[riverman]

I have a 2016 Odyssey. The VCM (Variable Cylinder Management system) works seamlessly and effortlessly. Its operation is only detectable on a vacuum gauge - you can't feel it cutting in and out. I see that these Muzzlers work by making the PCM (engine computer) think the engine temperature is colder than it really is, which deactivates the VCM system. The outside air temperature may also affect the VCM system operation. As discussed above, the engine idle speed, as well as the VCM system, is related to the water temperature sensed by the PCM.

I wonder what else is affected when the engine temperature sensed by the PCM is not up to its programmed operating temperature? Anyone know about this?

Then, there should be another way to deactivate the VCM system. My preference would to deactivate the system electrically/mechanically, then trick the PCM into sensing that the VCM is operating properly.

This can be done with replacement circuit for a downstream O2 sensor when the check engine light is triggered by a bad catalytic converter (maybe $700 from Honda). This is why I ask these questions.

Thank you.