- Water ingress: If water enters the engine, ignition system, or other critical components, it can lead to misfires, rough running, and stalling. This is especially true for older vehicles with less effective sealing around these areas.
- Electrical issues: Washing a car can sometimes disrupt electrical connections, especially if water gets into electrical components or wiring. Moisture can cause short circuits, leading to a variety of problems, including engine performance issues.
- Clogged air filter: The air filter is responsible for preventing dirt and debris from entering the engine. If the air filter gets wet during washing, it can become clogged and restrict airflow, resulting in reduced engine performance, such as sluggish acceleration and reduced power.
- Contamination of fuel system: In rare cases, water can enter the fuel system during washing, particularly if water is sprayed directly into the fuel filler neck. Water in the fuel tank can cause rust and corrosion and, more immediately, cause the engine to run roughly or even stall.
Before washing your car, ensure to avoid spraying water directly into sensitive areas like the engine compartment, electrical components, and the fuel filler neck. Consider using a garden hose with a gentle spray setting instead of a pressure washer and keep the water pressure reasonably low. After washing, let the car dry thoroughly, and take additional measures like using compressed air to help clear water from hard-to-reach areas or using a microfiber cloth to dry sensitive components and areas with electrical connections. If problems persist despite these precautions, it's best to have the car inspected by a mechanic to identify and address the specific cause accurately.
