What’s happening: Your engine’s spark plugs deliver the electric spark that ignites the cylinder’s fuel/air mixture. What Could Cause Engine Knocking? Faulty Spark Plugs The result? An annoying noise and potential damage to your engine's cylinder walls and pistons. Engine knocking happens when fuel burns unevenly and those shocks go off at the wrong time. (Think sparklers, not fireworks.) After each pocket burns, it creates a little shock, igniting the next pocket and continuing the cycle. When cylinders have the correct balance of air and fuel, fuel will burn in small, regulated pockets instead of all at once. Knocking occurs when fuel burns unevenly in your engine's cylinders. Read on to learn what causes engine knocking and why it's truly no joking matter. If the sound is closer to a "knock," you may be dealing with problems under the hood-problems that could cause engine damage if left unresolved. It could be a squeal, a clunk, or even a rumble and roar. If there’s something everyone can agree on, it’s that cars can make weird noises.
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