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.