Does Not Stalling Mean No Water Intake?
3 Answers
When driving through flooded areas, not stalling indicates that the engine hasn't taken in water, but it's difficult to ensure whether other parts of the vehicle have been submerged or soaked. Here's some relevant information: Observe road conditions carefully: Before driving through water, pay attention to the depth, flow direction, and speed of the water, and assess whether there are obstacles like mud or quicksand underwater. Additionally, wrap the distributor and high-voltage wires with plastic sheeting before entering the water. Observe the path and speed of vehicles ahead to gauge the water depth and determine if your car can pass safely. Maintain steady power: On hard surfaces, engage a low gear and enter the water slowly. Keep the steering wheel steady and maintain a consistent throttle to ensure the car has sufficient and stable power to pass through in one go, avoiding stops, gear changes, or sharp turns if possible. Be especially cautious if the underwater surface is sandy or muddy.
As a veteran driver who frequently travels long distances, I've seen plenty of cars stranded in water. Not stalling does indicate a high probability that the engine block hasn't taken in water, since if water gets sucked into the cylinders, the engine would immediately shut down with a bang. But don't rush to ease off the throttle! If the water level rises above the exhaust pipe, the water pressure can block the exhaust, causing the RPM to drop sharply. The most critical thing is the second attempt to start—once the engine stalls, even if it's just for two seconds, don't turn the key again! I've personally witnessed several cases where the owner thought it was fine to restart, only to end up bending the connecting rods. Remember, if the water depth exceeds half the tire height, maintain steady throttle and drive through at a constant speed—letting off the gas is a death sentence. After getting out, immediately check the air filter box; if you spot mud marks, head straight for repairs. Delay, and you'll be looking at a full engine overhaul.
Running an auto repair shop for twenty years, I've often had people bring in cars that didn't stall after driving through water, asking if they needed repairs. The key lies in the position of the air intake. When the engine is running, the cylinders act like syringes drawing in air; water ingestion only occurs if the water level rises above the intake grille. If the water only reaches the middle of the tires, with most cars having air intakes about 70 cm off the ground, stalling is indeed unlikely. However, when the exhaust pipe is submerged, the backpressure increases, and you can hear the engine struggling with a 'puttering' sound. Continuing to press the accelerator in this situation can cause severe damage to the catalytic converter. More troublesome is the transmission vent, which on low-positioned models can let water in during submersion, leading to gearbox jerking months later. So even if the car drives out, it's advisable to lift the chassis and check if the wiring connectors got soaked.
