All,
I bought an analog Actron dwell meter and am trying to use it to test my O2 sensor / freq valve. When I connected it to the OXS wire and let the engine warm up, I get a 0 reading on the dwell.
I verified that the thing does work, as it can measure voltage (14v) from the fuses while car is running. I know there have been some issues with some of the Actron units. This is the unit I have:
http://www.summitracing.com/parts/anm-cp7605
I couldn't find the test port, because I couldn't find a clear picture of it. I did see that there's a three-prong female port, but I think that goes to a voltage regulator my car doesn't have (mine's instead internal to alt.)
The harness for the OXS is sufficiently ragged that I could clip the test lead directly to the male end of the wire connector, while leaving the wire itself connected. I get 0 dwell and, concerningly, 0 voltage from that wire.
Below is a pic of my setup. The green test lead can be seen at the bottom of the first pic, connected to the OXS wire. What am I doing wrong, or what should I look for next?
PS - car surges rhythmically at idle between 950 and 1100-1200, which is leading me to think some kind of frequency issue.
https://www.icloud.com/sharedalbum/#A25yeZFhvcMhV;6197585D-F6A8-43A5-B63C-774BAC0A7D1A