I have a EM4-f. I have what i can only describe as a spark drop.
A picture is worth a thousand words.
so here is what is happening.
Blue line much older dyno.
Red line new dyno.
The blue line is actual the Red line is microsoft paint.
Everything is the same.
I have tried everything. New plugs, new wires, New coil pack, Added timing removed timeing, checked and double checked magnet synchronization.
Removed MSD DIS-2.
Air fuel is good at 12.8 steady.
I have gone back to the dyno 4 times now, and this is becoming very expensive!
There are no RPM error codes.
It looks like a knock sensor is turned on.
However there is no knock sensor.
This is a TPS only system. So there is no MAP sensor problem.
All parameters are normal.
This is a naturally aspirated Honda engine.
Any ideas?
