Quote:

now here's a chart to follow use only the red path unless it's past 5pm and you are using 89 pmup.
otherwise the black and race gas


Looks like my daughter got hold of that one w/ a box of Crayons.

I should have mentioned that the reversion I'm talking about is the dilution of the intake charge during overlap when the burnt exhaust gets pushed back up the intake tract after the intake opens, not the effect of the intake valve being left open too long.

As Brian H. mentioned, being a street-driven car there may be no way to really eliminate the issue which (I'm assuming) is happening during low(er) RPM part-throttle operation. The deposits weren't showing up as far back as the intake manifold, but were concentrated above the valve and into the bowl entrance.

Perhaps I should pour a can of BG 44K in the 'Pig once in a while...