You will need
  • - the instruction manual for your car or vehicle passport (PTS)
  • - protective gloves
  • - candle key
Determine the type of its engine.
Just look at your title or the manual of your car, if you cannot answer this question. If you have a diesel, then you need candle bulbs glow or spark ignition. For the petrol engine, you need spark the spark plugs.
Unscrew one of your old candles. If access to the spark plugs is not limited, it is quite easy to do with a special candle key. Lift the hood of your car, locate the candles, remove one wire to the pin and carefully remove it.
Go to the store. There you can either pick up the candle according to your make and model of the car or show the old candle, with which consultants and will select a new set.
For passenger cars usually fit the spark plugs with thread type "A". Length of candle, the size of her head and the heat rating is determined by the vehicle manufacturer, and the number of electrodes and the material from which they are made, you can choose from.
Select the material of the electrodes.
A standard candle is supplied with one copper electrode. In addition to copper, the electrodes of the spark plugs is made with addition of iridium, yttrium and platinum. Are candles with such electrodes is several times more expensive than their copper companions, but refractory metals give a much greater resource, that is, the candles last longer and burn slower. You also get more stable and powerful electrical charge, which is important for engine operation: the course will be smooth,with no failures in the ignition.
If funds allow, you make a choice in favor of platinum spark: fuel consumption with exhaust emissions will be reduced by a few percent, and replacement candles will not need for many years. If no extra money - the copper candle is also nice, although there are several less reliable and durable.
Determine the desired number of electrodes.
Standard candles are produced with one side electrode, is improved with several. Manufacturers claim that multi-electrode spark plugs contribute to the operation of the engine without failure and make the system of ignition more reliable. The advice here can only be the same as when choosing the material of the electrodes: use common sense.