Poor ignition performance can be confusing when using the LM-1
air/fuel-ratio meter. When a cylinder misfires, the air and fuel do not
combust, meaning the oxygen in the air moves into the exhaust where the
O2 sensor will immediately pick up the additional air and indicate a
lean condition.

Simply stated this means a dead cylinder or occasional
misfire will show up on the Innovate meter as a lean condition, not a
rich mixture as you might think. Fix the misfiring cylinder(s) and the
air/fuel ratio will read as a richer mixture.