Excessive Exhaust Emissions (Odors)

1. Vacuum leaks.
2. Improper ignition timing.
3. Faulty emissions cannister.
4. Faulty PCV valve.
5. Blocked [1][2]PCV vacuum hose.
6. Faulty spark plugs.
7. Faulty spark plug wires.
8. Improper fuel usage.
9. Fuel in crankcase.
10. Improper fuel pressure.
11. Improper EGR valve operation.