Chevy 2.8 Duramax Firing Order Diagram

Reading the 2.8L Duramax LWN Inline-Four diagram correctly

Cylinders are numbered 1-2-3-4 from the front/timing-drive end toward the transmission in the longitudinal Colorado/Canyon installation. Read the vehicle as installed and use the manufacturer's left/right convention, not the side from which you happen to be standing. The first cylinder listed in 1-3-4-2 begins the sequence but does not define a universal connector position.

GM Powered Solutions data explicitly lists the LWN firing order as 1-3-4-2 and identifies it as a longitudinal 2.8L inline-four. It is unrelated to the 6.6L Duramax V8, so neither its bank diagram nor its eight-cylinder order applies. Common-rail injector connector number, injector compensation data and firing-event position are different references. Depressurize and service the fuel system only by the exact GM procedure; the diagram is for cylinder identity, not permission to loosen a high-pressure line. On coil-on-plug engines, use the diagram for cylinder identity and diagnosis; the PCM, not a physical distributor cap, schedules spark.

Which 2.8L Duramax LWN Inline-Four firing order applies?

GM Powered Solutions data explicitly lists the LWN firing order as 1-3-4-2 and identifies it as a longitudinal 2.8L inline-four. It is unrelated to the 6.6L Duramax V8, so neither its bank diagram nor its eight-cylinder order applies. This distinction matters because the engine can look nearly identical from above. Treat the camshaft or engine assembly as the authority when parts have been mixed. A firing order cast into an intake, copied from a generic decal, or remembered from another V8 is not enough to identify a modified engine.

The application table separates the order, cylinder banks, and ignition-system notes. Read all columns before routing. The first number in 1-3-4-2 is cylinder 1, but the physical No. 1 terminal can appear in different clock positions when a distributor has been installed on a different gear tooth.

Bank numbering and verification on the 2.8L Duramax LWN Inline-Four

Common-rail injector connector number, injector compensation data and firing-event position are different references. Depressurize and service the fuel system only by the exact GM procedure; the diagram is for cylinder identity, not permission to loosen a high-pressure line.

GM Powered Solutions data explicitly lists the LWN firing order as 1-3-4-2 and identifies it as a longitudinal 2.8L inline-four. It is unrelated to the 6.6L Duramax V8, so neither its bank diagram nor its eight-cylinder order applies.

Procedures used with this specification

These steps are the same for every vehicle in this family, so they are documented once rather than repeated on each page. The values above remain specific to this Chevrolet 2.8L Duramax LWN Inline-Four.