Why You Need to Change the Wires When Replacing Spark Plugs
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When looking over the manufacturer’s recommended maintenance intervals, you’ll likely see plenty about when to change the spark plugs – but what doesn’t get mentioned are the spark plug wires. Since they are responsible for delivering power to the plugs, the wires need to stay in great shape to do their job effectively. Otherwise, you could end up with many different problems, ranging from a malfunctioning radio to a rough idle. Wondering how that works? Here’s what you need to know.
Bad Spark Plug Wires = EM and RF Interference
Depending on your car’s build, spark plug wires typically run from the distributor to the spark plugs. They feature conductive material at the center shielded by heat-resistant insulation along the outside. In addition, it has a tiny spring inside the boot that helps decrease the risk of RF interference as your car runs.
Despite its heat resistance, the shielding material does wear down over time, as does the spring inside the boot. When that happens, the power can essentially leak out, resulting in electro-magnetic (EM) and radiofrequency (RF) interference.
Common Problems Caused by Old Spark Plug Wires
Electro-magnetic interference can get in the way of the proper operation of your car’s onboard computer and all its sensors. Your car may lose power or start to misfire, which can lead to the premature failure of vital components. Plus, without your engine management system working correctly, your car may stall out while driving and put you in a truly dangerous situation.
Radiofrequency interference, on the other hand, is not a safety issue, but it does prove frustrating. When it occurs, you might notice your radio making a loud ticking sound, for example, or otherwise malfunction as you try to listen to your favorite stations.
Spark plug wires can also fail internally, which often results in a rough idle, poor acceleration, and bad gas mileage. Eventually, your car may fail to startup altogether, leaving you stranded until you find the problem and replace the wires.
When to Change Your Spark Plugs and Wires
Like all maintenance services, the ideal interval for changing your spark plugs and wires depends on the manufacturer’s recommendations. Most cars need them done at 30,000 to 60,000 miles, while others are good until 100,000 miles. The most important thing to remember is to change the wires when you do the spark plugs.
If you’re not sure when to change the spark plugs and wires, just ask your Gilbert AZ auto tech when to come in. They can also let you know when to complete other vehicle maintenance services, so you can keep up on the care of your car.
Call APA Total Car Care for All Your Vehicle Maintenance Needs
If you need your spark plugs and wires replaced or any other vehicle maintenance services, just dial 480-282-8300 or fill out our online form to reach our team at APA Total Car Care. We will help you find a convenient time to bring your car into our Gilbert AZ auto repair shop. Our team can then perform a full inspection, complete your maintenance services, and let you know if your car needs anything else to stay in great condition. Make sure to ask about our rewards program during your visit!
APA Total Car Care Work
We recently had a vehicle come in to our shop for a tune up. Upon further inspection of the spark plugs we noticed the bad spark plug wires.
To keep up with APA Total Car Care Repairs, Products, Services and Shop News follow us HERE. If you have any questions, send a message. We would love to hear from you!
Andrew Harris
Andrew Harris grew up in the bays of Automotive Excellence, the Seal Beach repair shop his father Joe opened back in 1981. When he officially stepped in as owner in 2005, Andrew carried on the family tradition with the same philosophy: deliver reliable auto care built on honesty and craftsmanship. What began as one small shop has grown into two Seal Beach locations, giving local drivers dealership-level service with a family-run feel.
Under Andrew’s leadership, Automotive Excellence has earned AAA Approval and built a team of ASE-Certified and Master technicians. From hybrid diagnostics to precision alignments, auto electrical repairs, and everything in between, his crew uses cutting-edge tools and training to tackle today’s most complex vehicles.
For Andrew, cars are only part of the story. He sees customers, vendors, and employees as neighbors first, and works to make every interaction built on trust and respect. Whether he’s sharing maintenance tips online or talking through a repair at the counter, his goal is to make car care clear, stress-free, and dependable for the Seal Beach community he proudly serves.
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