|
Ok so had a bit of time today to play around with a few things.
First the 35 Degree switch. I was able to reach in the back an clamp on a test lead to the electrical connection. With the car cold I had no continuity from the connection to ground, after the car was warm I did have continuity to ground. This would make the switch normally open, which I believe is correct.
Second, frequency valve duty cycle. I have played around with this in the past and have always had mixed results. Figured I would try again. Took the car for a short drive to get some heat in it, surging started once the 15 Degree switch was activated, Heading back home to connect a scope. On initial connection the duty cycle showed a pretty steady 48% (Seems like this is the open loop default), after 4-5 min of idling, I was getting some fluctuation from the duty cycle, dropping to around 30% and bouncing back to 48%. If I added a bit of RPM while watching the duty cycle you could actually hear the engine fluctuating up and down as the duty cycle changed. I tried to make small adjustments to the mixture screw but couldn't get the duty cycle to change much at all. In the end I left the O2 sensor disconnected and set idle AFR to around 14.5.
Third, I disconnected the O2 sensor and verified voltage coming from the sensor with a volt meter, I was seeing a pretty steady .8 VDC. I was expecting more movement.
|