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Re: 1990 Honda Civic 1.5L TBI
Posted to Emissions Forum on 7/24/2015

Feels like a lean misfire with high CO and NOX. Cat is trying to use up all the oxygen working hard to correct exhaust.

I would start by looking at the mechanical timing, with timing belt off a tooth or so. The Distributor all the way on advanced side may be... Login to read more.