“MIVEC” usually refers to Mitsubishi Innovative Valve timing Electronic Control—Mitsubishi Motors’ variable valve-timing system. Here’s a quick rundown: • Purpose: Adjusts the timing and lift of the intake (and sometimes exhaust) valves to improve performance, fuel efficiency, and emissions. • How it works: At lower RPMs it favors fuel economy and torque; at higher RPMs it switches to a more aggressive cam profile for better power. • Common models: Found in many Mitsubishi engines such as the 4G