Learn more about quality spark plugs, find your car part, or find where to buy your auto part today. Here’s a guide for installing new wires if it’s time for replacements. It’s important to keep an eye on your spark plug wires to avoid subsequent engine issues. If a spark is present, the problem is probably in the distributor cap, rotor or spark plug wires. Crack the engine and check for a good spark at the spark tester. Attach the spark tester to the distributor end of the coil wire. If you did not see a spark, remove the coil wire from the distributor cap. Weak sparks are orange or red and may be hard to see in daylight. Check the fuel system and/or stark timing. If a good spark is present, the problem is probably not in the ignition system. This causes an increase in the voltage required to fire the spark plug, which could damage the ignition coil as well as the spark plug wires.Ī good spark will be blue-white and will be plainly visible in daylight. Vibration damage – Constant wear and tear caused by engine vibration can loosen the electrical connection at the spark plug.The following situations call for immediate replacement of spark plug wires: Look for any signs of melting or cracking. What to Look Forīe sure to first check spark plug wires for visual damage. In addition, the engine light coming on or visible damange to the cables can be signs of a failing wire. Common signs of failing spark plug wires include a decrease in power, acceleration, and fuel efficiency. This is necessary due to the aging of the spark plug wires from exposure to extreme temperatures (hot and cold), engine chemicals (oil, grease, coolant, etc.) and electrical stresses. Whether you do a complete tune-up or only change the spark plugs, spark plug wires (also known as ignition cables) should always be checked first.
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