Originally posted by MercuryMystik99:
Burning unburnt gas in the exhaust is already taken care of. It is called your EGR: Exhaust Gas Recirculation. It recirculates exhaust back into your intake to burn the unburnt gas to save a few miles per gallon. Thats what you were thinking of.

FYI: Its also one of the reasons our intake manifolds get so damn dirty.


No it is not.

The reason the manifolds get so dirty is they injest oil from the valve cover vents and PCV system.
Mainly from the vents (at rpm levels above 5k) though as the 2.5L does not drain the heads effectively and raw oil gets sucked into the vents and directly into the intake.

There is no cure for that problem except running a Full 3L engine since it has extra, larger drains to solve that problem and the high rpm oil starvation one as well.

The PCV problem can be curtailed by running a PCV seperator.

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.