What Causes the Engine to Roar Without Power When Accelerating Hard?
2 Answers
When the car's accelerator is pressed hard but lacks power, it is due to abnormal engine performance. The following are specific reasons: 1. The car engine operates through the coordinated work of the intake system, ignition system, and fuel system. If any of these components has an issue, it can potentially reduce the engine's power, leading to unresponsiveness when pressing the accelerator, inability to increase engine speed, and lack of power during acceleration. 2. When the accelerator is pressed, the throttle cable moves the throttle valve, which has a position sensor. The control unit uses the signal from the throttle position sensor to determine the throttle opening, calculates the corresponding signal voltage, and then determines the fuel injection amount based on this voltage. If the throttle position sensor is dirty or the voltage is imbalanced, it can cause electronic throttle failure, resulting in a lack of power when accelerating hard. 3. Apart from electronic throttle issues, attention should also be paid to the engine's intake, fuel system, and ignition system. If there is a leak or blockage in the intake system, it can also lead to a lack of power when accelerating hard.
I've been driving for decades, and the issue of sluggish acceleration with the engine roaring when flooring the gas pedal is quite common. It's mostly caused by problems in the intake system. A dirty or clogged air filter restricts airflow, preventing the engine from getting enough air, which naturally leads to weak acceleration and that roaring sound. Fuel supply can also be a factor—it might be a weak fuel pump, clogged fuel injectors, or leaking fuel lines, resulting in insufficient fuel entering the cylinders and incomplete combustion. Issues in the ignition system, like worn-out spark plugs or faulty ignition coils, are also risky, causing unstable ignition and reduced power. A clogged exhaust system increases backpressure, putting extra load on the engine and making it roar. A slipping clutch or transmission failure can cause the engine to rev without propelling the car. Ignoring this problem poses serious driving risks, such as sudden stalling. It's best to get a comprehensive check at a professional repair shop as soon as possible. Regular maintenance, like replacing air filters and spark plugs, can help prevent these issues.
