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Ignition and preheating car spares

Glow plug system car spares for Top Car brand

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Ignition system car parts - all important information about operating method, mounting, diagnostics and service life

Ignition and preheating systems are directly involved in starting the engine and also perform different functions. The former is used in petrol engines and is designed to produce a spark that ignites the air-fuel mixture. The latter is used in diesel engines. Its main function is to heat up the air in the combustion chambers (swirl chamber or prechamber) to make starting a cold engine easier. This is especially important at low ambient temperatures.

Design of ignition and preheating systems

The operating principle of an ignition system consists in converting the low voltage of the onboard system into high voltage and producing a spark for ignition of the air-fuel mixture. The voltage is converted by an ignition coil. The current it creates is transferred to the distributor and then, through high-voltage cables, to the spark plug of the corresponding cylinder. A high voltage discharge is produced between the spark plug electrodes. The system also includes a relay and sometimes a contact breaker, which is also involved in controlling the system. Modern cars are often equipped with a distributorless ignition system (DIS) which has one ignition coil per spark plug and is connected to it directly, without any high voltage cables.

A preheating system has a different working principle. The glow plugs used in it are electric heating devices. Their operation is controlled either by a relay or by a separate control unit. When the glow plugs are on, the corresponding indicator lights up on the dashboard.

Maintenance tips

  • Make sure all cables and connectors are properly attached. For example, incorrectly connected high-voltage cables may cause the ignition coil, contact breaker, or other components to burn out.
  • Don’t leave the ignition on for a long time with the engine shut down. This may result in overheating of the coil, a burnt-out resistor, or a loosened contact breaker spring.
  • Don’t leave the engine idling for a long time. This results in increased build-up of soot on the spark plugs.
  • Observe the tightening torque specified by the manufacturer when installing new spark or glow plugs. Don’t apply too much force if the component gets stuck. This is especially true for glow plugs, which are easy to break. To remove them, the first thing to do is to grease the thread area with synthetic oil and leave it overnight. Then start the engine or supply power to the working components to let them warm up. After that, you may try to unscrew them, but remember to follow the recommended tightening torque. If you still can’t unscrew the components, heat them up again. Use a special reamer to clean glow plug holes.
  • Only use high-quality fuel. Otherwise, your spark or glow plugs will soon be covered with soot.

Signs of malfunction

Detecting ignition and preheating systems malfunctions is not that easy, as most of them have similar symptoms. For example, difficulties in starting a petrol engine or the inability to start it at all may indicate damaged high-voltage cables, a faulty ignition coil or spark plugs, a defective distributor cap or sensors, or a faulty timing advance mechanism or electronic control unit. All these issues may come with reduced engine power and increased fuel consumption.

No matter which component of the preheating system is faulty, all diesel vehicles have problems with starting a cold engine. The engine may idle rougher than usual.

Causes of malfunction

Low-quality fuel, wear and tear of piston rings and valve stem seals, or an incorrect ignition advance angle may cause soot deposits on the spark plugs. If power leads are damaged, the ignition coil may overheat. Malfunction of preheating system components might be caused by clogged fuel injectors. Furthermore, parts of ignition and preheating systems often fail due to voltage fluctuations in the vehicle’s electrical system.

Autodoc.co.uk: only high-quality automotive products

You can buy components for ignition and preheating systems at our online shop. With the wide product range presented at our catalogue, you’ll find the right parts for your vehicle quickly and easily.

Replacement of Glow plug system car parts: Video repair guide

Top 10 of best sellers from the Ignition and preheating section

Recommended spare parts from the Ignition and preheating components section. These are the sales hits. Buy our best sellling items or discover a vast selection of other attractive offers.
-25%
Buy Spark Plug NGK 95770 - Glow plug system parts online
Spark Plug
Article number: 95770
£ 12,52

(Price per item)

incl. 20% VAT , excl. delivery costs,
  • Spanner Size: 14 mm
  • External Thread [mm]: 12,0
  • Thread Length [mm]: 26,5
  • Spark Position [mm]: 5,0
  • Spark Plug: Iridium Middle Electrode, 1 - Earthed Electrode, interference Suppression 5 kOhm, with gasket seat
  • Version: Bi-Hex
  • NGK  Spark Plug
  • Item number  95770
  • Our price   £ 12,52
  • Condition  New
Details
-25%
Buy Control Unit, glow plug system BOSCH 0 281 003 039 - Ignition system parts online
Control Unit, glow plug system
Article number: 0 281 003 039
£ 27,05
incl. 20% VAT , excl. delivery costs,
  • BOSCH  Control Unit, glow plug system
  • Item number  0 281 003 039
  • Our price   £ 27,05
  • Condition  New
Details
-25%
Buy Spark Plug DENSO SC16HR11 - Ignition and preheating parts online
Spark Plug
Article number: SC16HR11
£ 12,02

