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The end of the story - I did replace both pre-cat oxygen sensors. Rich/gas smell with cold ignition now gone. All that remains is the smell from removing two-thirds of the CAT capacity, as it should be. Also, oil analysis came back from Blackstone showing no measurable fuel level in the oil.
Last edited by CamasM3e93; 01-23-2021 at 07:14 AM..
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