carbon buildup

Engine Knocking Noise: What It Means and How to Fix It

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Engine Knocking Noise: What It Means and How to Fix It

Engine knocking noiseis a metallic pinging or rattling sound caused by abnormal combustion (detonation) or worn mechanical parts. Common fixes: use higher-octane fuel, clean carbon buildup, replace spark plugs, or repair bottom-end bearings. DIY cost: $20–$400. Shop cost: $200–$3,500.   Tuesday, 7:15 a.m., 38 °F in the shop—my coffee hadn’t even cooled when a 2014 … Read more