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I don't mean to knock a product but I believe it is a really bad idea. But I see 2 major issues besides causing a check engine light due to misfires...
When you deactivate a cylinder by preventing the injector firing all of the air from that cylinder gets dumped into the exhaust. During normal closed loop operation the O2 sensor will sense a rise in O2 which tells the computer the mixture is too lean. The computer then tries to correct by adding fuel... Not only does it add fuel... it adds it to the whole bank. If the device disables cylinders in both banks you will have an engine constantly running rich. Bummer...
Okay lets say you can trick the O2 sensor somehow... You have other losses too with an engine not designed for cylinder deactivation...not only are the other cylinders fighting the friction of the dead cylinder but they have to work to push that cylinder through the compression stroke. You may say "Ah but after it reaches TDC the pressure pushes the piston back down". You would be correct but nothing is perfect there will be small pressure losses so the volume of air at TDC will not be the same as BDC.... double bummer...
Even before I came to EM.com I have played with the idea of disabling a cylinder at idle. As soon as that cylinder is disabled, the moment the O2 sensor reacts the PW and DC of the injector bank goes up. Even poking the button briefly at 800 RPM you can see the ECU compensate right away. That is an antiquated ECU dinosaur from 1995 I can only imagine what a newer ECU would do.
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