What Causes Weak Acceleration and Engine Buzzing in a Car?

[ODylan]

Low fuel pressure; clogged or poorly atomizing fuel injectors. Below is relevant information about engines: 1. Introduction: An engine is a machine capable of converting non-mechanical energy into mechanical energy. 2. Classification: Includes internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc. 3. External Combustion Engine: An external combustion engine means the fuel burns outside the engine. 4. Internal Combustion Engine: The internal combustion engine, or reciprocating piston engine, differs most from external combustion engines in that the fuel burns inside it. There are many types of internal combustion engines, with common gasoline and diesel engines being typical examples.

[GenesisRose]

I've been driving for over ten years and have encountered situations where the car lacks acceleration power and the engine makes a buzzing noise several times, usually due to issues with the powertrain. The most common cause is inadequate fuel supply, such as a clogged fuel filter or dirty fuel injectors, preventing the engine from getting enough fuel. It could also be an ignition system failure, like worn-out spark plugs failing to ignite. I remember one time when my car was buzzing and lacked power; after inspection, it turned out the air intake was blocked by leaves stuck in it, and it ran smoothly after cleaning. Other possible reasons include sensor failures (such as a faulty oxygen sensor), deteriorated transmission fluid, or a loose timing chain. When facing this issue, I recommend checking the air filter and fuel pump first, as these are relatively simple fixes. For prevention, regular maintenance and using quality gasoline can help avoid costly major repairs.

[StEleanor]

My car had the same issue before - lack of power during acceleration with engine humming noise. It's probably caused by excessive carbon buildup affecting combustion. Modern electronic fuel injection systems are quite sensitive to carbon deposits, especially noticeable during idling or low-speed driving. Additionally, exhaust system blockage (like a failed catalytic converter) can prevent proper exhaust flow, making the engine work harder. If the humming comes with vibrations, it might indicate loose or worn engine mounts. Also need to check if ignition coils or high-voltage wires have short circuits. For solutions, try highway driving to clean carbon deposits or use fuel additives. If that doesn't work, scan for trouble codes - problems like crankshaft position sensor issues can show similar symptoms. Don't delay too long, otherwise fuel consumption will skyrocket and cause further damage.

[SanCollin]

When my old car struggles to accelerate and the engine makes a buzzing noise, I suspect it's either the clutch or transmission acting up. For manual transmissions, worn clutch discs can cause slipping, while for automatics, dirty transmission fluid may lead to rough shifting. The buzzing sound sometimes comes from loose belts or timing components, which can be quite annoying. I recommend first checking the transmission fluid level and condition—replace it if it's too murky. Another possible culprit is a vacuum leak, which affects the air-fuel mixture. I've dealt with this issue myself: found a small crack in a vacuum hose, replaced it with an inexpensive one, and that fixed it. For prevention, regular transmission fluid and belt changes can save a lot of hassle.

[StRafael]

Lack of acceleration accompanied by a buzzing sound often leads to soaring fuel consumption. I believe the main causes are a faulty mass air flow (MAF) sensor or a dirty throttle body, as insufficient air intake makes the engine struggle. Additionally, low fuel pump pressure or a clogged fuel filter can also cause this. Once, my car had this issue, and the mechanic found the fuel pressure was too low during testing; replacing the pump fixed it. Long-term neglect may lead to engine overheating or even stalling, posing safety risks. It's advisable to promptly inspect sensors and actuators, including the MAF and throttle position sensor (TPS). Also, check for any exhaust manifold leaks. For daily prevention, regularly replace the air filter and use high-quality gasoline—it's both eco-friendly and cost-effective.