PSIG wrote:Please define "jittering like hell". Timing jitter is commonly from a few sources, but could be one or more of many factors. Common ones are incorrect sensor polarity, or incorrect trigger edge setting — or both. The wiring, noise or incorrect settings "confuse" the ECM.
Hmmm i could try to trigger on the rising edge of the signal, maybe that helps.
The jitter is really quite a few degrees. I will have to remount the distributor trigger to shoot a video.
The sensor polarity should be right, as the signal looks fine on the oscilloscope.
PSIG wrote:Other causes can be mechanical, such as the wear and clearances in the distributor drive, or looseness in the points plate or shaft/wheel portion of old advance mechanisms (if equipped).
But that wear should have resulted in bad timing with the points ignition as well, which i didn't have. The advance mechanism is locked out as in wont ever work again with that distributor.
PSIG wrote:Low tooth counts and mechanical drives can cause some loss of accuracy, but "jitter" should be minimal in an 8-tooth distributor. I have seen around 2 degrees (usually less) in a similar 8-tooth setup at low-rpm idle. Less at higher rpm.
Another thing could be that i went for cylinder 1 exhaust stroke, maybe, as i run wasted spark.