Excessive Exhaust Emissions (Odors)

1. Vacuum leaks.
2. Improper ignition timing.
3. Faulty emissions cannister.
4. Faulty PCV valve.
5. Blocked 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.