This system uses hydraulically or electronically actuated phasers on the camshafts to alter when the intake and exhaust valves open and close. Unlike older stepped systems, it allows infinite adjustments within a set range. This optimizes cylinder filling across the entire rpm band, improving power output, fuel economy, and emissions.
The scan tool shows the continuous variable valve timing solenoid is stuck advanced, which explains the rough idle.
A clogged oil control valve filter is the most common cause of CVVT failure, usually triggered by neglected oil changes.
Also heard as
- CVVT
Related terms
Variable valve timing
An engine technology that alters when intake and exhaust valves open and close.
Overhead cam
A valvetrain layout where the camshaft is located in the cylinder head above the combustion chamber.
Cylinder head
This cast metal component bolts to the top of the engine block to seal the combustion chambers.