How to Replace Spark Plugs in Peugeot 308, 408 and 3008

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It is recommended to replace spark plugs in Peugeot every 40 000 km of the car run, for the 120 hp engine – NGK PLZKAR6A-11, for the 150 hp engine – NGK PLZKBR7A-G. But if you disregard the recommendation on replacing them, sooner or later you can face the fact that the engine does not work properly. This can be connected with the engine’s structure or its bad start, especially in the colder season.

How to Replace Plugs with Your Own Hands

You need only a torx T30 to unscrew an upper lid of the valve cover. On the first models, 8-point screws are installed. This regards to non-turbocharged versions of the EP6 engine.
Turbocharged engines do not have a lid.

Remove it and disconnect 4 sparking coils and take them out.

To remove platinum spark plugs, you need:

  • a wrench,
  • an extension cord,
  • a dioctahedral 14-point head.

Defective plugs can be easily detected: electric breakdowns from sparkling coils around the insulator and burnt electrodes of the non-contact group reflect failures. Low-quality fuel also reduces their service life.

The picture shows plugs at the run of 50 000 km without any replacement, electrodes and insulators are in a terrible condition. With these plugs with abrasion, the car misfires.

It is recommended to check plugs during each maintenance service of the Peugeot vehicle, especially in the countries where fuel does not always comply with high quality standards.

Video: How to Replace Plugs

Spark plugs are chosen individually for each car, as vehicles’ engines differ with their structures. So, there are just no universal plugs. They can be divided into hot and cold by their look. As for both parts’ purposes, the term “heat rating” should be noted. This term is used to define a time period, during which the plug reaches a maximum heat value. Plugs are divided depending exactly on this value. So, if the heat rating is high enough, the plug is called cold and, conversely, the hot plug is characterized by the low value.

When choosing a type of spark plugs, it is enough to focus on the intensity of the car’s load. If the load is too high, you should use cold plugs, as the temperature rises, which can cause an overheat in case of using hot plugs. As engines are characterized by a temperature range suitable for their correct smooth operation, there are plugs with different heat values or heat rating.

This value measures medium temperatures on the insulator and electrodes. On the insulator’s parts, the temperature must enter the certain range. The lowest limit of the range is 400 degrees due to the fact that oil deposit and soot does not accumulate on plugs at this temperature. By exceeding the limit of the range reaching 50 degrees you can face the heat rating that can cause some overheat and plug’s failure. To avoid such troubles, it is necessary to use fuel suitable for the engine and check the plug’s condition thoroughly and regularly.

Thanks to the technological progress, an extended range of heat ratings has started to be used in spark plugs. The most famous manufacturer of them is NGK, as it reflects double values.

The size of the engine also influences the choice of plugs. Depending on its size, plugs differ from each other with their look. The temperature range of the spark plug is also influenced by a material, of which the part is made and by a length of the heat cone.

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