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How to Test an NGK Spark Plug Connector

Spark plug wires from NGK are built for performance applications and visual appeal. NGK manufactures the wires to meet or exceed original equipment manufacturer specifications. A wire winding within the plug wire suppresses radio frequency interference generated whenever current passes through a wire. This RFI suppression prevents interference with the electronic engine controls. As the wires go bad, they lose the ability to suppress RFI and deliver ignition spark to the plug. Test the wires for continuity, resistance and proper operation.

Instructions

1

Remove the spark plug wire from the distributor and spark plug by grasping the boot at the end of the wire, twisting slightly and pulling to disconnect it.

2

Inspect the connectors on the wire within the spark plug and distributor boots. The connectors should be free of corrosion and moisture with no apparent distortion or discoloration.

3

Set a multimeter to check for resistance or ohms in the x100 range. Resistance is indicated by the Greek omega symbol. Turn the selector knob or scroll down through the options until the proper range is set.

4

Insert one of the meter probes in the distributor boot and the other probe in the spark plug boot on the wire. Make certain you have good contact between the probes and the connectors. Read the meter display. The display should read between 1,500 and 2,500 ohms of resistance per foot of wire. A reading more than 6,000 ohms per foot indicates a bad wire. NGKs low-resistance wires may have significantly less resistance, such as its Power Cable wires rated at 270 ohms per foot.

5

Grasp the plug wire by the boot and reconnect it to the distributor. Install a known good spark plug in the spark plug boot of the wire. Hold the threaded part of the spark plug against the engine block or a grounded area of the frame. Have a helper start the engine; inspect the spark produced by the plug. The spark should be blue with a strong audible report, or popping, as it fires. An orange spark with a weak report may indicate bad wire connectors.

6

Turn off the engine and remove the test plug. Grasp the plug wire by the boot and reconnect it to the spark plug installed in the engine. Firmly press the wire onto the plug and make certain it snaps into place.

7

Replace the plug wire if it fails the test in Steps 2, 4 or 5.

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