AFR ERRATIC. ANY THOUGHT?

Swies,

The AFR will react to the o2 sensor "hunting" and it should swing back and forth. Especially at a cruise with a target of 14.7 Stoich. At idle it should go fronm 14.2 to 15.2 approx., at WOT is should be at a steady state to let's say 12.5 as the ecu is now in open loop and not trying to meet stoich 14.7. You should have a Bosch type on wide band sensor with a harness which plugs into a receptacle to you gage or other device then to the gage.

FYI,

Marion