Knock-knock jokes can sometimes be funny, but when your engine’s the one doing the knocking, it’s nothing to laugh at.  Engine knocking can be caused by many different things.  Late model cars are equipped with a knock sensor which “hears” the sound and makes corrective adjustments, but this sensor can’t compensate for a severe malfunction which could damage the engine. If you’ve noticed a knocking noise when you accelerate or climb a hill, ask us to check for the cause.