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Spark plug - the right spark is what counts


Spark plugs are used in gasoline engines and play a central role as the main source of motive power. Each cylinder has at least one spark plug. In rare cases, two spark plugs are also required per cylinder. In the lower part of the page, we go into more detail about the function of the spark plug and show how you can recognize a defective spark plug. In addition, we give a few tips on what to look out for when buying spark plugs and changing spark plugs.

How does a spark plug work?
How to recognize a defective spark plug?
What to consider when buying spark plugs?
What to consider when changing spark plugs?

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4x BOSCH FR6LDC 0242240566 Zündkerze CITROEN Evasion Xantia XM FIAT Bravo I Marea 2.0

auch für LANCIA KAPPA LYBRA Y

Item No.: PKT562W011
Manufacturer: BOSCH
part number: 0 242 240 566
???item.ean.code???: 3165141085075
Delivery:

  • 4x Spark Plug Piece - BOSCH 0 242 240 566
13,55 EUR

incl. VAT, excl. shipping costs

Currently not available at the time

4x BOSCH WR4CC 0242250503 Zündkerze ALFA ROMEO Alfasud 901 1.2 LANCIA Y10 156 1.0 Turbo

Item No.: PKT972W759
Manufacturer: BOSCH
part number: 0 242 250 503
???item.ean.code???: 3165141051360
Delivery:

  • 4x Spark Plug Piece - BOSCH 0 242 250 503
10,65 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart

6x BOSCH WR4CC 0242250503 Zündkerze PORSCHE 911 3.2 SC Carrera bis 07.1989

PORSCHE: 999 170 157 90 | auch für JAGUAR XJ (XJ140, XJ181) 6 2.9 147/159/167 PS

Item No.: PKT972W760
Manufacturer: BOSCH
part number: 0 242 250 503
???item.ean.code???: 3165141051360
Delivery:

  • 6x Spark Plug Piece - BOSCH 0 242 250 503
13,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart

BOSCH 0242240587 FGR6KQE Zündkerze PORSCHE 996 Boxster 986 987 Cayenne 9PA 99917020791

auch für AUDI S6 (C5) + S8 (4D)

Item No.: A09514W501
Manufacturer: BOSCH
part number: 0 242 240 587
???item.ean.code???: 3165141650488
Anzugsdrehmoment_nm: 28
Funkenlage_mm: 4
Elektrodenabstand_mm: 1,0
Gewindelaenge_mm: 19
Ausstattungsvariante: FGR 6 KQE
Mengeneinheit: Stück
Schluesselweite: 16
Anziehwinkel_grad: 90
Pol_Anzahl: 4
Baugruppe: Zündanlage
Gewindesteigung_mm: 1,25
Aussengewinde_mm: 14
7,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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NGK Racing Zündkerze 4656 R7438-9 für AUDI TT RS RS3 2.5 TFSI

Item No.: UNI564W011
Manufacturer: NGK
part number: 4656
???item.ean.code???: 087295146569
Baugruppe: Zündanlage
Mengeneinheit: Stück
41,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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BOSCH 0242229699 Zündkerze FQR8LEU2 für ALFA ROMEO FIAT OPEL SAAB SUZUKI

Item No.: A16514W502
Manufacturer: BOSCH
part number: 0 242 229 699
???item.ean.code???: 3165143408780
Anzugsdrehmoment_nm: 28
Funkenlage_mm: 5
Gewindelaenge_mm: 19
Mengeneinheit: Stück
Schluesselweite: 16
Pol_Anzahl: 1
Anziehwinkel_grad: 90
Ausstattungsvariante: FQR 8 LEU 2
Baugruppe: Zündanlage
Elektrodenabstand_mm: 0,9
Gewindesteigung_mm: 1,25
Aussengewinde_mm: 14
8,50 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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4x NGK 96209 SIZFR6B8EG Zündkerze VW Golf 5 6 Passat B6 B7 1.4 TSI 03C905601B

auch für A1 ALHAMBRA IBIZA FABIA EOS SHARAN TIGUAN TOURAN

Item No.: PKT062W784
Manufacturer: NGK
part number: 96209
???item.ean.code???: 87295962091
Delivery:

