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 Dodge Shadow
Average mileage: 107,000 (107,000–107,000)
Engine affected: 2.2L 4 Cylinder
6 people reported this problem
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