Sounds and symptoms appear regardless of being in motion or a standstill. Doesn't matter if the car is in gear or not. Symptoms don't seem to change whether the engine is cold (fresh start) or already warmed up. Possibly actually worse when warmed up.
There is no RPM change, I can hold a constant RPM in that range without adjusting the gas pedal. There is some valve train noise that is more similar than my 914 than the Cayman, but I could just be getting hypersensitive.
Hasn't thrown an CEL and an ODBII reader doesn't show any misfires or any other codes.
Yeah, didn't have much hope is being able to diagnose a noise issue online, but was a shot to see if anyone else had experienced this given how weird it is.
Regardless, here are things that are going to get checked out:
- coil packs, they're original, so probably EOL of those and should get the updated ones on anyway
- engine/trans mounts
- something wonky with the Varioram actuator (although that should throw a CEL)
- something loose along the intake or exhaust path