What Causes Incomplete Engine Combustion?
2 Answers
Engine incomplete combustion is caused by damaged spark plugs, poor fuel quality, and excessive carbon deposits. Damaged Spark Plugs: The most common issue is damaged spark plugs. Worn spark plug electrode gaps result in insufficient ignition, leading to unburned air-fuel mixture and engine vibration during acceleration. Poor Fuel Quality: Low-quality gasoline leads to poor fuel injector atomization, causing incomplete combustion in the cylinder. It's recommended to switch to higher-octane gasoline after using up the current tank and perform a fuel system cleaning. Excessive Carbon Deposits: A dirty throttle body or carbon-clogged fuel injectors can cause throttle valve leakage or idle speed control motor jamming, resulting in high idle speed. Carbon buildup during engine operation also contributes to incomplete combustion.
A few days ago, I noticed my car was slow to accelerate and had terrible fuel consumption. After a check-up, it turned out the engine wasn't burning fuel efficiently. The main reasons could be clogged fuel injectors causing uneven fuel spray; or old spark plugs leading to delayed ignition with a weak flame that can't ignite the fuel properly. A dirty air filter can also restrict airflow, causing insufficient oxygen for complete combustion. Additionally, low cylinder pressure due to poor valve sealing results in inadequate compression. Using low-quality gasoline can leave residue buildup. These issues accumulate over time, making the car feel sluggish, and eventually causing black smoke from the exhaust and increased carbon deposits. Regular cleaning or part replacement is necessary. I do a full maintenance check every six months to prevent these problems.
