What are the symptoms of a bent connecting rod in a car?

1 Answers
SanLydia
07/30/25 12:04am
Symptoms of a bent connecting rod in a car include unstable idling accompanied by shaking and vibration after the engine starts, as well as piston misalignment. Here are the reasons for a bent connecting rod in a car: Water entering the engine cylinder: Water entering the engine cylinder (combustion chamber) can cause the connecting rod to bend or break. When a vehicle is driven on roads with accumulated water, the engine may suck water into the cylinder. The water initially entering the cylinder quickly forms a water-gas mixture under the high temperature of the cylinder block, making it impossible to form a combustible mixture in that cylinder. As more water enters, it accumulates on top of the piston, reducing the effective volume of the combustion chamber, increasing compression resistance, and raising the pressure transmitted from the piston to the connecting rod, ultimately leading to a bent connecting rod. Abnormal engine fuel injection system: An abnormal engine fuel injection system can cause the connecting rod to bend or break. When a cylinder's injector continuously sprays fuel, symptoms such as difficulty starting, unstable idling, black smoke from the exhaust pipe, and reduced power often occur. Abnormal fuel injection can also result in a bent connecting rod.
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