Spark plug wire manifests its importance to the VW Jetta as the link of the spark plug to the ignition coil or the distributor. This type of wire is made to sustain a lot of resistance such as reducing radio static that the ignition system is generating. The design of this wire is to carry huge amount of voltage to the ignition system, approximately 30,000 volt or more.

For this reason, it is not recommended to substitute it with non-resistance wires. The ignition system is designed to work with resistance wires only.

Trying the resistance ability of the spark plug wires is very much suggested. VW Jetta owners can usually access it through the factory service manual which will provide the resistance rating such as 1000 to 4000 ohms per foot and by using the multi meter. Measuring the wire through its end points in accordance to its specification will do if no certainty of ohms metering transpires. By means of the manual, it will reveal that the wires crosses each other rather than in parallel lines because of canceling the magnetic fields. Induction of voltage to another wire will be the effect if a parallel application has done. Misconnection of these wires will surely bring you in huge trouble such as hard-starting, miss-firing or poor-fuel economy. That is why connecting these wires should be done one at a time to keep them from wire mix-ups. Aside from that, a little amount of dust can also cause misconnection since it might form conduction for high voltage when moisten.That is why regular check-up to this VW Jetta spark plug wires is advised to ensure the condition of the wires.