billr wrote:Looking a the .msl I have two questions: I see the TP "marker" spike at about 5.5 seconds, but nothing just preceding that which would indicate a misfire. The posted screen-shot looks (to me) like it is the TP and PW right at the time the marker is made, but doesn't really relate to the misfire event. Is there some logged parameter that clearly indicates misfire? I'm guessing only a knock sensor could do that, but don't see how to display that signal. The other question relates to spark advance. I see several points (74,85,101,103,107,110, and 116 seconds) where the advance makes a "step change" when things like rpm, MAP, PW, and TP are all relatively constant. What could make advance do that? I admit, these questions are as much about helping me as the OP, but maybe they will help...
The advance does the downsteps because IDLEADVANCE became activated (2s after TP below 1.3%) at those points.
The real "misfire" happen in the log at 4.405s as it can be seen in the AFR change as well. At that point with constant TP I have noticed a hesitation from the engine and right after the event I made the mark by 100% TP to find the event easier in the log.
(Is there any other way to create markers in the log while logging- I mean any button etc.?)