Quote:
Originally Posted by Jinn
What, exactly, is powering the cylinders, then? If you were using no gas, the engine would immediately die. You are using less, simply as a result of a lower revolution speed of the crankshaft; but no less than idle.
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The wheels are turning the driveshaft, which is turning the transmission, which is turning the crankshaft, which is moving the pistons. Engine braking works because the pistons are compressing air during the compression stroke and not being powered on the way back down. This is true of all EFI engines, but not carbureted or MFI. Once you get down to just above idle speed, the injectors turn back on. Above that engine speed (usually 1200-1500RPM,) no fuel is being used.