What is "Auxiliary Port Valve" Cycling?
07-01-2011, 07:25 PM
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What is "Auxiliary Port Valve" Cycling?
I've read posts here saying that:
What does "The valve cycles each time the ignition is turned off" mean exactly?
Just curious, as I've been trying to pinpoint a faint, metallic rattle sound my car makes when in gear, and the curious thing is it seems to temporarily go away (or at least become barely noticeable) after I redline it, or turn the engine off/on (such as when getting gas).
I'm wondering if it's "chattering" until it gets opened/closed... if that's what "cycling" means?
Above 6250 rpm, the Auxiliary Port Valve opens the third or auxiliary intake port for additional airflow. All six ports are now used to increase horsepower and torque. The Auxiliary Port Valve is controlled by an electric motor through gears, a rack and linkage. The valve cycles each time the ignition is turned off to clear carbon. The Auxiliary Port Valve is used on the High Power engine only.
Just curious, as I've been trying to pinpoint a faint, metallic rattle sound my car makes when in gear, and the curious thing is it seems to temporarily go away (or at least become barely noticeable) after I redline it, or turn the engine off/on (such as when getting gas).
I'm wondering if it's "chattering" until it gets opened/closed... if that's what "cycling" means?
07-01-2011, 07:31 PM
#2
That quote is actually a very detailed description of what that valve does.
And "cycling" is just that... when the key is turned to 'OFF', the APV motor cycles the valves fully open and then closed.
If you open your hood and have someone in the car turning the key from 'ON' to 'OFF', you can actually hear the valves cycle.
I usually hook-up a 12VDC supply to the motor to continuously cycle the valves.
And "cycling" is just that... when the key is turned to 'OFF', the APV motor cycles the valves fully open and then closed.
If you open your hood and have someone in the car turning the key from 'ON' to 'OFF', you can actually hear the valves cycle.
I usually hook-up a 12VDC supply to the motor to continuously cycle the valves.
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