Cam actuators are electrically operated from the PCM the PCM tells the actuator whether to advance or retard depending on rpm and TPS as well as other sensors. It retards at idle then advances as rpm's go up in order to get more power form the engine. Misfires can be caused by any sensor as well as injector/plug/wiring/coil problems as well as any other engine problem like low compression etc. Dealer mechanics can be wrong as well as anyone else as they are not infallible. If you have the auto parts scanner it cannot do what a pro style one can. At no time should an actuator be activated due to a blade inside will mess up and the actuator will have to be replaced. Your problem could very well be the chain stretch as well as at lest the one actuator. Enclosed is the actual actuator description and operation.
Camshaft Position (CMP) Actuator System
The camshaft position (CMP) actuator system is an electro-hydraulic operated device used for a variety of engine performance and operational enhancements. These enhancements include lower emission output through exhaust gas dilution of the intake charge in the combustion chamber, a broader engine torque range, and improved fuel economy. The CMP actuator system accomplishes this by changing the angle or timing of the camshaft relative to the crankshaft position. The CMP actuator simply allows earlier or later intake and exhaust valve opening during the four stroke engine cycle. The CMP actuator cannot vary the duration of valve opening, or the valve lift.
During engine off, engine idling conditions, and engine shutdown, the camshaft actuator is held in the park position. Internal to the CMP actuator assembly is a return spring and a locking pin. During non-phasing modes of the camshaft, the return spring rotates the camshaft back to the park position, and the locking pin retains the CMP actuator sprocket to the camshaft. The park position for the CMP actuator and camshaft is 8.5 degrees before top dead center (BTDC), which is equal to 17 crankshaft degrees BTDC. The engine control module (ECM) can only command the CMP actuator to retard the valve timing from the park position, or advance the valve timing back to the park position. The total range of valve timing authority is approximately 20 degrees of camshaft rotation, which is equal to 40 degrees of crankshaft rotation
Sunday, February 2nd, 2014 AT 9:36 AM