be firing on all cylinders

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be firing on all cylinders

To be functioning or operating at the most desirable or greatest possible level of efficiency, speed, or productivity. The automated messaging process is firing on all cylinders now that we've solved the bouncing issue. I'll be firing on all cylinders after I've had my coffee.
See also: all, cylinder, firing, on

firing on all cylinders

 and hitting on all cylinders 
1. Lit.
[of an internal combustion engine] having all its cylinders working and thus providing the maximum amount of power. The old car is firing on all cylinders despite its age. This thing's not hitting on all cylinders.
2. Fig. working at full strength; making every possible effort. The team is firing on all cylinders under the new coach. The factory is hitting on all cylinders to finish the orders on time.
See also: all, cylinder, firing, on

be firing on all cylinders

COMMON If someone is firing on all cylinders, they are doing a task with great enthusiasm and energy. I saw her a few weeks ago and she was firing on all cylinders. When Wales are firing on all cylinders, they can beat any country in the world. Note: If someone is not doing a task as well as they should be, you can say that they are not firing on all cylinders or are only firing on two cylinders. We were only firing on two cylinders in the first half of the game. Note: This expression refers to the cylinders in an engine. There are usually four of them.
See also: all, cylinder, firing, on

firing on all (four) cylinders

working or functioning at a peak level.
This expression is a metaphor from an internal-combustion engine: a cylinder is said to be firing when the fuel inside it is ignited.
1998 Entertainment Weekly Even when his imagination isn't firing on all cylinders, Amis is still worth picking up, if only to enjoy the jazzy rhythm of his prose.
See also: all, cylinder, firing, on