What Causes Blue Smoke During Cold Engine Start?
1 Answers
Causes and solutions for blue smoke during cold engine start are as follows: 1. The vehicle uses unqualified engine oil, or the oil has not been changed for a long time, resulting in overly thin oil that burns incompletely and causes blue smoke. Solution: Regularly replace with qualified high-quality engine oil. 2. Poor quality of the air-fuel mixture participating in combustion, or failure to replace aged/damaged filters. Solution: Replace aged or damaged filters. 3. Severe wear of valve guides and valves creates excessive clearance, allowing excessive oil from the rocker arm chamber to be drawn into the combustion chamber during intake, leading to blue smoke. Solution: Perform regular maintenance at professional auto repair shops. 4. Piston rings get stuck in grooves due to carbon deposits, losing elasticity and normal function. Solution: Replace piston rings if necessary, or remove them to clean carbon deposits. 5. Excessive oil in the oil pan causes oil to splash into the combustion chamber during high-speed crankshaft rotation. Solution: Check oil level with dipstick and drain excess oil. 6. Severe wear between cylinder liners and piston components creates excessive clearance, allowing large amounts of oil to enter the combustion chamber during engine operation, resulting in incomplete combustion and blue smoke. Solution: Replace damaged piston components.
