The Firing Order in Vehicles

by Contributing Writer; Updated June 12, 2017

The firing order on these engines is the order in which the cylinders are supposed to receive spark. When you perform a tune-up or any other repair that involves removing any spark delivery component, you must set the firing order according to Vehicles specification. This is why, when changing plugs or plug wires, you should change one Vehicles a time, to maintain the correct firing order.

Under The Hood:

 The Firing Order in a 1997 Ford F350

Gasoline Engines

The cylinder banks are the same even though the firing order is different between the two gasoline engines. From front to back, the passenger-side bank is numbered 1, 2, 3, 4 and the driver-side bank is numbered 5, 6, 7, 8. The firing order on the 5.8-liter engine is 1-3-7-2-6-5-4-8. The firing order on the 7.5-liter engine is 1-5-4-2-6-3-7-8. If you're not sure which engine is in your F-350, look at the vehicle identification number. The eighth position in the VIN identifies the engine. If the character is an "H," you have the 5.8-liter engine. If it's an "F," you have the 7.5-liter.

Diesel Engine

You know what kind of fuel you put in your F-350, so if you have the diesel engine, there is no need to decode the VIN. From front to back, the passenger-side bank is numbered 1, 3, 5, 7 and the driver-side bank is numbered 2, 4, 6, 8. The firing order on your 7.3-liter Powerstroke is 1-2-7-3-4-5-6-8.

 What Is the Firing Order on a 1998 Ford F150?

Firing Order on the 4.2-Liter V-6

Starting on the passenger side front of the 4.2-liter engine and moving clockwise, the cylinder numbers are 1-2-3-6-5-4. The firing order of the 4.2-liter engine is 1-4-2-5-3-6.

Firing Order on the 4.6-Liter V-8

The cylinder numbers on the 4.6-liter engine are 1-2-3-4-8-7-6-5, starting from the front, passenger side of the engine and moving clockwise. The 4.6-liter's firing order is 1-3-7-2-6-5-4-8.

Firing Order on the 5.4-Liter V-8

The 5.4-liter's cylinders are numbered 1-2-3-4-8-7-6-5, starting on front, passenger's side of the engine and moving clockwise around the engine. The 5.4-liter has a firing order of 1-3-7-2-6-5-4-8.

Importance of Firing Order

If the firing order is incorrect, it causes the sparks to go to the wrong cylinders. This means the engine will run rough, stall or backfire, if it runs at all.

 Firing Order for a 2000 Chevy Silverado 5.3L

Vortec 5300 Specs

The Vortec 5300 has a distributorless ignition system -- a separate ignition coil supplies spark to each cylinder. The powertrain control module controls ignition timing. In your Silverado, the Vortec 5300 produces 285 horsepower at 5,200 rpm and 325 foot-pounds of torque at 4,000 rpm.