PULSE RING
4 - DISTRIBUTOR ASSEMBLY

OPERATION

The distributor does not have built in centrifugal or vacuum assisted advance. Base ignition timing and all timing advance is controlled by the Powertrain Control Module (PCM). Because ignition timing is controlled by the PCM, base ignition timing is not adjustable.

The distributor is locked in place by a fork with a slot located on the distributor housing base. The distributor holddown clamp bolt passes through this slot when installed. Because the distributor position is locked when installed, its rotational position can not be changed. Do not attempt to modify the distributor housing to get distributor rotation.

Distributor position will have no effect on ignition timing. The position of the distributor will determine fuel synchronization only.

All distributors contain an internal oil seal that prevents oil from entering the distributor housing.

The seal is not serviceable.

Ignition system

Distributor-2.5L engine

Spark plugs

Spark plug cables-2.5L engine

Ignition coil-2.5L engine

Ignition coil-4.0L engine

Crankshaft position sensor

Camshaft position sensor-2.5L engine

Camshaft position sensor-4.0L engine

Ignition switch and key lock cylinder