What Causes Car Shaking After Driving Through Water?
2 Answers
Engine shaking after a vehicle drives through water occurs because a small amount of water enters the high-voltage wires when the car is submerged. Additionally, water enters the engine air filter element, increasing intake resistance and allowing water to enter the combustion chamber. This leads to poor ignition system performance, and in severe cases, the spark plugs may fail to ignite, causing the car to stall. More relevant information is as follows: Precaution 1: When driving through water, downshift to 1st or 2nd gear in advance and maintain high throttle to power through. If the water submerges the exhaust pipe, causing a significant drop in power and making acceleration ineffective, keep the throttle high and avoid shifting gears midway. After crossing the water, stop the car in neutral. Rev the engine a few times to expel water from the exhaust pipe. Before driving again, press the brakes several times to ensure they function properly. Precaution 2: If encountering an obstacle while driving through a waterlogged area, the driver can shift to neutral and press the accelerator to maintain engine RPM, avoiding throttle reduction to prevent water from entering the exhaust pipe and causing stalling. If the engine stalls during the process, do not attempt to restart it or tow the car in gear—only tow it in neutral to a repair shop.
After driving for so many years, I've encountered situations where the car suddenly shakes after wading through water, which is usually caused by water entering the engine system. The most common reason is the dampness of ignition components, such as spark plugs and high-voltage wires getting wet, leading to a failure in spark generation. This causes one of the cylinders to stop working, making the engine shake like a sieve. It could also be due to the air filter sucking in too much water, resulting in insufficient air intake and incomplete combustion. The uneven pressure caused by water mixing in can also lead to vibrations. I remember one time after wading through water, the car shook violently. I stopped and opened the hood to find that water had submerged some of the wiring. Fortunately, I dried it in time, avoiding major issues. Shaking after wading is the engine's protest; continuing to drive could damage the cylinders or connecting rods, or even burn out the electronic control module, leading to costly repairs. It's advisable to slow down and pull over immediately, letting the engine rest instead of rushing to drive. If possible, check for water marks and then send it for repair.
