What are the reasons for engine acceleration difficulties and abnormal noises?

[LaLorenzo]

Engine acceleration difficulties and abnormal noises are caused by: 1. Engine misfire or knocking; 2. Dirty or poor-quality engine oil; 3. Loose connecting rod bearings and crankshaft bearings, melted bearing shells, or improper dimensions during rotation. The function of an engine is: to convert the thermal energy of gasoline into mechanical energy by expanding gas through combustion in a sealed cylinder to push the piston and perform work, thereby providing power for the vehicle. Engines can be used as power generation devices or refer to the entire machine including the power unit (such as gasoline engines, aircraft engines). Their types include internal combustion engines (such as gasoline engines), external combustion engines (such as Stirling engines, steam engines), gas turbines (used in racing cars), electric motors, etc.

[SanEli]

I've experienced engine acceleration difficulties accompanied by abnormal noises several times. It feels like severe carbon buildup might be clogging the fuel injectors, or possibly the spark plugs are aging and not firing smoothly. Last time my car made a clicking sound, and upon inspection, it turned out to be a faulty ignition coil – replacing it fixed the issue. If the air filter is clogged and causing insufficient air intake, the engine can struggle to breathe, making it particularly hard when stepping on the gas. Also, insufficient or degraded engine oil can cause dry friction in piston movement, leading to strange noises. These problems shouldn't be ignored, especially if you hear sounds like metal knocking, which could indicate loose connecting rod bearings. Delaying repairs could lead to complete engine failure. Remember to find a reliable repair shop as soon as possible to read the fault codes with a diagnostic tool – don't push it until you break down on the road like I did last time.

[DaniellaAnn]

My old car has been whining when accelerating recently, and the throttle feels particularly sluggish. The mechanic said the catalytic converter is clogged, causing poor exhaust flow and reduced power. Additionally, if the fuel pump isn't supplying enough fuel, the engine won't get sufficient gasoline and will wheeze like an asthma patient during acceleration. A loose timing chain makes a clanking metal friction noise, while a slipping belt produces a squealing sound. I suggest checking the simplest parts first: use the dipstick to see if the oil level is adequate, and check if water has entered the fuel tank causing fuel stratification. If there's a puffing air leakage sound from the engine bay, it's likely a broken vacuum hose. These situations are quite dangerous - if problems are found, it's best to call a tow truck directly for repairs.

[McCarmen]

The engine lacks power during acceleration and makes abnormal noises, most likely due to ignition system issues. Severe carbon buildup on spark plugs causing cylinder misfire is a classic symptom, resulting in jerking sensations during acceleration. Clogged fuel injectors leading to poor fuel atomization can also produce popping sounds. If you hear a rattling noise right after startup, it might indicate timing chain wear. A leaking exhaust manifold emits a hissing sound along with particularly pungent exhaust fumes. A fuel filter that hasn't been replaced for too long may cause fuel delivery issues, preventing the engine from reaching higher RPMs during acceleration. For older vehicles, pay special attention to worn valve guides - the accompanying ticking noise and abnormally fast oil consumption mean immediate repair is needed.