Quote:
Originally Posted by jakobnev
Actually, the notion of the ECU undoing your changes is a myth, it couldn't possibly, it doesn't even know you have made any! The reason the car must be put in test engine mode is that it fixes the timing to a certain value, in normal mode the timing might be all over the place, making it impossible to adjust meaningfully with a light.
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Well, all I can tell you is what I experienced: if I reset the timing without jumping the ECU, the computer switched it back. If I recall properly, I just about watched the pulley move back to stock timing. But when I jumped the ECU before adjusting the timing, the Ultra Gauge showed still showed no change in timing at warm idle (12* BTDC), but the pulley showed the advance and it stayed advanced. I originally did this process back in May or June, so my memory of the ECU's adjustments might be flawed, but that's what I recall. It was quite frustrating until I figured out the importance of the jump.