Lincoln 4L3Z-12A699-AA Sensor - Engine Knock

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To remove, disconnect the battery, remove the intake manifold, disconnect the sensor connector, remove the bolt, and remove the sensor. For 2.7L V6 models, two sensors are located between the cylinder banks and must be replaced together. Next, relieve fuel pressure, disconnect the battery, drain the cooling system, remove the water pump and coolant outlet, remove the fuel rails, disconnect the sensor connector, remove the bolts, and remove the sensors.

For 4.2L V6 models, the knock sensor is installed in front of the exhaust port on the engine head, in front of the left cylinder. First, pull the negative wire off the battery terminal. To get to the knock sensor, loosen the single bolt which holds the fuel supply line to the transmission bell housing and pull the line out and upward slightly. Lose the electrical connector from the knock sensor, undo the mounting bolt and then pull out the knock sensor. Installation is in the reverse order with a particular emphasis to tightening the knock sensor to the appropriate torque. For 3.5L, 3.7L V6 and all V8 models the knock sensor(s) are located in the valley between the cylinder heads below the intake manifold, which must be removed to get at. Reduce the fuel system pressure and remove the cable of the negative terminal of the battery. Remove the intake manifold. Undo the electrical connector from the knock sensor by pressing down the locking tab; for 5.4L V8 engines, there are two knock sensors with their related connectors; the 4.6L V8 engines only use a knock sensor positioned at the right cylinder head. This involves the removing of the retaining bolt that holds the knock sensor in place on the engine block the knock sensor is then pulled out. Again, installation is the reverse of removal and it is done with an equal torque on the retaining bolt.

Disconnect the cable from the negative battery terminal.

Refer to Chapter 2A and remove the intake manifold.

Disconnect the cable from the negative battery terminal.