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Ignition / Preheating auto parts: Spark Plug

Spark plug is necessary to ignite air fuel mixture in the internal-combustion engine. In the ignition coil a voltage appears that comes from spark plugs to the engine compartment. Between two electrodes ignition spark appears and creates a small flash in the engine compartment. It starts the cylinders. Spark plugs are made of steel and have a screw thread. Due to it they are attached in the engine basic block. Under optimal conditions spark plugs clear themselves. If they overheat (because of temperature difference, for instance), this may result in ignition failure.

Motor mechanic can see the correct engine adjustment relying on spar plugs condition after long period of their use. When inspecting the plugs, the specialist can see if the oil level in the mixture is low or high. An important moment is the distance between electrodes. In the engine must be plugs with a correct heat rating. If you are not sure about these two points, pay attention to the maintenance instruction. There will be not a problem to replace the plugs as for definite car models there are definite spark plugs.

Any car owner can replace the spark plugs. First remove the spark plug pin. Then unscrew the spark using the spark plug socket and insert a new spark plug. After this replace the pins. When installing the spark plug, be careful not to deform the outer electrode. In our online store you can buy ignition cable, ignition module and ignition coils. Moreover, here you will find original spare car parts, such as brake shoe facings, horns, mudguards, window lifters, clutch discs, tie rods and shock absorbers.

Spark plugs failure

  • working surface is worn-out;
  • insulator is cracked or soiled;
  • there is a soot deposit on the component;
  • distance between electrodes doesn't meet the standard;
  • part is spoiled.

Signs of spark plugs failure

  • exhaust with high CO content;
  • the engine starts with difficulties but the starter works properly;
  • vehicle dynamic performance decrease;
  • considerable vibration of the engine when driving (mainly idling);
  • drop of traction and power;
  • fuel consumption increase.

Causes of spark plugs failure

  • deposit on the core;
  • piston rings are worn-out;
  • pump of the cooling system is choked up or destroyed;
  • spark plug temperature is determined incorrectly;
  • continuous ignition;
  • the engine is overloaded;
  • malfunctions in system of water cooling.

Diagnostics

It is often sufficient to inspect the part visually to estimate spark plugs condition and find out the cause of failures.  For this purpose it is sufficient to check the colour of an insulator of a spark plug working tip. Gray or yellow-brown colour is indicative of correct operation of the component. Dry or damp black deposits point to:

  • excessively cold temperature range of the spark plug;
  • the extremely saturated mixture;
  • drop of vacuum;
  • late ignition point;
  • low compression;
  • the increased spark plug gap.

Repair and replacement of spark plugs

The spare part service life usually doesn't exceed 15 000 operational kilometers. Replacement of spark plugs should be performed in the following order:

