Quote:
Originally Posted by Piotrsko
Unburned fuels tend to be like creosote in a wood fireplace. Otherwise how do you get clogged cats? Typical solution is to increase temperatures like a self cleaning house oven.
It is not improbable that this coating could fall off and clog a passage.
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That's really interesting. I did clean the intake and exhaust passages to the extent that I could reach them when I took the head off. And I also cleaned the surfaces of two of the Pistons, those that were easy to reach. But the other two Pistons remain quite dirty. I suppose something could have flaked off there or from somewhere deep within the exhaust manifold that I couldn't reach. At any rate the PO420 code has not yet repeated.