  • 4x Spark Plug Piece - NGK 96209
43,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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NGK Zündkerze V-Line 44 97237 ZFR6T-11G für VW Caddy Fox Golf Jetta Polo

auch Altea Cordoba Ibiza Leon Fabia Rapid Roomster

Item No.: UNI514W559
Manufacturer: NGK
part number: 97237
Ausstattungsvariante: ZFR6T-11G V-Line 44
Aussengewinde_mm: 14,0
Zuendkerze: mit Flachdichtsitz
Baugruppe: Zündanlage
Gewindelaenge_mm: 19,0
Schluesselweite: 16 mm
Mengeneinheit: Stück
Funkenlage_mm: 7,0
10,05 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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4x NGK 93231 PZKER7A8EGS Zündkerze VW Golf 7 Passat B8 Polo 6R 6C 1.2/1.4 TSI

auch für A1 A3 Q3 IBIZA LEON FABIA OCTAVIA RAPID SUPERB TIGUAN TOURAN

Item No.: PKT862W167
Manufacturer: NGK
part number: 93231
???item.ean.code???: 87295932315
Delivery:

  • 4x Spark Plug Piece - NGK 93231
42,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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4x BOSCH FR78X Zündkerzen SUPER 4 für AUDI BMW SKODA SEAT VW OPEL MERCEDES FORD

und weitere Modelle | Einschränkung beachten!

Item No.: UNI514W018
Manufacturer: BOSCH
part number: 0 242 232 802
???item.ean.code???: 3165141077186
Anzugsdrehmoment_nm: 28
Funkenlage_mm: 4
Elektrodenabstand_mm: 1,0
Gewindelaenge_mm: 19
Ausstattungsvariante: FR 78 X
Schluesselweite: 16
Anziehwinkel_grad: 90
Mengeneinheit: Satz
Pol_Anzahl: 4
Baugruppe: Zündanlage
Gewindesteigung_mm: 1,25
Aussengewinde_mm: 14
16,45 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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4x BOSCH FR7KPP332 0242235776 Zündkerze BMW 1er E81-88 3er E46 E90-93 5er E60 X1 X3 Z4

Item No.: PKT662W135
Manufacturer: BOSCH
part number: 0 242 235 776
???item.ean.code???: 3165143602317
Delivery:

  • 4x Spark Plug Piece - BOSCH 0 242 235 776
23,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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4x NGK 1675 PFR7S8EG Zündkerze VW Golf 5 6 Passat AUDI A3 8P A4 B7 B8 1.8/2.0 TSI/GTI

entspricht VAG OE-Nummer: 06H 905 601 A

Item No.: PKT062W707
Manufacturer: NGK
part number: 1675
???item.ean.code???: 87295116753
Delivery:

  • 4x Spark Plug Piece - NGK 1675
39,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart
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Function of a spark plug

The gasoline engine contains a mixture of air and fuel that can be ignited. The ignition voltage generated by the ignition coil is transmitted to the spark plugs, whereupon an ignition spark is created between the two electrodes of a spark plug. This results in a small explosion in the engine compartment, which causes the pistons to move. Subsequently, the engine begins to run. In total, a spark plug fires approximately between 500 and 3,500 times in one minute. For such a small spare part, that's a lot of stress.

In order for the engine to function correctly, properly functioning spark plugs are indispensable. Therefore, you should never underestimate them and replace them regularly within the replacement intervals prescribed by the vehicle manufacturer. The information regarding the replacement intervals can be found in the vehicle manual of your vehicle. Should malfunction symptoms already occur before, you must change the spark plugs earlier. Only spark plugs with platinum center electrode or iridium electrodes as among others in some NGK spark plugs and Bosch spark plugs have a longer life.

How can you tell when a spark plug is defective?