  1. Disconnect high-voltage wires of ignition.
  2. Clean spark plugs off soiling with the help of air flow which is supplied by the compressor.
  3. Install new sparks with obligatory control of interelectrode distance (amount of gap is specified on the  site of manufacturer).
Top quality parts Spark Plug for your car
Spark Plug replacement | NGK 97506 Parts Details
  • Spanner Size: 14 mm
  • Outer thread [mm]: 12,0
  • Thread Length [mm]: 26,5
  • Spark Position [mm]: 6,0
  • Spark Plug: Fixed SAE connector, Iridium Middle Electrode, 1 - Earthed Electrode, interference Suppression 5 kOhm, with gasket seat
  • Version: Bi-Hex
  • Condition: New
In stock
Details
-31%
Buy NGK Engine spark plug 97506 for car at low price £ 10,32
Spark Plug (NGK, 97506)
Article №: 97506
£ 10,32
£ 14,96**
incl. 20% VAT, excl. delivery costs
Spark Plug replacement | NGK 94124 Parts Details
  • Spanner Size: 14 mm
  • Outer thread [mm]: 12,0
  • Thread Length [mm]: 26,5
  • Spark Position [mm]: 3,0
  • Spark Plug: Iridium Middle Electrode, 1 - Earthed Electrode, interference Suppression 5 kOhm, with gasket seat
  • Condition: New
In stock
Details
-31%
Buy NGK Spark plug set 94124 for car at low price £ 17,75
Spark Plug (NGK, 94124)
Article №: 94124
£ 17,75
£ 25,72**
incl. 20% VAT, excl. delivery costs
Spark Plug replacement | BERU Z332 Parts Details
  • Product line: ULTRA
  • Spanner Size: 14 mm Bi-Hex
  • Thread Length [mm]: 26,5
  • Spark Plug: 1 - Earthed Electrode, with gasket seat
  • Thread Size: M12x1,25
  • Electrode Gap [mm]: 0,7
  • Connector type: SAE
  • Technical Information Number: 12 ZR-6 SPP2-1
  • Tightening torque from [Nm]: 15
  • Tightening torque to [Nm]: 25
  • Condition: New
In stock
Details
-31%
Buy BERU Spark Plug Z332 for car at low price £ 8,94
Spark Plug (BERU, Z332)
Article №: Z332
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£ 12,96**
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Spark Plug replacement | DENSO SK20R11 Parts Details
  • Product line: Iridium
  • Spanner Size: 16
  • Thread Length [mm]: 19
  • Spark Plug: 1 - Earthed Electrode
  • Tightening Torque [Nm]: 22
  • Diameter [mm]: 14
  • Weight [g]: 43
  • Condition: New
In stock
Details
-31%
Buy DENSO Engine spark plug SK20R11 for car at low price £ 9,47
Spark Plug (DENSO, SK20R11)
Article №: SK20R11
£ 9,47
£ 13,72**
incl. 20% VAT, excl. delivery costs
Spark Plug replacement | NGK 4339 Parts Details
  • Spanner Size: 16 mm
  • Outer thread [mm]: 12,0
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 3,0
  • Spark Plug: Unscrewable SAE connector, Nickel Middle Electrode, 1 - Earthed Electrode, interference Suppression 5 kOhm, with gasket seat
  • Condition: New
In stock
Details
-31%
Buy NGK Spark plug set 4339 for car at low price £ 5,85
Spark Plug (NGK, 4339)
Article №: 4339
£ 5,85
£ 8,48**
incl. 20% VAT, excl. delivery costs
Spark Plug replacement | DENSO IK16TT Parts Details
  • Product line: Iridium TT
  • Spanner Size: 16
  • Thread Length [mm]: 19
  • Spark Plug: 1 - Earthed Electrode
  • Tightening Torque [Nm]: 22
  • Diameter [mm]: 14
  • Weight [g]: 43
  • Condition: New
In stock
Details
-31%
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Spark Plug (DENSO, IK16TT)
Article №: IK16TT
£ 10,16
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Spark Plug replacement | NGK 2397 Parts Details
  • Spanner Size: 16 mm
  • Outer thread [mm]: 14,0
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 5,2
  • Spark Plug: Fixed SAE connector, Nickel Middle Electrode, 3 - Earthed Electrode, interference Suppression 1kOhm, with gasket seat
  • Condition: New
In stock
Details
-31%
Buy NGK Engine spark plug 2397 for car at low price £ 5,33
Spark Plug (NGK, 2397)
Article №: 2397
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£ 7,72**
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Spark Plug replacement | DENSO K16TT Parts Details
  • Product line: Nickel TT
  • Spanner Size: 16
  • Thread Length [mm]: 19
  • Spark Plug: 1 - Earthed Electrode
  • Tightening Torque [Nm]: 22
  • Diameter [mm]: 14
  • Weight [g]: 43
  • Condition: New
In stock
Details
-31%
Buy DENSO Spark plug set K16TT for car at low price £ 2,93
Spark Plug (DENSO, K16TT)
Article №: K16TT
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Spark Plug replacement | DENSO T20TT Parts Details
  • Product line: Nickel TT
  • Spanner Size: 16
  • Thread Length [mm]: 17,5
  • Spark Plug: 1 - Earthed Electrode
  • Tightening Torque [Nm]: 22
  • Diameter [mm]: 14
  • Weight [g]: 40
  • Condition: New
In stock
Details
-31%
Buy DENSO Spark Plug T20TT for car at low price £ 3,42
Spark Plug (DENSO, T20TT)
Article №: T20TT
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Spark Plug replacement | NGK 1422 Parts Details
  • Spanner Size: 16 mm
  • Outer thread [mm]: 12,0
  • Thread Length [mm]: 26,5
  • Spark Position [mm]: 3,5
  • Spark Plug: Fixed SAE connector, Iridium Middle Electrode, 1 - Earthed Electrode, interference Suppression 5 kOhm, with gasket seat
  • Condition: New
In stock
Details
-31%
Buy NGK Engine spark plug 1422 for car at low price £ 14,82
Spark Plug (NGK, 1422)
Article №: 1422
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Spark Plug replacement | DENSO ZXU20PR11 Parts Details
  • Product line: Iridium
  • Spanner Size: 16
  • Thread Length [mm]: 19
  • Spark Plug: 1 - Earthed Electrode
  • Tightening Torque [Nm]: 17
  • Diameter [mm]: 12
  • Weight [g]: 41
  • Condition: New
In stock
Details
-31%
Buy DENSO Spark plug set ZXU20PR11 for car at low price £ 9,83
Spark Plug (DENSO, ZXU20PR11)
Article №: ZXU20PR11
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Spark Plug replacement | CHAMPION CET16P Parts Details
  • Product line: Aerovantage Spoiler
  • Spanner Size: 14 mm Bi-Hex
  • Thread Length [mm]: 26,5
  • Spark Position [mm]: 3
  • Spark Plug: 1 - Earthed Electrode, with gasket seat, Platinum Middle Electrode
  • Thread Size: M12x1.25
  • Electrode Gap [mm]: 0,75
  • Connector type: SAE
  • Packing Type: Box
  • Quality/ Grade: Ti Poly-V
  • Technical Information Number: CET16P
  • Tightening torque from [Nm]: 15
  • Tightening torque to [Nm]: 25
  • Packaging length [cm]: 8,85
  • Packaging width [cm]: 2,6
  • Packaging height [cm]: 2,35
  • Resistance from [kOhm]: 3
  • Resistance to [kOhm]: 7,5
  • Projection [mm]: 1,5
  • Condition: New
In stock
Details
-31%
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Spark Plug (CHAMPION, CET16P)
Article №: CET16P
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