How to Deal with Heavy Engine Exhaust?

[ParkerMarie]

Methods to address heavy engine exhaust: 1. If black smoke is observed, it indicates incomplete combustion of the air-fuel mixture. Check if the high-voltage ignition wires have excessive resistance and inspect the spark intensity, which should normally appear white or white-blue. Also, examine whether the fuel injectors are dripping. 2. If blue smoke is emitted from the exhaust pipe, it signifies oil burning. In this case, the cylinder cut-off test can be used for diagnosis. Typically, this issue arises from excessive clearance between the piston rings and cylinder or aging/damaged valve stem seals. 3. The fuel cut-off method can be employed by disconnecting each fuel injector connector one by one, then observing and smelling the exhaust pipe to see if the odor or black smoke disappears. If changes occur, it indicates a fault in that particular cylinder. Additionally, check if the air filter is excessively dirty or clogged. 4. Heavy exhaust can also result from individual cylinders not firing in the ignition system, causing unburned air-fuel mixture to be directly expelled. The gasoline vapor then recondenses into white smoke, leading to heavy exhaust emissions.