Lincoln LS 3.9L V8: There Is No "5th Cylinder"

The Lincoln LS 3.9L V8 has eight cylinders—not five. Cylinders are numbered 1–8 in the firing order (typically 1-5-4-2-6-3-7-8 for this engine), but there is no distinct "5th cylinder" position; cylinder #5 is simply one of the eight.

If you're diagnosing a misfire code (e.g., P0305 = cylinder 5 misfire), locate cylinder #5 using the firing order diagram for the 3.9L Jaguar-derived AJ-V8. On this engine, cylinders are arranged:

• Bank 1 (passenger side): 1-2-3-4 (front to rear)
• Bank 2 (driver side): 5-6-7-8 (front to rear)

So cylinder #5 is the front cylinder on the driver's side. Access requires removing the intake manifold or coil pack. Always consult the factory service manual for precise procedures.