Stlaurent Mr Steven wrote:
>
> I have both black carbon on the inside of the header pipe and 02 sensor.
>
> --------------------------------------
running a tad rich, check the air cleaner or
try lower octane gas.
>
> a cleaner burning engine will self clean the O2/Cat with
> heat at highway speeds. carbon burns off at 900/950 F
>
> check the outlet (inside pipe) color on the exhaust after
> a decent highway trip and the inside is the same :)
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