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Re: Incorrect Timing Causing Reversed Fuel Trims?
Posted to Technical Theory Forum on 8/2/2018

A plugged catalyst on one bank will not do that. The trims will become progressively worse, (leaner) on the 'open' bank, vs. the clogged bank, as the load goes up. Timing, with opposing trims will stay pretty much the same even as the load goes up. Login to read more.