Flik02

I have an issue that even Mercedes is scratching their heads on.
Above 3k RPM and +80% load, the RIGHT 4 ignition coils will turn off completely (zero electrical signal to the coils). After cycling the key, they will return to normal until those conditions are met again.

-- 2005 CLK 500
-- Below 3k everything is great, full load is fine, etc.
-- No check engine light at all (steady or flashing)
-- MAF is good
-- Fuel system is good, pump, filter, injectors (spray pattern is good), pressure good
-- Coils, plug, wires new/good
-- All sensors have checked good (multi-meter and oscilloscope)
-- There is no visual evidence of water damage to any of the control modules
-- Compression and leak down are good
-- Timing is good, chain is tight, guides are good
-- Transmission does NOT get stuck in gear (limp mode indication?)
-- Mercedes dealership diagnostic tools have revealed nothing useful.

As far as I can tell, everything has been checked and verified good/within spec. The last thing at this point is possibly an issue with the wiring harness, but that seems like it would manifest as an intermittent problem rather than specific parameters. The other idea is that maybe there is an issue with the PCM itself, perhaps programming, or a circuit has gone bad.

Is there a circuit or a protection that is built in that activates above 3k rpm?
Has anyone else ever experienced this issue?

Thanks