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Where is the 5th cylinder spark plug on a4.0 v6 motor?

There's no universally consistent cylinder numbering system for V6 engines. The location of the #5 spark plug depends entirely on the manufacturer's firing order and how they've numbered the cylinders.

To find the #5 spark plug, you must consult a repair manual specific to the *year, make, and model* of your 4.0L V6 engine. The manual will have a diagram showing the cylinder arrangement and firing order, allowing you to accurately locate cylinder #5 and its corresponding spark plug.