I'm talking about "permanently" setting the engine's ECU to maintain an idle RPM of my choice, say, 1200 or 1500? (by "permanently", I mean something that would be maintained after power cycling)
If yes, do I need a special OBD device? (the basic ones only read and display diagnostic code).
What about connecting a kvaser to the OBD port, with a Linux laptop so that I can manually insert any message of my choice on the CAN (would it be reasonably easy?)