[marvinstockman]

I have the plain jane Muzzler which just uses a resistor. I have never changed from the default resistor that was shipped with it, who's value I think is 82 ohms. I'd go back to the default resistor, and not worry about whether the ECO light activates or not. As long as the light doesn't stay on, it isn't an issue.

My temp gauge stays around the middle of the gauge, and not much different than before the Muzzler.

If your engine is running hot, you probably have another issue.

Finally, I think having the ECM activate is not a bad thing, as it 'exercises' the ECM hardware but doesn't harm or foul the engine.

 

[marvinstockman]

Sorry, I meant 'VCM activate' and not ECM.

 

[marvinstockman]

As I said, go back to the 82 ohm resistor, and your coolant temp reading will be only slightly off.

 

[marvinstockman]

And as I said, don't worry about the ECO light activating for a short amount of time.

 

[marvinstockman]

It works by reporting to the ECM a lower temperature than actual, and VCM won't activate below that certain temperature. When idling in hot weather, the coolant temp heats up enough to allow the VCM to activate.