MSefi.com read only forum (Jan.15,2018)

From what i learned in school, backfires in the intake usually means you're running lean, or your timming is incorrect. when i started my car for the first time with the edis ignition, i placed the crank sensor at the wrong position (6 teeth after the mark, instead of 6 teeh before the mark)

But ...

the original ecu usually don't leave it open all the time while running like you're doing. they usually only open up for a brief time when the conditions are right. I believe its usually when you're decelerating or not giving any load, but not idleing. but that can differ from car manufacturer ...

also high and low impedence injectors don't show the same wave form.

while i was in school, teacher warned me about hooking up a scope to injectors, if you don't wire it up correctly, you'll get strange results. he told me always back probe on the negative side of the injector (after the power traversed the injector) and the other probe of the scope hooked up to ...