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Old 04-08-2019, 11:29 AM   #71 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 5,038

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 59.27 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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Originally Posted by Piotrsko View Post
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.
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.


See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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