If there’s no light, the spark plug isn’t receiving an electrical charge, which could be due to a faulty spark plug wire, bad ignition coil, or damaged remote coil pack.With the engine running, look for a spark in the spark tester gap.Now, reconnect your battery and crank your engine.Attach the tester to the spark plug wire and an engine ground.Get hold of a spark plug tester to perform these steps:
If there’s no visible damage, use a spark plug tester or the spray test to check for electrical arcs around the plug wires.Ĭaution: Since you’ll be doing these tests with the engine running, don’t touch any spark plug wire to prevent high voltage shocks. Many modern vehicles use a coil on plug ignition that doesn’t require a long wire to connect the ignition coil to the spark plug. If you notice any sign of damage, it’s time to replace your spark plug wire with a new wire. Next, look for corrosion between the boot, the spark plug, and the coil.This’ll protect the electrical connectors from corrosion and dirt. If there’s no discoloration, you could apply some dielectric grease around the inner wall of the boot.Note: Also known as an ignition boot or plug wire boot, a spark plug boot connects the ignition cable to the spark plug. Next, check the spark plug boot for any discoloration or damage in the area where the connection was made.Lack of wire insulation can allow the voltage to jump to ground, and the spark plugs won’t be able to power the ignition. Clean the wire with a cloth and look for any cuts or scorch markings on the silicone insulation.Remove the spark plug wire using pliers.Each plug wire comes out of the cylinder head at one end and is attached to a distributor (and ignition coil) or coil pack on the other end. Pop your car’s hood and locate the spark plug wires on the engine block.Visually inspect each spark plug wire for any corrosion or insulation loss signs.
Best spark plug wires how to#
That said, let’s proceed with how to test spark plug wires.
Best spark plug wires professional#
So, if you’re not familiar with the engine block, it’s best to call an auto repairs professional to test the spark plug wires for you. Some of these tests require a running engine, and any misstep could lead to a high voltage electric shock. This helps maintain the firing order of your ignition system and prevents any misfire. Important: While troubleshooting these spark plug wire sets, check each wire separately and reconnect it before moving on to the next.
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