[Phoenix7]

there is another similar method that I found while reading the net:
http://www.teamfc3s.org/info/articles/demystifying.html

Now this next discussion is a real diagnostic dilemma. Properly installing a crank angle sensor is pretty straightforward. The eccentric shaft (crank) marks are first lined up, and a mark on the crank angle sensor driven gear is aligned to the crank angle sensor housing. The crank angle sensor is then slid into its bore in the engine. Everything seemed to be okay.

But with the engine running, idle quality and performance could drastically be improved by advancing (turning clockwise) the crank angle sensor. If I advanced the crank angle sensor's position by one tooth, performance was better. A few phone calls to a tech line, two Mazda experts and a little research said I needed to find TDC.

With a new TDC identified, I installed the crank angle sensor. Did it work? I'll let Figure 13 answer that question. Figure 13 is the trailing primary #1 pattern. The spark line is back to normal, as is engine performance. As I mentioned, I've run into this situation twice. I'm still not sure what causes the timing to change in the first place. It must be something in the engine, but what?


Well, I hope I've shed some light on these very interesting ignition systems. While most of us may not see these vehicles regularly, it can be very helpful to have a good understanding of how known good ones work. This knowledge can reduce our diagnostic time drastically. Good luck in your own Diagnostic Dilemmas!