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More Ignition lead set Parts

Ignition / Preheating auto parts: Spark plug wire

Spark plugs and ignition coil are connected to ignition cable. In the ignition coil voltage reaches 30,000 volts, so the spark plug wire is situated in an inaccessible place for people. Security must be respected under all conditions. Ignition cable must withstand big temperature spans and mechanical loads. All this is confirmed by the ISO certificate.

A very important point is the elimination of radio interference, which the voltage in the ignition system depends on. What system to use depends on the car brand. When choosing spare part, pay attention to the manufacturer technical characteristics. In the worst case faulty ignition cable may result in damage, in the best case it will malfunction. The easiest way out is to replace the original cable for a particular car model. However, the replacement is possible only if the ignition cable consists of separate parts. Car owner won’t be able to replace the ignition cable, as he needs special pliers to connect terminals to the ends of the cable.

If the problem is with ignition cable, it is possible to identify by voltage measurement. All this must do specialists. To replace the ignition cable you also need a special voltmeter. It is not difficult to replace the cable with a new one. Do you need McPherson strut, turn indicator, brake pads or brake shoes, timing belt, brake force regulator, tie rod, gear wheel or other spare part? In our web shop you will find any spare part you need.

How to detect malfunction of the ignition wires

Checking the component, start with visual inspection. Check wires' insulation (with ignition off). The joints and bends of the wires should not have any damage (cracks, scorch marks or holes).

Next, make sure there is no rust between the ignition coil and the wire terminals.

If no damage has been found, determine the degree of resistance. To do so, use a multimeter. Connect probes of the measuring device to both ends of the wire. The normal resistance is 3.5 to 10 kOhm. If the difference of wires' resistance within the same set exceeds 4 kOhm, the wires are to be replaced.

Next check the operation of the ignition wires with the engine started. Be careful as the ignition wires are under high voltage. If clicking sounds produced by electric current are heard, or there are sparks, the ignition wires are to be replaced. Ignition wires should be diagnosed no less than once in 3 months.

You may notice that ignition wires require diagnostics by the following symptoms:

  • Unstable idling of the engine, malfunctions;
  • No ignition;
  • The engine misses strokes at high RPM;
  • The engine misfires;
  • Increased fuel consumption;
  • Failures of the electronic devices;
  • Radio interference;
  • Troubled ignition;
  • Check Engine indicator activates on the dashboard;
  • High CO2 content in exhaust gas.

The reasons for ignition wires malfunction

Terminals oxidation is the result of exposure to moisture. This occurs due to the loss of tightness in the protective cap during operation or installation.

Open electric circuit occurs due to insecure connection with the terminals of the elements of the ignition system, or due to damaged electric conductors. This may also occur during dismantling of the ignition wires. The damaged point gets heated and produces sparks, which results in burning out of the electric conductor and metal terminals.

The reason of current leakage may consist in damaged insulation or protective caps of the ignition wire. The quality of the insulation material is crucially important, as the service life of the component depends on it greatly. Even microcracks may be the reason of weak current. The insulation layer gets damaged due to exposure to high or low temperatures, and to chemicals. Sometimes, the ignition wire sheath wears out due to constant contact with some component.

Replacing ignition wires

Damaged ignition wires are only to be replaced. The ignition wires should only be replaced with ignition off, and the engine cooled down. During the installation of a new set, order of wires connection should be reproduced exactly. Therefore, the best practice is disconnecting and connecting the wires one by one.

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  • Number of circuits: 6
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Ignition Cable Kit replacement | JANMOR ABU49 Parts Details
  • Material: EPDM (ethylene propylene diene Monomer (M-class) rubber)
  • Length 1 [mm]: 600
  • Length 2 [mm]: 640
  • Length 3 [mm]: 780
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  • Ignition Cable: Connector Type SAE
  • Outer diameter [mm]: 7
  • Distributor/ Rotor: Connector Type M4
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Ignition Cable replacement | BERU 7MMSRED Parts Details
  • Product line: COPPER CABLE
  • Colour: Red
  • Material: Copper, Silicone
  • Temperature range to [°C]: 220
  • Quantity Unit: Reel, Metre
  • Voltage from [V]: 38000
  • DIN / ISO: 3808
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Ignition Cable Kit replacement | BERU ZEF1480 Parts Details
  • Length 1 [mm]: 290
  • Length 2 [mm]: 335
  • Length 3 [mm]: 390
  • Length 4 [mm]: 425
  • Number of circuits: 4
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Ignition Cable Kit replacement | NGK 0941 Parts Details
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