2001 V70XC - Noticeable loud pop before ignition

[xHeart]

Reading Throttle body cleaning issues EPIC Volvo saga...RESOLVED!! thread reveals following:

I don't know how cleaning a PCV can go to broken flywheel (actually flywheel is the wrong word unless it's a manual car, it's called a driveplate for auto cars) It has notches on it that the crank sensor references as normal engine rotation and therefore gives pulse to injectors, etc. Perhaps with the areas that were read by the crank sensor being damaged it was giving poor pulse to injectors resulting in varying idle and backfires.

But why no 12V to ETA? Perhaps the flywheel was resting at an area that it couldn't reference at the time and this was cutting power to ETA? Perhaps if the engine was rotated by hand it would have provided power to ETA? Who knows......

I was looking for broken tooth at the driveplate while the oil pan was off. Only a 1/4 was visible. May be next time I'll rotate the crank to go through the full plate.