What Causes Excessive Engine Exhaust and How to Deal with It?
2 Answers
Engine exhaust issues and their solutions mainly include: 1. Poor injector performance. This is more noticeable at low speeds, with smoke increasing as the RPM decreases. In this case, the single-cylinder fuel cut-off method can be used to identify the problematic cylinder. Once identified, stopping the fuel supply will eliminate the black smoke. 2. Fuel supply angle is too small. This leads to increased fuel supply, resulting in incomplete combustion and black smoke. Adjusting the fuel supply advance angle to a larger setting can resolve this. However, if the fuel supply is too high, black smoke will persist continuously, worsening with higher throttle input. In such cases, reducing the angle will help.
I've been driving for 20 years, and there are several key reasons for increased engine exhaust. First, a clogged air filter with too much dust leads to insufficient air intake and incomplete combustion, resulting in excessive smoke. Second, issues with the fuel system, such as low fuel pump pressure or clogged fuel injectors, prevent proper fuel injection into the cylinders. Third, ignition system failures, like worn spark plugs or aging coils, cause incomplete combustion due to insufficient spark. Fourth, internal engine wear, such as leaking valves or improper air-fuel mixture ratios. Fifth, faulty sensors, like inaccurate oxygen sensors, cause ECU control issues. How to handle it? First, check the air filter yourself—replace it if dirty, as it's cheap and easy. If the problem persists, inspect the spark plugs and fuel system, and clean the fuel injectors. If that doesn't work, visit a repair shop to read fault codes and check for sensor or internal issues. Don't delay—excessive exhaust not only wastes fuel but also damages the engine and poses long-term safety risks. Remember, regular maintenance can prevent this; checking the filter every 10,000 km is very effective.
