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I understood that the issue was the oil vapor was recirculated and would then build up on the back of the valves. With direct injection there is no flow over the valves to clean them off so it would build up.
With the addition of port injection on the 2.7 part of the air/gas mixture flows through the intake manifold where it can clean the back of the valves as it passes over them negating the need for a catch can.
But I am no expert.. others more qualified will surely pitch in better information.
Also this is a direct injection issue.. not a Ford issue. All direct injection motors have this potential.
I think Toyota also has the direct/port system? Can't remember exactly
With the addition of port injection on the 2.7 part of the air/gas mixture flows through the intake manifold where it can clean the back of the valves as it passes over them negating the need for a catch can.
But I am no expert.. others more qualified will surely pitch in better information.
Also this is a direct injection issue.. not a Ford issue. All direct injection motors have this potential.
I think Toyota also has the direct/port system? Can't remember exactly
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