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Nope, pretty much out of the blue. It never overheated that I'm aware of (wife's daily driver) so I'm left to assume it just "happened." It did...
Welp, after new plugs and coils it started knocking on startup again after about an hour. I finally let it warm up nice and hot in inspection...
I haven't seen those as a possible cause yet, but I will give that a shot. Going to pick up an inspection camera and look for signs of blown head...
Yup that was it.... New plugs and coils didn't fix my problem though. :( ICE startup knocking/misfire. It went away for about an hour but...
OK, so go to change the plugs. Ugh, don't have a 14mm plug socket, but I can at least get the coils out until I do. BZZZT. How do these...