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 Mitsubishi Eclipse
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engines knocks when cold started, then slighty disapates when warmed up, but doesnt go away?
my car has 150,000+ miles on it. I have performed all maintenance required for that high mileage. upon start (but not EVERY time) the car makes a very loud knocking noise that continues sometime...
car was driving fine went to shift into 2nd when i heard something metal hit the ground lots of...