The maintenance - Ford Focus
 Introduction
 2. Engines
 3. System of greasing of the engine
 4. Cooling system
 5. The power supply system
 6. Management of the power unit and the fulfilled gases
- 7. Ignition system
    7.1. The general data
   7.2. The ignition coil
   - 7.3. Spark plugs
      7.3.1. Kalilnoe number
      7.3.2. The backlash between electrodes increases in operation
      7.3.3. Definition of work of the engine on appearance of a candle
    7.4. Work with ignition system
 8. Coupling
 9. A transmission
 10. A drive of forward wheels
 11. A forward suspension bracket
 12. A back suspension bracket
 13. A steering
 14. Brake system
 15. An electric equipment
 16. System of release of the fulfilled gases
 17. Wheels and tyres
 The appendix
 Schemes of electric connections

Ford Fokus>> Ignition system>> Spark plugs>> Definition of work of the engine on appearance of a candle
On appearance of the candle removed from the working engine it is possible to define, the engine well or badly works:
- Cone of an insulator from light grey to grey colour — well prepared working mix;
- The cone of an insulator of white colour — too poor working mix, probably, the wrong moment of ignition, is faulty the management block. Check up concentration СО2;
- Touch of black colour in the form of a soot — wrong калильное the number, too rich working mix. Check up concentration СО2;
- Oil traces on electrodes — are damaged piston rings, plugs of valves, маслосъемные caps. Fuel and oil mixing is possible. Replace candles, oil and fuel mark. Again check up external a kind of candles.