What causes a car to suddenly lose power while driving on the highway?
2 Answers
The reasons why a car suddenly loses power while driving on the highway include clogged fuel system, ignition system failure, dirty throttle position sensor, etc. Solutions for clogged fuel system: 1. Directly add fuel cleaner to the fuel tank. This is the simplest method, but the effect is not long-lasting, and the cleaning is not thorough. It is suitable for vehicles with low mileage. 2. Use the "drip bottle" method for cleaning. This can clean carbon deposits and deposits in both the fuel system and the throttle valve, and is generally the method recommended by auto repair shops. 3. Use a no-disassembly cleaning machine for cleaning. Connect the engine's fuel inlet and return pipes to the cleaning machine's corresponding pipes using special adapters to form a loop. This method is convenient and quick, but it only cleans the fuel injectors and does not clean carbon deposits on the throttle valve. However, in terms of cleaning the fuel system alone, the effect is very noticeable and is a good method for fuel system cleaning. 4. Replace the fuel filter every two maintenance intervals. Solutions for ignition system failure: 1. Connect the ignition tester and adjust the ignition timing to the specified value. 2. For ignition system failure, first start the engine and check if the warning light is on. If it is, use a fault code reader to retrieve the fault code. 3. Diagnose the low-voltage circuit fault based on the fault code content. If the warning light is normal, check the high-voltage circuit of the ignition system.
Having driven for over a decade and repaired many cars, I believe sudden loss of power during highway driving is often caused by fuel system failures. For instance, the fuel pump may overheat and burn out, especially during prolonged high-speed driving when engine load is heavy and fuel pressure demand is high—the pump simply can't handle it and gives out. Another common issue is a clogged fuel filter preventing fuel flow, much like a blocked nose making it hard to breathe. The throttle valve sticking is also frequent, preventing the throttle signal from reaching the engine control module. ECU malfunctions can similarly affect acceleration. These problems are particularly dangerous on highways as they may lead to loss of control, which is why I always advise regular maintenance: routinely check the fuel pump and filter, don’t cut corners. If an issue arises, pull over immediately—safety first. Early detection and action can prevent major trouble; prevention is key.
