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Engine Knocking Noise From Carbon Buildup on Mitsubishi Eclipse GSX

Problem Description and Possible Solution

Carbon buildup on the top of the pistons is common. As the buildup increases with over time, symptoms vary from light ticking, to hammering, to knocking noises. Performing a fuel injector cleaning procedure can often help the condition by removing some of the piston top deposits.

Problem Data
RepairPal Verified
Average mileage: (–)
5 model years affected: 1990, 1991, 1992, 1993, more1994
5 people reported this problem