|
White
|
Coolant and/or water leaking into combustion chamber
|
- Bad head gasket (leaking)
- Cracked block or cylinder head
|
|
Blue
|
Engine oil being burned
|
- Oil leaking into combustion chamber
- Worn piston rings, valves or cylinders
- Bad exhaust manifold
- Bad head gasket
|
|
Black or Gray
|
Incomplete fuel combustion
|
- Clogged air filter
- Carburetor, choke, fuel injection, or emission system malfunction
- Ignition timing off
- Blocked manifold
- Low compression due to engine wear
|
|
White
|
Improper air/fuel mixture. Fuel is not burning
|
- Faulty fuel injection system
- Incorrect fuel injection and valve timing
- Engine overheating
- Faulty fuel pump and/or injection pump
|
|
Blue
|
Engine oil being burned or atomized
|
- Engine oil level too high
- Worn piston rings, valves, or cylinders
|
|
Black or Gray
|
Incomplete fuel combustion
|
- Damaged air filter
- Faulty fuel injection system
- Clogged air filter
- Wrong grade of fuel
- Incorrect fuel injection pump timing
- Engine overheating
- Low compression ratio
|