(Price per item)

incl. 20% VAT , excl. delivery costs,
  • Spanner Size: 14
  • Thread Length [mm]: 26,5
  • Spark Plug: 1 - Earthed Electrode
  • Product line: Iridium
  • Tightening Torque [Nm]: 17
  • Diameter [mm]: 12
  • Weight [g]: 42
  • DENSO  Spark Plug
  • Item number  SC16HR11
  • Our price   £ 12,02
  • Condition  New
Details
-25%
Buy Spark Plug DENSO K20TT - Glow plug system parts online
Spark Plug
Article number: K20TT
£ 3,45

(Price per item)

incl. 20% VAT , excl. delivery costs,
  • Spanner Size: 16
  • Thread Length [mm]: 19
  • Spark Plug: 1 - Earthed Electrode
  • Product line: Nickel TT
  • Tightening Torque [Nm]: 22
  • Diameter [mm]: 14
  • Weight [g]: 43
  • DENSO  Spark Plug
  • Item number  K20TT
  • Our price   £ 3,45
  • Condition  New
Details
-25%
Spark Plug DENSO IKH24 - Ignition system spare parts order
Spark Plug
Article number: IKH24
£ 11,91

(Price per item)

incl. 20% VAT , excl. delivery costs,
  • Spanner Size: 16
  • Thread Length [mm]: 26,5
  • Spark Plug: 1 - Earthed Electrode
  • Product line: Iridium Power
  • Tightening Torque [Nm]: 22
  • Diameter [mm]: 14
  • Weight [g]: 48
  • Country-spec. model: Japan
  • DENSO  Spark Plug
  • Item number  IKH24
  • Our price   £ 11,91
  • Condition  New
Details
-25%
Spark Plug BERU Z332 - Ignition and preheating spare parts order
Spark Plug
Article number: Z332
£ 11,18

(Price per item)

incl. 20% VAT , excl. delivery costs,
  • 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
  • Product line: ULTRA
  • Connector type: SAE
  • Technical Information Number: 12 ZR-6 SPP2-1
  • Tightening torque from [Nm]: 15
  • Tightening torque to [Nm]: 25
  • BERU  Spark Plug
  • Item number  Z332
  • Our price   £ 11,18
  • Condition  New
Details
-25%
Control Unit, glow plug system BERU GR070 - Glow plug system spare parts order
Control Unit, glow plug system
Article number: GR070
£ 100,93
incl. 20% VAT , excl. delivery costs,
  • Specification: << 5 Sec., >> 0 Sec.
  • Voltage [V]: 12
  • Number of Cylinders: 4
  • BERU  Control Unit, glow plug system
  • Item number  GR070
  • Our price   £ 100,93
  • Condition  New
Details
-25%
Spark Plug NGK 91970 - Ignition system spare parts order
Spark Plug
Article number: 91970
£ 19,44

(Price per item)

incl. 20% VAT , excl. delivery costs,
  • Spanner Size: 14 mm
  • External Thread [mm]: 12,0
  • Thread Length [mm]: 25,0
  • Spark Position [mm]: 3,5
  • Spark Plug: Fixed SAE connector, Iridium Middle Electrode, 1 - Earthed Electrode, interference Suppression 5 kOhm, with taper gasket seat
  • NGK  Spark Plug
  • Item number  91970
  • Our price   £ 19,44
  • Condition  New
Details
-25%
Ignition and preheating parts - Spark Plug DENSO IK22
Spark Plug
Article number: IK22
£ 11,29

(Price per item)

incl. 20% VAT , excl. delivery costs,
  • Spanner Size: 16
  • Thread Length [mm]: 19
  • Spark Plug: 1 - Earthed Electrode
  • Product line: Iridium Power
  • Tightening Torque [Nm]: 22
  • Diameter [mm]: 14
  • Weight [g]: 43
  • Country-spec. model: Japan
  • DENSO  Spark Plug
  • Item number  IK22
  • Our price   £ 11,29
  • Condition  New
Details
-25%
Glow plug system parts - Glow Plug BERU GE105
Glow Plug
Article number: GE105
£ 11,99

(Price per item)

incl. 20% VAT , excl. delivery costs,
  • Thread Size: M8x1,0
  • Length [mm]: 149
  • Voltage [V]: 4,4
  • Product line: ISS
  • Spanner Size: 8 mm
  • Glow Plug Design: after-glow capable, Pencil-type Glow Plug
  • Fitting Depth [mm]: 27
  • Connector type: 4 mm PIN
  • Current Strength [A]: 25
  • Tightening torque to [Nm]: 10
  • Tightening torque from [Nm]: 8
  • Cone Pitch: 93
  • Failure Moment [Nm]: 20
  • BERU  Glow Plug
  • Item number  GE105
  • Our price   £ 11,99
  • Condition  New
Details