- Worn piston rings: Worn or broken piston rings can allow oil to leak into the combustion chamber, resulting in oil burning and smoke from the exhaust.
- Damaged valve stem seals: Faulty valve stem seals can cause oil to seep into the combustion chamber when the valves are closed.
- Cracked or damaged cylinder head: A cracked or damaged cylinder head can allow oil to leak into the combustion chamber.
- Excessive engine wear: General engine wear and tear, such as worn-out bearings or piston rings, can cause increased oil consumption and oil burning.
- Faulty PCV (positive crankcase ventilation) valve: A malfunctioning PCV valve can cause pressure buildup in the crankcase, forcing oil into the combustion chamber.
- Turbocharger or supercharger issues: If your Accord is turbocharged or supercharged, problems with the turbo/supercharger seals can result in oil leaking into the exhaust system.
Diagnosis and Repair:
To diagnose the exact cause of the oil burning and exhaust smoke, a qualified mechanic would typically perform the following:
1. Inspect the engine: A visual inspection of the engine bay can reveal oil leaks or external damage.
2. Compression and leak-down tests: These tests can help identify worn or damaged piston rings, valves, or cylinder head.
3. Oil pressure test: Checking oil pressure can indicate wear in engine components or a faulty oil pump.
4. Smoke test: A smoke test can help detect leaks in the intake or exhaust systems, including problems with the turbocharger or supercharger (if applicable).
Once the cause of the oil burning is determined, the necessary repairs can be done, such as replacing worn piston rings, valve stem seals, or fixing a damaged cylinder head. It's important to address this issue promptly to prevent further damage to the engine.
