Damage patterns on ignition cables

A scorched ignition cable indicates that it was routed too close to hot components.
A scorched ignition cable indicates that it was routed too close to hot components.

Scorched ignition cable or connector

This ignition cable was routed too close to hot engine parts.

Such damage or disconnecting can result from frequent misfiring or if moisture penetrates the connector.
Such damage or disconnecting can result from frequent misfiring or if moisture penetrates the connector

The spark plug contact in the connector is damaged.

Such damage or disconnecting can result from frequent misfiring or if moisture penetrates the connector. Incorrect installation can also result in such defects.

Torn cable indicates that it was pulled off improperly.
Torn cable indicates that it was pulled off improperly

Torn cable

Here, the connector is torn from the cable - as a result of incorrect removal.

Motor oil can damage the outer sleeve of the ignition cable.
Motor oil can damage the outer sleeve of the ignition cable

Soiling with motor oil

Motor oil can damage the outer sleeve of the ignition cable.

Improper installation of the ignition cable can lead to the arc-over occurring next to the actual contact.
Improper installation of the ignition cable can lead to the arc-over occurring next to the actual contact

Incorrect arc-over

As can be seen on this (cut open) connector, the spark arced over next to the actual spark plug contact. This is the result of incorrect installation.

Oxidised contacts indicate that the ignition cable set is not firmly seated.
Oxidised contacts indicate that the ignition cable set is not firmly seated

Oxidised plug contacts:

Moisture has penetrated as a result of a loose connection. The oxidized contacts cause an increase in the resistance of the ignition cable and prevents optimal ignition.

Overageing of the exterior casing can lead to tears.
Overageing of the exterior casing can lead to tears

Overageing

Due to overageing, the outer sleeve of this cable is cracked and brittle. Ignition voltage can flow to ground, which is undesirable.

A deformed plastic sleeve is an indication of faulty installation in the engine bay.
A deformed plastic sleeve is an indication of faulty installation in the engine bay

The plastic sleeve is deformed:

Probably due to incorrect routeing in the engine compartment. It would be advisable to replace the ignition cable, even if it still functions - for the time being.

Defective plastic casings usually arise from improper installation with inappropriate tools.
Defective plastic casings usually arise from improper installation with inappropriate tools

Plastic sleeve is defective:

This is often the result of incorrect installation, for example when the ignition cable was pressed on using a screwdriver. In any case, the cable must be replaced.

Defective plastic casings usually arise from improper installation with inappropriate tools.
Plastic sleeve is defective

Defective plastic casings usually arise from improper installation with inappropriate tools.

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