What are the reasons for a 170 gasoline engine emitting black smoke and lacking power?
2 Answers
Possible causes include a dirty air filter in the vehicle, poor ignition state of the spark plugs, or malfunctioning ignition coils. Here is related information about gasoline engines emitting black smoke: Causes: Black smoke emission from a gasoline engine is a relatively common phenomenon, mainly due to an overly rich air-fuel mixture in the engine, resulting in incomplete combustion of fuel. This phenomenon is also a primary manifestation of engine faults, and there are many potential causes that need to be investigated one by one. When the air filter in the car is too dirty, the spark plugs have poor ignition performance, or the ignition coils malfunction, it can lead to black smoke emission from the engine exhaust. Solutions: Always refuel at designated gas stations, as using low-quality gasoline can easily lead to similar issues. The air filter should be replaced regularly, as prolonged use can cause the air-fuel mixture to become too rich; inspect the spark plugs.
I've been working on small engine repairs for many years. It's very common to see a 170 gasoline engine emitting black smoke and lacking power, usually caused by insufficient air supply or excessive fuel. A clogged air filter is the most common issue—dust buildup restricts airflow, making the air-fuel mixture too rich and causing incomplete combustion, which results in black smoke (unburned carbon particles). Problems with the fuel injection system are also not uncommon, such as injector leaks or excessive fuel pressure, leading to poor combustion efficiency and naturally reduced power. Spark plug carbon buildup or aging can also cause ignition failure, worsening the problem. Lack of power indicates a significant drop in engine output, making it struggle to perform. Regular maintenance is crucial—clean or replace the filter periodically and check the spark plugs every 5,000 kilometers. Ignoring repairs leads to higher fuel consumption, environmental pollution, and accelerated engine wear, making repairs more costly later.
