What Causes the Abnormal Noise in Audi Q5L?

1 Answers
DeLucas
07/30/25 7:23am
Audi Q5L abnormal noise is related to engine speed. The relationship between abnormal noise and engine speed: The abnormal noise only exists at idle or low-speed operation, the sound becomes chaotic when maintaining a certain speed, short sounds are emitted successively during rapid deceleration, the abnormal noise appears when the engine accelerates rapidly, and the sound still exists when maintaining high-speed operation. Causes of the noise: Excessive clearance between the piston and cylinder wall; Over-tight assembly of the piston pin or connecting rod bearing; Excessive clearance between the tappet and its guide hole; Wear of the cam profile. The relationship between abnormal noise and load: When a cylinder is cut off, the abnormal noise suddenly disappears or reduces. Causes of the noise: Piston knocking; Loose connecting rod bearing; Piston ring leakage; Broken piston pin.
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