What Causes Poor Acceleration and Loud Engine Noise?
2 Answers
It may be due to excessive carbon buildup inside the engine or prolonged failure to change the engine oil. Detailed explanations of the causes and solutions for loud engine noise are provided below: Detailed causes of loud engine noise: All engines have a compression ratio. If carbon deposits accumulate on the piston crown, it will increase the engine's compression ratio. An increased compression ratio can cause knocking during engine operation, leading to reduced power output and increased fuel consumption. Engine oil serves multiple functions including lubrication, cleaning, sealing, heat dissipation, cushioning, and rust prevention. Prolonged failure to change the oil can increase internal engine resistance and accelerate engine wear. Solutions for loud engine noise: Clean the throttle body. After prolonged vehicle use, the throttle body may accumulate dirt. If engine noise becomes excessively loud, it might be due to a dirty throttle body - professional cleaning at a repair shop can significantly improve the situation. Sound insulation improvement. The noise issue might also stem from deteriorated sound insulation performance. As various soundproofing materials age, previously inaudible sounds may penetrate the cabin. Therefore, upgrading sound insulation can effectively reduce noise levels.
Poor acceleration accompanied by loud engine noise may indicate issues with the engine itself or related components. I've seen many vehicles exhibit these symptoms, with the most common cause being engine misfire due to uneven cylinder operation—such as a worn spark plug or faulty ignition coil in one cylinder, leading to uneven combustion, insufficient power output, and increased noise. Another potential cause is inadequate fuel supply from the fuel system, like low fuel pump pressure or clogged fuel injectors, which prevents sufficient fuel delivery, forcing the engine to work harder and produce louder noise. A dirty air filter restricting airflow or an exhaust leak generating additional noise could also be culprits. Additionally, transmission issues like clutch slippage can cause poor acceleration, making the engine sound like it's roaring. I recommend starting with simple checks: inspect the air filter for replacement, try changing the spark plugs, or listen for abnormal exhaust sounds. If the problem persists, a full inspection at a repair shop is advisable to prevent long-term damage affecting engine lifespan. Timely action is crucial—don't delay until a highway breakdown occurs.
