{"id":94993,"date":"2023-10-20T07:32:05","date_gmt":"2023-10-20T14:32:05","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=94993"},"modified":"2025-05-09T08:54:15","modified_gmt":"2025-05-09T15:54:15","slug":"what-exactly-is-engine-firing-order","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/what-exactly-is-engine-firing-order\/","title":{"rendered":"What Exactly Is Engine Firing Order?"},"content":{"rendered":"\nReading Time: <\/span> 4<\/span> minutes<\/span><\/span>\n\n\n

Engines are the heart of every vehicle, and different engine types operate in different ways. One of the things that differentiates engines from each other is firing order. If the engine is the heart, the firing order is its heartbeat. But what is firing order exactly, and can you tune it how you like?<\/p>\n\n\n\n

What Is Firing Order?<\/h2>\n\n\n\n
In a gasoline engine<\/a>, the firing order or ignition sequence indicates the order and timing of when its spark plugs fire. In a diesel engine, firing order indicates the sequence of fuel injection.<\/p>\n\n\n\n
The crankshaft<\/a> and camshaft<\/a> design determine the firing order. The cylinders are arranged so their power strokes fire in the proper succession. The firing order also differs depending on the number of cylinders and the configuration of the engine. Firing order is usually written as a sequence of numbers or a combination of numbers and letters to identify the exact cylinders being triggered.<\/p>\n\n\n\n
Just because two engines have the same number of cylinders doesn’t mean they’ll follow the same firing order. For example, the Chevrolet 4.8 firing order is different from the Chrysler V8 firing order despite both engines having eight cylinders.<\/p>\n\n\n\n
Firing order is important because of valve timing. The spark plugs need to fire in sequence with the operation of the valves and pistons.<\/p>\n\n\n