Valve timing determines when and how long the intake and exhaust valves open and close. This technology helps to provide smoother idling and is used to improve fuel economy, emissions and vehicle performance. SKP VVT solenoids are made to strict OE specifications to ensure a superior tolerance, yielding much more stable sprocket operation that requires less correction from the vehicles powertrain control module in order to maintain the commanded of our VVT solenoids undergo 100% end of line testing to ensure that quality meets or exceeds OE specifications.