1) All that carbon in #1 and good amount in #6 were causing the pre-ignition due to volume reduction and also the carbon glowing and firing the fuel (what used to cause "run on" in older cars with carbs). Perhaps it's burned off, I'll change the plugs soon and send the boroscope down again.
2) The computer was still "learning" after being disconnected for a week perhaps?
Anywho, for now I don't hear it anymore. I'm going to treat it to a tank of higher octane, I'm sure it doesn't have that in there now.
Decided we're going to keep it a while longer and see how it holds up. Replacing the upper torque rode today (seems similar disaster as my XC70 had). Looks like an easy job, may wait a bit and order a new upper engine mount since they are in the same location. The torque rod has been busted for a while I'm sure, I'm going to guess the engine mount isn't much better due to the movement and age.
While checking out the car last week for coolant leaks, I noticed what I'm pretty sure is a tranny cooling line with a small dribble coming out of it. I'll have to consult your list, but I first want to be sure it's not oil from somewhere else moving along the path and dripping off from there. More to come!
