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.
Average mileage: 169,029 (100,089–295,000)
Engines affected: 4.7L V8, 5.2L V8, 5.9L V8
13 people reported this problem
2 answersSeptember 13, 2011
4 answersApril 24, 2012
1 answerApril 06, 2013
1 answerJune 08, 2014
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