Quote:
Originally Posted by Grape Ape
There are at least 4, as the ECM carefully deactivates each one (during either the power or compression stroke, I forget which).
I would like it if switching the transmission to manual mode would disable the AFM. But that is enough switch for me since I'm pretty sure that the ECM will be able to moderate the AFM for better mileage than the driver could.
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The valves are closed after the powerstroke, to trap the exhaust gasses.