Kia 2004.5 Spectra Service Technical Training page 135

2004.5 Spectra Technology
VOLTAGE REQUIREMENT
Driveability
This chart represents the voltage required by both
normal and Iridium power spark plugs to perform 4
engine-operating conditions. In all four cases the
Iridium required less voltage. Using Iridium on the
surface area of the center electrode causes it to be
reduced. A typical platinum plug has a 1.1mm
diameter center electrode while an Iridium plug may
measure 0.4mm in diameter, decreasing the voltage
requirements. The ignition coil also benefits by lower
high voltage output demands and cooler operation.
The spark plugs are located on the top of the cylinder
head and are accessed by removing the cover and
ignition cables, which lead to 2 ignition coils on the
right side of the head.
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