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Non-resistor Spark Plugs
On a Honda engine, if the stock spark plugs have been replaced, it is very
important to ensure that the replacement spark plugs have an integral resistor.
Non-resistor spark plugs cause a large amount of electrical interference which
may effect vehicle electronics, including the ECU.
Resistor spark plugs use an integral resistor to absorb the radio frequency
energy generated from the spark. In earlier Honda engines the resistor was
often incorporated into the distributor cap or spark plug wires. With the
K-Series engine the only place for the resistor is in the spark plug. Almost all
spark plugs are of the resistor type (actually we were surprised that people
could still buy non resistor type plugs).
For more information:
Spark Plugs that can be used
You can purchase resistor type spark plugs from
www.sparkplugs.com
| Heat Range |
Stock # |
NGK Part # |
| 8 |
2668 |
BKR8EIX |
| 9 |
2669 |
BKR9EIX |
| 10 |
4017 |
R6601-10 |
Some of these are for race use only and will not work in daily driven
applications.
Oscilloscope Waveforms - Non-resistor
spark plugs
DC voltage waveform for the ECU power supply. The vertical scale is 20V
per division. The red line is the trigger (at 80V). The voltage spike was in the
order of 100V to 200V peak to peak.
DC voltage waveform for the ECU internal 5V power network. The vertical
scale is 20V per division. The red line is the trigger (at 80V). Again the
voltage spike was in the order of 100V - 200V peak to peak.
Oscilloscope Waveforms - OEM spark plugs
DC voltage waveform for the ECU power supply. The vertical scale is 10V
per division. The largest voltage spike was very small - less than 0.4V
Conclusion
Non resistor spark plugs cause massive radio frequency interference which can
affect any electronics in the vehicle. There is no need nor advantage in
using non-resistor spark plugs.
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