You wouldn't want to watch 18 hours of me slogging through this in the July heat. I'm hoping this is a simple case of one molded piston that's disintegrated, but that doesn't make the project any less involved. While I have the powertrain out I'm going to replace the timing chain guides and a leaky valve cover seal. Also, GM used what I would call "biodegradable" wire loom during this era (2008 Pontiac G6) - it literally crumbles when you touch it so I'll probably replace a bunch of that while it's easy to get to.
Yes, you're not imagining it - I've had a couple "funky" hot / warm starts, and a couple instances of the erratic dwell lookup. Ironically, I think I figured out what the issue is this morning during warmup (i.e. when it switches to the high temp coolant table). I probably won't have time to find the exact problem for a few days but I'll do my best.
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