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JWL · 10-29-2019, 03:34 PM

One of the big culprits causing the problem Lawrie mentioned is using the engine "coast down" as a method of braking. The crankcase pressure can push oil up the guides/valves and into the port. Most of my experience has shown the accumulation of carbon on the valves, rather than the ports.

There is also something to be said for valve timing, but that is a big subject and might not be associated to your problem..

10-29-2019, 03:34 PM	#7
JWL Member Emeritus Join Date: May 2010 Location: Fitzgerald, Georgia Posts: 2,204	Re: Carbon build up inside intake bores? One of the big culprits causing the problem Lawrie mentioned is using the engine "coast down" as a method of braking. The crankcase pressure can push oil up the guides/valves and into the port. Most of my experience has shown the accumulation of carbon on the valves, rather than the ports. There is also something to be said for valve timing, but that is a big subject and might not be associated to your problem..