What Causes Blue Smoke During Cold Start?
1 Answers
The reasons for blue smoke during cold start are detailed as follows: 1. Causes of blue smoke during cold start: aging, damage, or failure of valve stem seals; excessive clearance between valves and guides. 2. Air filter issues or clogged intake system: leading to poor air-fuel mixture (overly rich), causing excessive oil to enter the combustion chamber and burn. 3. Long-term incorrect driving habits or prolonged overloading: resulting in premature engine aging and wear. 4. Use of substandard engine oil or failure to change oil regularly: the root cause being overly thin oil that fails to combust completely.