Most Chevy small block and big block V-8 engines use the firing order 1-8-4-3-6-5-7-2. The LS family of V-8 engines has a 1-8-7-2-6-5-4-3 firing order, according to Reference.com. Firing order designates the way spark plugs fire and internal combustion supplies power from the engine.Continue Reading
Correct placement of spark plug wires on the distributor results in the correct firing order with gasoline engines using mechanical points. In engines using direct ignition, the engine control unit, a vehicle's on-board computer, ensures the plugs fire in the correct order. Most manufacturers cast the firing order on the cylinder head, valve cover or intake manifold, especially on vehicles with distributors.
Attaching plug wires in the wrong firing order causes rough idle and backfiring. In some cases, the vehicle fails to start.
With GM V-8 engines, the number one cylinder is located at the front of the engine on the driver's side of the vehicle. GM does not use V-8s in front-wheel drive vehicles with transverse-mounted engines. On Chevy engines, the odd-numbered cylinders are on the driver's left and the even are on his right.
Ford numbers their engine cylinders with 1-4 on the driver's left and 5-8 on the right. While their firing pattern is 1-3-7-2-6-5-4-8, a careful comparison shows the corresponding pistons fire in the same order as the Chevy big- and small-block engines.Learn more about Car Makes & Models
The firing order of the Ford 302 is 1-5-4-2-6-3-7-8. The rotor direction under the distributor for this engine is counterclockwise. Ford numbers the cylinders sequentially from the front to back, with 1-4 on the driver's left and 5-8 on the right, according to BoxWrench.Full Answer >
The firing order of a Ford engine determines how the coil sends electrical power to the spark plugs to detonate the fuel in the cylinder. If a person attaches the plug wires in the wrong order, the engine runs poorly or does not run.Full Answer >
Many Ford enthusiast and car repair sites post detailed specifications for the engines used in the Ford F-150 series of pickup trucks that include the spark plug firing order of the cylinders. The precise firing order varies from engine to engine, however, so it is important to determine the engine used in a specific F-150 to determine which engine's information applies to that truck.Full Answer >
The firing order for a Ford 351 is 1-3-7-2-6-5-4-8, which differs from that of most other Ford V-8 engines. This same pattern is in the 351W, 351M and 351C, as well as the Ford 400 and later 5.0 engines.Full Answer >