What Causes an Automatic Transmission Vehicle to Stall in Water?
3 Answers
If an automatic transmission vehicle stalls in deep water, do not attempt to restart the engine, as this can cause engine damage. Turn off the vehicle's power, engage the parking brake, and exit the vehicle. Below is relevant information about automatic transmission vehicles: 1. Principle: An automatic transmission uses planetary gear mechanisms to shift gears. It automatically adjusts the gear ratio based on the throttle pedal position and vehicle speed, allowing the driver to control speed solely through the accelerator pedal. 2. Types: Generally, the common types of automatic transmissions in vehicles include: hydraulic automatic transmission, hydrostatic automatic transmission, electric automatic transmission, stepped mechanical automatic transmission, and continuously variable mechanical automatic transmission.
I've had several experiences with water fording and found that stalling in an automatic transmission is mostly caused by water entering the intake system. When driving through deep water, water can be sucked into the engine through the intake, and since water cannot be compressed or burned, the engine stops instantly. I'm usually a cautious driver, but that time the rain was too heavy, and I misjudged the water level. After the car stalled, I checked and found water in the cylinders, costing several thousand to repair. I recommend estimating the water depth before fording—don't exceed half the wheel height—and driving slowly to reduce splashing. Additionally, electrical circuits may short-circuit, and the automatic transmission's computer module is prone to failure when wet. Never restart the engine after stalling, or the damage could worsen. Regular maintenance of sealing components and testing before fording are key to avoiding the embarrassment of breaking down on the road.
Understanding vehicle principles reveals that water is usually the culprit behind stalling in flooded areas. When water is sucked into the intake, it replaces the air, causing the engine to stall due to insufficient air for combustion. In automatic transmissions, electrical systems may also short-circuit if water comes into contact with wiring or control units, leading to malfunctions. Personally, I recommend driving through flooded areas at a steady, slow speed to avoid splashing water onto components. If the engine stalls, do not attempt to restart it to prevent hydro-locking. Additionally, a wet air filter can block airflow, also causing the vehicle to stop. It's best to keep the wading depth within the designed limits, such as below the intake height, ensuring safety and saving on repair costs.
