What Causes Black Smoke from China IV Diesel Engines?

1 Answers
DelJulianna
07/29/25 11:46pm
The reasons for black smoke from China IV diesel engines are: 1. Excessively rich air-fuel mixture; 2. Excessive engine oil in the fuel; 3. Poor sealing of piston rings or crankshaft oil seals; 4. Water content in the fuel; 5. Faulty spark plugs; 6. Overly dirty air filter. China IV refers to the National Phase IV Emission Standard. Methods to check a vehicle's emission standard include: 1. Check the motor vehicle conformity certificate: The certificate accompanying the vehicle upon delivery clearly states the emission standard; 2. Refer to the vehicle's packing list: Locate the emission standard in the vehicle information section; 3. Examine the Certificate of Conformity: It contains exhaust emission data and indicates the corresponding emission standard; 4. Query on the Motor Vehicle Environmental Protection Website: Find the public query platform on the homepage, enter the vehicle's VIN code and the last 6 digits of the engine number to retrieve the information; 5. Inspect the vehicle's environmental protection label: The back of the environmental protection label on the front windshield clearly displays the vehicle's emission standard.
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