With spark plugs it is a wearing part, because they wear out over time. This happens because as the spark is transmitted, microscopic particles also become detached, increasing the distance between the ground electrode and the center electrode over time. After many thousands of kilometers, the spark can then no longer jump. Indicators for a defect of one or more spark plugs can be, among others, the following:

  • Increase of Co² in the exhaust gas
  • Sluggish engine start (starter works, but engine does not start / starts after long starter operation)
  • Engine jerks / vibrates while driving and more noticeable at idle
  • Deterioration of engine performance
  • Increased fuel consumption
  • Sensing ignitions even during operation

The higher the quality of a spark plug, such as Bosch spark plugs or NGK spark plugs, the longer it takes for them to wear out. In addition to normal wear, a faulty setting in the engine can also cause a spark plug to wear out more quickly. For this purpose, a visual inspection of the spark plugs at regular intervals is sufficient. Your so-called plug image provides information about whether and what defect is present:

  • Head of spark plug is fawn: all is well
  • Center electrode is completely or partially burned off: inferior fuel, wrong or decomposing additives in fuel and or oil, defective valves
  • Spark plug mechanically broken: spark plug too long or due to deposits of metal chips
  • Upper part is sooted or electrodes fused together: spark plug is too cold in operation and does not burn all of it, fuel mixture too rich, mainly used only for short trips, dirty air filter, lead deposits may occur if fuel is too high in lead
  • Upper part is encrusted: Deposits of oil residue due to incorrect engine oil or engine settings
  • Spark plug oily: leaking piston rings or spark plug, oil level too high and therefore too much engine oil in combustion chamber
  • Spark plug white or melted: plug has become too hot, for example, due to a fuel mixture that is too lean

For all the above points, the spark plug change only treats the symptoms, but not the causes. The exact cause should finally be determined and remedied by trained professionals, so that the next spark plug change again only in the regular change interval needs to take place.

What to consider when buying spark plugs?

Whoever wants to buy a spark plug should always make sure that it has the right length and thread size. Likewise, the electrode gap and the heat value are important. It is best to first select the vehicle or search by the part number of the previous spark plug. With the results then still pay attention to the restrictions and already the correct spark plug is found.

In general, the search results show spark plugs from several brand manufacturers. For us, it is the following manufacturers:

All spark plugs offered by us are in OEM quality and are partly installed directly by the vehicle manufacturers ex works. In addition to the Bosch spark plugs and NGK spark plugs also convince the others with a high load capacity and a long service life. Therefore, it is worthwhile to rely on brand quality when buying spark plugs.

What to consider when changing spark plugs?

The spark plug change should always be carried out exclusively when the engine is cold. Before it comes to the exchange of the spark plugs, the high-voltage line of the ignition should necessarily be disconnected or switched off. In older cars, the spark plug change can be done without much effort, because there is direct access to the spark plugs. After opening the engine hoods, you can look directly at the spark plug connectors and do not have to dismantle any other components beforehand. Meanwhile, in newer cars, the fairing still has to be removed first.

The individual spark plug connectors are each assigned to a cylinder fixed and should therefore be reattached to the correct cylinder after the spark plug change. To avoid confusion, the plugs should be numbered beforehand, if there is still no clear assignment. The spark plug connectors can then be removed. After removing the plugs, the upper part of the spark plug can be seen, consisting of the connecting nut, the ceramic sheathing and the hexagon nut. To prevent dirt from getting into the cylinders after unscrewing the plugs, the spark plug well should be blown out with compressed air before unscrewing the spark plugs.

Next, the spark plug wrench is placed on the tightening nut and the spark plug is unscrewed with care,so that the thread in the cylinder head is not damaged. Subsequently, dirt in the area of the spark plug hole should be removed and the new spark plug carefully screwed in by hand. It is essential to ensure that the thread is screwed in correctly.

Now, using a torque wrench and the corresponding socket for spark plug wrench, tighten the spark plug to the correct tightening torque. Here it should be noted that the torque wrench also covers the correct Newton meter range (Nm). The correct torque is mandatory to perform according to the manufacturer's instructions with the torque wrench. Too low a tightening torque can possibly cause a loss of compression, as the spark plug does not seal the combustion chamber correctly. Breakage of the ceramic spark plug insulator is also possible, which can damage the piston, resulting in engine damage. Tightening the spark plug too tightly is also fatal. Here, on the one hand, the thread can be damaged in the worst case, the cylinder head.

Therefore, it is advisable to have the spark plug change performed by qualified personnel. Otherwise, it is necessary that you are informed professionally and properly before the assembly. When changing spark plugs, the installation instructions must be followed and the prescribed tightening torques must be observed.

If you have any further questions about changing spark plugs or buying spark plugs, you are welcome to contact our customer service with your vehicle data.