fire on all four cylinders

fire on all four cylinders

To function or operate at the most desirable or greatest possible level of efficiency, speed, or productivity. (Usually used in the continuous tense.) The phrase alludes to the cylinders in an engine. The new website will be firing on all four cylinders once we get the comments section up and running! I only fire on all four cylinders after I've had my coffee.
See also: all, cylinder, fire, four, on

firing/working on all ˈcylinders

(informal) using all your energy to do something; working as well as possible: The 24-year-old player feels that he is not yet firing on all cylinders.
See also: all, cylinder, firing, on, working