Subaru Intake Valve Control Solenoid. When on and off pulse widths become equal, the solenoid valve stops oil pressure flow to fix the intake. The longer pulse width advances valve angle.
P0028, intake valve control solenoid question (updated with pic) hi, my wife's car (2008 impreza 2.5i) recently had a p0028 cell come on. On this system the intake valve lift is varied by two different cam lobes. This system controls the intake camshaft to provide the optimal valve timing.
