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Methods for diagnosing Bare Engine noise

2025-05-27

(1) When this noise occurs, the Bare Engine can be idle and tested cylinder by cylinder. Then, the throttle is shaken from idle to medium speed, and a "click" sound can be clearly heard when the throttle is shaken.

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In the stop-fire test, there is an obvious cylinder-up phenomenon, and the noise can be sensitively restored at the moment of re-firing, which can determine the noise of the large cylinder Bare Engine.

(2) During the driving of the vehicle, if the throttle is increased, a tiny "click" sound can be heard, and when the throttle is reduced or the load is reduced, the noise can be reduced or disappear, which is usually the initial sign of Bare Engine noise.

If the sound of the Mitsubishi Engine is suddenly heard during the driving of the vehicle, it seems to be the sound of drilling on hard steel with a large drill without lubricant, which is usually the sound of burning bearing oil shortage. When this noise occurs, the bearing may be burned and seized.

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