Carbon buildup on the top of the piston is common. Over time this can lead to symptoms varying from light ticking to knocking noises. Performing a fuel injector cleaning procedure can often help the condition by removing some of the piston top deposits.
Engine Knocking Noise From Carbon Buildup on Chrysler Town & Country
Average mileage: 134,032 (128,000–139,000)
5 people reported this problem
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Loud knocking from tio end of engine when under load.