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International Automotive Technicians Network
Re: Failed Smog Test
Posted to Technical Discussion Forum on 3/7/2020

MAY be too lean. Borderline misfre, or exhaust leak will also raise the idle o2 readings...when RPM increases and exhaust gas volume/pressure raises, You can have an exhaust leak vanish because the additional exhaust reverses the leak to an exhaust pressure es... Login to read more.