Identify the AMC 258 Engine
The AMC 258 is a 4.2-liter inline-6 engine commonly used in Jeep vehicles. Confirm this by checking the engine identification tag or stamp, often located on the block near the intake manifold.
Refer to Official Documentation
Consult the owner's or service manual for precise firing order details. Standard factory specification is 1-5-3-6-2-4, which aligns with inline-6 engines.
Physically Verify if Unavailable
If manuals are missing, inspect the distributor cap rotation:
- Rotate the engine to top dead center on cylinder 1 using a socket on the crank pulley.
- Note the distributor rotor position: it points to terminal 1.
- Trace the spark plug wires clockwise for sequence 1-5-3-6-2-4.
Cross-check with cylinder numbering: Cylinder 1 is frontmost, with others sequentially rearward.
Key Considerations
Always double-check to prevent misfires or damage. The standard 1-5-3-6-2-4 order remains consistent for AMC 258 variants.