Question about 1992 Jeep Cherokee Briarwood

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Where is the knock sensor located on my 92 Jeep Cherokee 4.0L straight 6 4WD?

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  • techon707 Sep 30, 2010

    I'm wide open to suggestions for trouble-shooting, and appreciative in advance of any assistance or guidance.



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I don't see the knock sensor on the 4.0L engine. --- COMPONENT LOCATIONS Fig. 1: Electronic engine control component locations - 2.5L engine shown Where is the knock sensor located on my 92 Jeep - 91074g07.gif
Fig. 2: Overhead view of the (A) automatic idle speed motor, (B) MAP sensor, (C) crankshaft position sensor wiring harness, (D) air temperature sensor, and (E) throttle position sensor - 1992 Cherokee with the 4.0L engine shown 91074p15.jpg
Fig. 3: Electronic engine control component locations - 4.0L engine shown 91074g08.gif
Fig. 4: Electronic engine control component locations - 5.2L and 5.9L engines (Part 1Where is the knock sensor located on my 92 Jeep - 91074g05.gifrel='nofollow' href="">91074g05.gif
Fig. 5: Electronic engine control cWhere is the knock sensor located on my 92 Jeep - 91074g06.gifations - 5.2L and 5.9L engines (Part 2 of 2) 91074g06.gif
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Posted on Sep 30, 2010

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  • techon707 Sep 30, 2010

    I haven't been able to locate it on any diagrams, either. However, O'Riley's lists it as an available part. Having replaced the throttle position sensor, intake air control, and crank position sensor and still having the "runs two seconds then stops" problem, I'm looking for any clue. Got fuel presure, fuel pump runs... I'm at a loss... A mechanic friend suggested unplugging the knock sensor on the whim it might be adjusting the timing way out of wack (?)

  • Duane Wong
    Duane Wong Sep 30, 2010

    OK, sometimes parts are listed for cars or light trucks erroneously, so I wouldn't base the thought of whether the engine has it or doesn't have it on that alone. If one looks at the Electronic engine control component locations and it is not listed, then I would go by that before a parts lists at a parts store.

    I've encountered many errors from parts lists at parts stores before, and trust the Chilton or Haynes manuals more than that, since they are based on a complete tear down and rebuild.

    On Fig. 3, I do not see it, so I don't think it has it, based on that reference.

    It is true, that if there is a knock sensor, that once the engine is up and running, that the timing can be advanced 15 deg. or so causing a driveability problem if not working correctly. But, I don't think it applies for an engine that runs 2 seconds then stops from the beginning.

    I would keep searching, though, if that's what you think it is.

    Good luck on this repair.


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I have a 92 jeep with a 4.0 engine. when I drive on the freeway and then decelerate at off ramp, I get a loud knocking sound from the back of the engine and the engine starts to stall out. While driving around town this doesn't happen. I also have the knocking sound at start up briefly and when the engine is warm sitting at stop light sometimes. Could it be the knock sensor? If so where is it located?

Posted on Apr 25, 2011


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Posted on Jan 02, 2017

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SOURCE: where is the knock sensor at

Located on side of engine block.

Posted on Feb 25, 2010

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Location of knock sensor?

Look under exhaust manifold on drivers side, closer to rear of engine, mounted on engine block.

Keep in mind that the knock sensor is a tuned piezoelectric crystal transducer that is located in the cylinder head. The knock sensor provides the MCU with an electrical signal that is created by vibrations that correspond to its center frequency (5550 Hz). Vibrations from engine knock (detonation) cause the crystal inside the sensor to vibrate and produce an electrical signal that is used by the MCU to selectively ****** the ignition timing of any single cylinder or combination of cylinders to eliminate the knock condition.

This and other details can find in the Grand Cherokee Service Manual.

Good luck (remember rated this).

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Where is the knock sensor at

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