[ischmitz]

Hi,

It's very hard to say what we are looking at in your LM-1 graphs. I don't see a load signal (not easy to get with CIS) or an RPM signal. So the A/F ratio alone is not very telling. I wonder what made you think you lost spark?

The load signal would be the vaccum in the intake - you'd need to rig up a sensor. The RPM signal under WOT would show how the A/F behaves a little better. With part throttle you always see very lean conditions once you lift. And I don't think the A/F is a way to determine a bad igntion. Missfires due to lean conditions will look the same as no spark....

In general I wonder what threw the mixture off in the first place on your engine. With CIS you need to check your control pressure, make sure you have absolutely no vaccum leaks and take it from there. And you check the CO level to determine mixture if I am not mistaken. What did you do to adjust your mixture?

The LM-1 wouldn't be my first choice to tune a CIS engine. I'd get the proper CIS gauges. And make sure your timing is corrent and the advance is working properly.

Ingo