boldguy

So i got the ALDL- USB cable and the TTS datamaster program and i neen to know what a few things mean. What in the hell is the "COP2<52 ms"??? ive been looking and looking but nothing.
Also i noticed the spark advance at idle was all over the place jagged like.

thanks
boldguy

ULTM8Z

I can answer the second part... the reason for the erratic spark timing is that the ECM is making adjustments to the timing to keep idle speed steady. There's a table within the $8D calibration that can zero this adjustment out if you wish.