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Replace a Spare part Ignition Coil – a defective one or if the limit of use has been already reached. Find out useful information about Ignition Coil

Ignition coil is a part of the engine. Its main function is to convert low voltage into high voltage. In fact the ignition coil is a transformer with a high rate of transformation. When the transformation ratio increases, the tension in the secondary winding rises. At the same time, there is an increase of ratio, which leads to overall dimensions increase. In addition, the secondary winding of the coil should have characteristics that provide the necessary current, peak voltage and duration of the spark discharge.

There are three types of ignition coils - for one spark, where the system is without distributor, single-spark type ignition coil and ignition coil for two sparks. The main requirement for this car part is the possibility to send a quick charging voltage on spark plugs, which is important at high speeds of mechanisms such as the crankshaft.

Ignition coils, which were used in cars of the last generation, with oil or bitumen insulation in a metal case, now are replaced by other types of coils - with gum fillers on the basis of epoxy resin. One of major advantages is a good resistance to vibration. In addition, this kind of ignition coils has a small mass.

Whatever type of car part you need, we have a wide choice of goods. We speak about online shops, but not about dealer shops or service centres. In addition to a wide assortment you will get an excellent price and fast delivery. And this does not depend on what specific car parts you need - bearing clutch, ignition system, or flange.


Faulty ignition coil
  • mechanical damage of the ignition coil;
  • wear and tear of the part;
  • overheating of the ignition coil;
  • wear of the ignition coil terminal;
  • rupture of the coil winding.
Symptoms of the ignition coil failure
  • dips in the engine cycle;
  • decrease in maximum power of the vehicle;
  • the engine failures occur more frequently with a high humidity level in the atmosphere;
  • increase in fuel consumption;
  • indicator reading «Check Engine» on the dashboard.
Causes of a faulty ignition coil
  • use of low-quality spark plugs;
  • engine overheating;
  • exposure to high temperatures, dust and dirt;
  • damage to the coil insulation at a voltage higher than 35 000 V;
  • vibration of coils and looseness of fastenings;
  • overload of electrical circuit.

Identifying the faulty ignition coil without special equipment is impossible. Independently you can estimate the appearance of the coil: if the housing has traces of oxidation, small holes or black spots, the coil is out of order.

If there is a slightest sign of failure, check the item at a service station. Use an ohmmeter or multimeter to measure the resistance of the primary and secondary coil windings. The primary winding resistance should be in the range of 0.5-2 ohm. Value of secondary winding resistance should be in the range of 6000-15 000 ohms. To accurately determine the fault it is necessary to find out the exact values ​​of the norms in the vehicle technical documentation.

The service life of the ignition coil is 60 000-80 000 kilometers. Diagnostics of the system is recommended after 30,000 kilometers or every six months.

Repair and replacement of ignition coils

The ignition coil cannot be repaired. Ingress of oxygen into the body always impairs the system, so even small deviations in the part’s performance require only to replace it.

One of the main factors of the part normal operation is correct wiring. Replacing the coil does not take much time, but if you do not have the necessary knowledge, you should refer to a service shop.

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