No Dwell

[DMC VIN 6639]

I am trying to set dwell but I have no signal at the orange wire. The needle is not moving at all. There is no needle movement when I depress the WOT switch. I have continuity from the orange wire to the pin at the lambda ECU. Dwell meter is new. Engine is warm. I tried 1 other meter. No signal. Does this mean the o2 sensor is not providing feedback? What else could cause this?

[David T]

I am trying to set dwell but I have no signal at the orange wire. The needle is not moving at all. There is no needle movement when I depress the WOT switch. I have continuity from the orange wire to the pin at the lambda ECU. Dwell meter is new. Engine is warm. I tried 1 other meter. No signal. Does this mean the o2 sensor is not providing feedback? What else could cause this?

Do you hear the frequency valve buzzing? Is there power to the ECU?

[DMC VIN 6639]

Do you hear the frequency valve buzzing? Is there power to the ECU?

My FV was not buzzing. Turns out my power wire at lambda relay had fallen off. Once connected the FV was buzzing and dwell woke up but it was not moving. I had to swap out o2 and then dwell was swinging.