Darrell,
Would a ground strap from the Oxygen Sensor to the left engine head improve the
OS ground path to the ECU?

Darrell Boehler wrote:

> This looks  more like an ECU all the time.  There is one wire from the
> ECU pin 19  to the  left engine head. Measure this wire to make certain it
> is good.  It provides the ground path for ECU O2 sensor circuit. <snip>