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

Spark plugs serve to ignite the fuel-air mixture in a variety of heat engines, not only automotive, but also including the rocket engines. There are known four types of spark plugs: arc, spark, glow plugs and catalytic. As for the gasoline internal combustion engines, there are used spark plugs.

Combustible mixture lights with an electric discharge voltage of several thousands / tens of thousands of volts, which occur between the electrodes. This component is actuated in a particular engine operating cycle. The spark plug itself is not as complicated as you might imagine. It consists of an insulator, metal body and the central conductor. By mode of operation gasoline engines spark plugs are divided into medium, hot and cold. They differ in the degree of insulator and electrodes heat.

When the insulator and electrodes begin their work, the plugs must be heated to temperatures that promote surface self-cleaning from the combustion products of gasoline. We mean carbon black, soot deposit, etc. This fact determines the colour of the plugs’ insulators that are working optimally. As a rule they are tawny. Spark plugs got their size classification by type of thread.

No matter what kind of spark plugs you need to replace in your car, you can always rely on our online store. To date we can guarantee you competitive prices and fast delivery of any car parts that you can find in our catalogue. Whether it is a V-belt, joint disc or other car part, you'll find it in our Internet store at a great price.

Spark Plug for OPEL MERIVA, LEXUS RX (MHU3_, GSU3_, MCU3_), PEUGEOT 408

Spark plugs failure
  • wear on the surface;
  • cracks or contamination of the insulator;
  • soot on the spark plugs electrodes;
  • bridging the gap between the electrodes;
  • destruction of the part.
Symptoms of faulty spark plugs
  • increase of CO in the exhaust gas;
  • hindered engine start (starter operates but the engine will not start / starts after long starter operation);
  • reduced vehicle dynamics;
  • engine vibrates while driving, more distinctly at idle;
  • reduced power capacity;
  • increased fuel consumption.
Causes of spark plugs faults
  • the center electrode (core) is covered with deposit;
  • wear of piston rings;
  • pollution or damage to the cooling system water pump;
  • incorrectly selected spark plug operating temperature;
  • too long ignition;
  • engine overload;
  • poor performance of water cooling system.

Even an ordinary inspection of the spark plug will determine their condition and identify malfunctions of the engine. It is necessary to analyze the color of the insulator of the spark plug working tip. Normal state, indicating the optimal operation of the engine, is a light tan or grayish spark plug color. Whereas the dark color (black wet or dry deposits) indicates too cold heat range of the spark, excessively rich mixture, a possible reduction of vacuum, low compression, late ignition timing or the spark gap is too large.

Repair and replacement of spark plugs

The requirements of the majority of manufacturers state: spark plugs are subject only to replacement, but not to repair. Average service time is 15 thousand kilometers. You can replace the spark plugs on your own:

  • disconnect the high-voltage ignition wire;
  • now take the high-pressure compressor and clean any dust around the spark plugs with an airflow;
  • when installing a new spark plug pay special attention to the spark gap, referring to the official sources (manufacturer web site).

Spark Plug replacement - instructions, descriptions and repair

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