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 LeBaron
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4 cylinder engines may develop a cold engine knock that may last for 3-5 minutes and is often...