Return to Question

So a friend asked me to look at a Taurus at his shop. The car originally came in for a P0420 code and they put an anti-fouler on the rear o2 sensor. Whatever.

So a friend asked me to look at a 3.0 L Taurus at his shop. The car originally came in for a P0420 code and they put an anti-fouler on the rear o2 sensor. Whatever.

So a friend asked me to look at a Taurus at his shop. The car originally came in for a P0420 code and they put an anti-fouler on the rear O2 sensor. Whatever.

At this point I'm leaning towards replacing the alternator, and I tell my friend as much. But it bugs me.

If the wiring to the PCM is OK (I have no reason at this moment to think that the PCM is the cause) and the alternator is in default charging mode. Why would it not be able to respond to changes in RPM and load? Maybe the regulator is stuck in default mode? It's a possibility and testing thus far is making me lean towards this.

So a friend asked me to look at a Taurus at his shop. The car originally came in for a P0420 code and they put an anti-fouler on the rear o2 sensor. Whatever.

At this point I'm leaning towards replacing the alternator, and I tell my friend as much. But a it bugs me.

If the wiring to the PCM is OK (I have no reason at this moment to think that the PCM is the cause) and the alternator is in default charging mode. Why would it not be able to respond to changes in RPM and load? Maybe the regulator is stuck in default mode? It's a possibility and testing thus far is making me lean towards this.

I believe that the system sees a low ignition voltage and is attempting to raise it by commanding the 50% DC. Idle is then jumping accordingly.

So a friend asked me to look at a Taurus at his shop. The car originally came in for a P0420 code and they put an anti-fouler on the rear o2 sensor. Whatever.

At this point I'm leaning towards replacing the alternator, and I tell my friend as much. But a it bugs me.

So a friend asked me to look at a Taurus at his shop. The car originally came in for a P0420 code and they put an anti-fouler on the rear O2 sensor. Whatever.

At this point I'm leaning towards replacing the alternator, and I tell my friend as much. But it bugs me.