Black smoke and a drop in mileage in a vehicle can indicate a potential issue with the fuel system or engine performance. Here are a few possible causes and solutions for black smoke and reduced mileage in a Thunderbird 350 (2017 model, BS4) within 10500 km:
Fuel Quality: Poor-quality fuel can lead to incomplete combustion, resulting in black smoke and decreased mileage. Ensure that you are using good quality fuel from reputable fuel stations.
Air Filter: A clogged or dirty air filter can restrict airflow to the engine, leading to an improper air-fuel mixture and inefficient combustion. Check and clean or replace the air filter as necessary.
Fuel Injector Issues: Dirty or malfunctioning fuel injectors can spray an incorrect amount of fuel into the engine, causing black smoke and reduced mileage. Consider cleaning or replacing the fuel injectors if necessary.
Spark Plugs: Worn or faulty spark plugs can affect combustion efficiency, leading to incomplete burning of fuel and increased emissions. Inspect and replace the spark plugs if needed.
Engine Tuning: Incorrect engine tuning, such as an improperly adjusted carburetor or fuel injection system, can cause black smoke and reduced mileage. Have the engine tuning checked and adjusted by a qualified mechanic.
Exhaust System: A malfunctioning or blocked exhaust system can disrupt the flow of exhaust gases, leading to black smoke. Inspect the exhaust system for any issues and repair or replace components as necessary.
Regular Servicing: Ensure that your Thunderbird 350 receives regular maintenance and servicing as per the manufacturer's recommendations. This includes oil changes, filter replacements, and overall inspection of the vehicle.
If the problem persists even after checking these potential causes, it is advisable to consult with a professional mechanic or authorized service center. They can diagnose the issue more accurately by performing a detailed inspection and recommend the appropriate solution for your specific Thunderbird 350 model.