Toyota VVT-i System Explained. Why do I hear knocking noise when I start my car?

Objective of this video presentation: 1. How VVT-I works? Topics about VVT-i controller construction and Camshaft timing oil control valve operation. 2. Actual reading of VVT-I live data using OBD2 scanner Topics on how to monitor VVT-i operation using four inputs parameters below: Ignition Timing Advance ( based on Crankshaft ) Throttle Position Target angle of Intake Camshaft (ECU Set Point) Actual angle of Intake Camshaft Please also watch the following playlist    • Topics about CARBURETOR      • Topics about BRAKES      • Topics about STARTING SYSTEM      • Topics about CHARGING SYSTEM      • Topics about TRANSMISSION      • Topics about ELECTRICAL WIRING      • Topics about TIMING/VALVES/PCV/EGR      • Topics about FUEL SYSTEM      • Topics about COOLING SYSTEM      • Topics about Suzuki Multicab General Repair      • Topics about Toyota AVANZA General Repair      • Topics about life adventure in the province