Starting valve ring of automobile cold car

The reason for the "whirring" sound of the cold car: 1. Hydraulic tappet: air enters the hydraulic tappet due to low oil pressure or wear of the hydraulic tappet itself, resulting in "clicking" sound; 2. Valve clearance: the valve rocker arm is worn, resulting in excessive valve clearance; 3. Dirty throttle: Due to the continuous accumulation of sludge and carbon deposits, the throttle is too dirty; 4. Working sound of carbon canister solenoid valve: This is a normal sound and can be used continuously. If the noise is too loud, it is recommended to go to the 4S shop for inspection.