What Causes the Abnormal Noise During Rapid Acceleration in Turbocharged Vehicles?

[ArielAnn]

Turbocharged vehicles may produce abnormal noise during rapid acceleration due to the following reasons: 1. Excessive cam wear causing tappet jumping during operation. 2. Excessive valve clearance due to wear or improper adjustment of the valve stem end and adjusting screw or rocker arm, leading to impact between the rocker arm head and valve top in overhead valves. 3. Excessive carbon buildup in the valve guide. 4. Detachment of the valve spring seat. 5. Damage to the hydraulic tappet or tappet barrel. Additional information: 1. Piston slap noise refers to the abnormal sound produced when the piston side impacts the cylinder wall. Generally, when the direction of axial force on the piston top changes from the compression stroke to the power stroke, piston slap noise occurs. 2. Knocking sound: As the engine temperature rises, the piston clearance decreases accordingly, and the knocking sound will also diminish.