How to Determine VVT Pulley Abnormal Noise?

[CarmenAnn]

Here are the inspection and handling steps for determining VVT pulley abnormal noise: 1. Abnormal noise occurs when the car is idling or running at low speed. Possible causes include excessive clearance between the piston and cylinder wall; overly tight piston pin or connecting rod bearing assembly; wear of the camshaft profile, etc. 2. Abnormal noise appears during rapid acceleration of the engine. Possible reasons may include loose connecting rod bearings, melted or mismatched bearing shells causing rotation; loose crankshaft bearings or melted bearing shells; broken piston pin; broken crankshaft. Extended information: 1. VVT (Variable Valve Timing) technology is used in automotive piston engines. It refers to controlling the advance and delay of intake valve angles under specific conditions to adjust the intake/exhaust volume and valve overlap angle, thereby increasing intake impulse and efficiency, and improving engine power, torque, etc. 2. If the engine VVT pulley is damaged and produces abnormal noise, the car will experience unstable engine idling and increased fuel consumption, which can also cause certain damage to the engine. Therefore, timely repair is necessary to avoid accidents.