- Cause: Burning Oil. Worn piston rings, valve guides, or seals can allow oil to enter the combustion chamber where it burns along with fuel.
- Diagnosis: Oil smell, low oil level, worn spark plugs, drop in performance.
2. Black Smoke:
- Cause: Incomplete fuel combustion.
- Engine over-fueling, faulty fuel system, air leaks, clogged air filter, or problems with sensors or fuel injectors.
- Diagnosis: Difficulty in starting, reduced power, rough idling, excessive fuel consumption.
3. White Smoke:
- Cause: Coolant leaking into combustion chamber.
- Blown head gasket, damaged cylinder head or engine block, or cracked cooling system components.
- Diagnosis: Coolant loss, sweet odor, engine overheating.
4. Continuous White/Blue Smoke:
- Cause: Bad Turbo.
- Excessive oil leaking from the turbocharger can burn, creating persistent smoke.
- Diagnosis: Whistling or whining sounds, drop in performance.
5. Gray or Brown Smoke:
- Cause: Worn engine components.
- Worn piston rings or cylinder walls can cause oil-burning smoke.
- Diagnosis: Worn engine sounds, loss of power.
