Firing Order & Cylinder Identification

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The 4.8L, 5.3L, 6.0L & 8.1L engines are equipped with a coil for each spark plug and is connected to spark plug with a short high tension wire.

See FIRING ORDER & CYLINDER IDENTIFICATION .

Fig 1: Firing Order (4.3L)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Firing Order (4.8L, 5.3L, 6.0L & 8.1L)

Courtesy of GENERAL MOTORS CORP.

Fig 3: Firing Order (6.6L)

Courtesy of GENERAL MOTORS CORP.