Why does the engine not rev up and feel weak when accelerating?
2 Answers
Accelerating without the engine revving up and feeling weak is most commonly caused by a clogged fuel filter or fuel injector, which leads to the fuel pump not working properly and insufficient fuel pressure. In this case, the fuel filter or fuel injector needs to be replaced. The throttle, also known as the "air valve" or "throttle valve," is the control device that regulates the engine's power (thrust). In piston aircraft engines, the throttle controls the opening of the carburetor's throttle valve to regulate the cylinder's filling volume, thereby determining the engine's output power. Additional information: The following are reasons for abnormal throttle noise: 1. Carbon buildup in the throttle causing sticking: The throttle should be cleaned. 2. Wear of the throttle pedal pivot pin: Adding grease can solve the problem; if not, replacement is necessary. 3. Poor installation of the throttle cable: For electronic throttles, check the throttle pedal mechanism and throttle pedal sensor.
I've encountered a similar issue before where the car felt sluggish when stepping on the gas, and the RPM just wouldn't go up—it felt like something was holding it back. Usually, this is related to fuel supply problems, possibly due to an aging fuel pump or a clogged filter, which naturally results in no power if fuel isn't being delivered properly. It could also be an issue with the ignition system, like spark plugs fouled with too much carbon buildup failing to ignite, or a faulty ignition coil. Additionally, if there's a leak in the intake system or a problem with the mass airflow sensor, the engine might not get enough air, leading to poor RPM performance. I'd recommend first checking the quality of the gasoline you've recently used—low-quality fuel can easily clog the fuel injectors. Also, as cars age, sensors like the throttle position sensor might fail, sending incorrect signals that prevent the ECU from properly controlling the throttle. In any case, don't keep driving like this—it's unsafe. Take it to a shop to read the trouble codes with a diagnostic tool. Simple issues like changing the air filter you might handle yourself, but for more complex problems, it's best to consult a professional, especially since it affects driving safety. Losing power on highways can be particularly dangerous.
