I've found an interesting EGT oscillation after hot start that I request the VAF brain trust to opine upon ... This shows up after a hot start during taxi. IO-360-M1B, 30 hrs TTSN, running great in all other respects. The engine broke in nicely during phase 1 and is purring along happily.
I noticed a ~10 second oscillation in EGT after a hot start at low power operations (ie, taxiing back to hangar or departure end after a fuel stop). The plot below shows it on #4, but I've also seen it on all cylinders together (#4 is the most common). This clearly doesn't seem to be the burnt exhaust valve oscillation generated by the rotator cap, but may be due to hot fuel in the spider after a heat soak.
Go fly, and this doesn't ever show up again (until a hot start + taxi ...)
What say you, VAF brain trust?