Mopar 68166540AA Knock Sensor

On 2.4L engines, remove the intake manifold (2014 and earlier) or the exhaust manifold (2015 and later). Disconnect the electrical connector(s) from the knock sensor(s). Remove the mounting bolt(s) and detach the sensor(s). Installation is the reverse of removal. Tighten the knock sensor to the specified torque.

The knock sensor for V6 engines is positioned on top of the block, nestled in the valley between the cylinder heads, beneath the intake manifold, with 3.6L models utilizing two sensors: There are knock sensor 1 at the front and knock sensor 2 at the rear of the vehicle. To 2.7L and 3.5L engines, the first procedure includes releasing the fuel pressure and then, the loss of the battery cable connection. In 2.7L and 3.6L engines, it is necessary to disassemble both the upper and the lower intake manifolds, in case of the 3.5L engines, the upper intake manifold has only to be dismantled. For the 2007 and pre-2008 2.7L engines it is necessary to remove the right cylinder head and for 2008 and post 2008 2.7L engines it is only necessary to disconnect the hoses and water outlet tube which is located beneath the intake ports on the cylinder heads to the knock sensors. In 3.6L engines, it is recommended that oil filter housing should be removed. Remove the electrical connector from the knock sensor and for 2007 and earlier 2.7L engine models, unscrew the sensor from the cylinder head while for 3.5L and 3.6L model remove the mounting fastener to pull out the knock sensor or sensors. The mounting bolts used for knock must not be over or under tightened because they directly influence the performance of shock absorbers and the capacity of the PCM to control sparks. Installation is reversed in the order of removal and thus maintaining the right torque on the knock sensor/fastener. The knock sensors are installed for the V8 engines on two sides of the block and below the exhaust manifold. Shove the front of the vehicle up on jackstands and take off the galvanized heat shield that covers up the knock sensor. Unplug the electrical connector of the knock sensor, take out the bolt and the sensor. All the foam strips located on the mounting bolt threads are meant for tight fixation of the bolt during assembly, there is no need to apply any adhesive or sealant. Likewise, do not overtighten or loose the mounting bolts for the effective working of the sensor or overtorque while re-tightening.

The computer receive inputs from information sensors which provide it with the current operating conditions of the engine in a bid to adjust the air/fuel mixture, ignition time and the idling speeds in order to have a proper drive ability, lower emissions, as well as having a better gasoline economy. Exhaust oxygen sensors, built in the exhaust manifold or pipe, deliver variable voltage depending on the content of oxygen in the exhaust, which allows the computer to better set the fuel/air mixture. The older models may have just one sensor while the latest models come with multiple sensors located before and after the catalytic converters, with the intent being to check on the efficiency of the converters. Some tasks are better handled by a professional, getting to inspect the oxygen sensor being one of them. For replacement, apply spray lubricant on the sensor, then turn off the electrical connector and then use right tool to unlock it, and also on the threads when screwing it back apply anti seize paste. There are knock sensors that read the detonation of an engine, and their locations also vary depending on the model of the engine and the year of its manufacture, and changing them also require a technician. It measures the temperature of the coolant and is placed in a number of locations depending on the kind of engine; it has to be replaced in such a way that it doesn't spill much coolant. The manifold absolute pressure sensor, that measures the pressure arising from the intake manifold, may be located near the throttle body or on the firewall and the replacement of the sensor requires inspection of vacuum hoses and of electrical connections. The inlet air temperature sensor that relays this information to PCM is commonly located in the intake manifold, or in the air intake hose and replacing them must be done carefully to avoid ruining the sensor. The Throttle position sensor is located at the carburetor or throttle body and measures the movement of the throttle and therefore should best be evaluated by an expert in case of problems. The Crankshaft Position Sensor which is responsible for the correct timing of the engine is mounted either on the transmission bell housing or on the engine and changing it means that one has to align it properly and sometimes requires a relearn procedure. Distance sensors are used to measure the speed and pass a voltage signal to the computer; it can be replaced at the rear or the transfer case. The camshaft position sensor is also used to time the fuel injection system in conjunction with the crankshaft position sensor, and the former may be located differently or replaced in a different manner depending on the model of the engine. The accelerator pedal position sensor in newer models is integrated with the pedal assembly, which means that the whole assembly has to be replaced if is not working.

To disconnect the knock sensors, disconnect the cable(s) from the negative battery terminal(s). For the 3.6L V6, remove the intake manifolds and disconnect the electrical connector before removing the sensor(s) mounting bolt(s). Finally, install the knock sensor(s) by reversing the removal process.