So I got distracted for a bit by a steering column once-over.
Before I fire the parts cannon at the ECU, I am trying a couple of things.
I did notice that the tach/miss can happen immediately on start up, which should be in open-loop mode. I'm not clear on which inputs to the ECU can cause the ECU to alter timing, or if any input matters while in open-loop?
I have disconnected the knock sensor and reconnected, no change. I have a new o2 sensor on order, will make same test when I receive it.
Are there any other inputs to the ECU that could cause it to manipulate timing?
MODIS shows timing bouncing about 20 degrees, from 20 BTDC to 40 BTDC at cold idle (80~ish degrees).
Before I fire the parts cannon at the ECU, I am trying a couple of things.
I did notice that the tach/miss can happen immediately on start up, which should be in open-loop mode. I'm not clear on which inputs to the ECU can cause the ECU to alter timing, or if any input matters while in open-loop?
I have disconnected the knock sensor and reconnected, no change. I have a new o2 sensor on order, will make same test when I receive it.
Are there any other inputs to the ECU that could cause it to manipulate timing?
MODIS shows timing bouncing about 20 degrees, from 20 BTDC to 40 BTDC at cold idle (80~ish degrees).
