How to Replace the Crank Sensor on a 1987 Jeep Comanche

The crank position sensor mounted to the driver's side of the bell housing is responsible for tracking the speed and position of the crankshaft as the engine is running. The information is transmitted to the engine management computer where it is used to alter the ignition timing, fuel map profile and other important parts of engine management. If the sensor is faulty, the engine will run rough or may start hard.

Tools Used: Jack, Jack stands, Socket set, Ratchet

Replace Crank Sensor

Raise the front of your Jeep Comanche with a jack and position a set of jack stands under the front suspension. Lower the jack until the Jeep is resting securely on the jack stands.

Slide under the driver's side of the Jeep and locate the crank sensor on the bell housing at about the 10 o'clock position. Remove the two retaining bolts from the sensor with a socket and ratchet, then remove the sensor from the bell housing.

Follow the wires from the sensor to the wiring harness connector. Depress the locking tab on the connector and separate the two halves of the connector. Discard the old sensor.

Position the new sensor on the bell housing and install the two mounting bolts on the sensor. Tighten the bolts with a socket and ratchet, then plug the wiring harness connector into the connector on the engine.

Raise the Jeep off the jack stands with the jack then remove the stands from under the Jeep. Lower the Jeep to the ground and remove the jack from under it.

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