I am looking for help with my timing advance. I have just got the Torque app and am reading the data from my Ford Fiesta WS Petrol 1.6L 2010 model. This is the graph here. As you can see, RPM is constant (along with a number of other variables) but the timing advance is jumping up and down. Is this normal behaviour?
I was driving yesterday with cruise control and watching the engine timing advance, and it is dropping 15 degrees almost instantly then going back to the value it was. I feel a gentle jerk when this happens. This is the image of this log while it was happening. Is this normal?