One the 3.9L V6 and 5.9L V8 the carbon buildup on the top of the piston is common. As the buildup increases with mileage and over time, symptoms may vary from light ticking, to ticking/hammering, to hammering/knocking noises. Fuel injector cleaner often solves the problem.
Carbon buildup at top of piston may cause noise on Dodge Ram 1500
Average mileage: 169,029 (100,089–295,000)
Engines affected: 4.7L V8, 5.2L V8, 5.9L V8
13 people reported this problem
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ticking and hammering noises