Spark plug wire replacement has not gone out of style. As drivers keep their cars longer, replacement is needed eventually. Show
The spark plug wire conducts high-voltage pulses from the ignition coil or distributor to the spark plug, keeping that voltage, 10,000 to 30,000 volts, from arcing elsewhere. Spark plug wires wear out internally because this high voltage burns them out, and they deteriorate externally due to high heat, exposure and abrasion. Even the best mousetrap or cat can’t keep rodents from sneaking into your engine bay and chewing spark plug wires. The result could be rough idling, poor performance, poor fuel economy or illuminated check engine lights. Due to age, mileage, wear or damage, spark plug wires need to be replaced to restore engine performance. But how can you tell if you need new spark plug wires, and what’s the best way to replace them? Testing Spark Plug WiresTo test spark plug wires for failure or weakness, try the following methods:
Spark Plug Wire Replacement Pro TipsReplacing spark plug wires is a matter of removing the old and installing the new, but don’t get ahead of yourself. Here are three tips to get the job done well:
Some spark plug wires last upwards of 300,000 miles, but there’s no recommended spark plug wire replacement interval. It’s a good idea to check spark plug wires during spark plug replacement or at least every 30,000 miles. Check out all the ignition system parts available on NAPA Online or trust one of our 17,000 NAPA AutoCare locations for routine maintenance and repairs. For more information on spark plugs, chat with a knowledgeable expert at your local NAPA AUTO PARTS store. Photo courtesy of Pixabay. Benjamin Jerew View AllBen has been taking things apart since he was 5, and putting them back together again since he was 8. After dabbling in DIY repairs at home and on the farm, he found his calling in the CGCC Automobile Repair program. After he held his ASE CMAT for 10 years, Ben decided he needed a change. Now, he writes on automotive topics across the web and around the world, including new automotive technology, transportation legislation, emissions, fuel economy and auto repair. Many drivers assume that when their car has trouble starting, there’s a problem with the battery. While this certainly could be the case, it’s not the only possibility. Old or faulty spark plugs could be the culprit! After all, these small spark plugs have a big job to do. Learn why it’s important to keep this part of your car in great working order and when to change spark plugs by watching for these bad spark plug symptoms. Changing spark plugs could be a good idea when...1. Your check engine light comes on.Worn/failed spark plugs, coil packs, or spark plug wires can trigger your check engine light to come on. In today's cars, say Firestone Complete Auto Care technicians, if a plug starts to fail then the most obvious event should be the check engine light coming on or even flashing. This can cause your engine to misfire and your check engine light to pop on. A flashing engine light could mean that potentially catastrophic misfires are taking place, say our technicians. In general, it's best to replace spark plugs as part of preventative maintenance based on manufacturer's specifications. This can help save you from costly repairs, as driving with misfiring spark plugs could put undue stress on your car's catalytic converter (the engine's exhaust cleaner). Symptoms of misfiring spark plugs include rough idling, uneven power when accelerating, and an increase in exhaust emissions. Note that a check engine light could be potentially caused by a number of things, not just a spark plug problem. That's one reason your local Firestone Complete Auto Care offers Code Scans, which reveal any codes that indicate a misfire due to a spark plug failure. Since our facilities provide complete auto care, our technicians also have the proper tools and expertise in engine control systems, sensors, and on-board diagnostics to perform an advanced diagnostic and provide an accurate repair estimate. 2. Your car has trouble starting.Your spark plugs have one of the most important jobs in your vehicle, which is to provide the spark that powers the engine! Old, worn out spark plugs have a harder time creating the spark that actually powers your engine. If your car stalls when you are trying to turn it on, there could be a problem with spark plugs or damaged spark plug wires. The battery is most likely the culprit if your car has no power and won't start at all. 3. You’re filling up the gas tank more often.If your spark plugs are on their last leg, they’ll take it out on your gas mileage. Worn out spark plugs can increase your vehicle’s fuel consumption because they won’t effectively burn the fuel that goes into the engine, meaning you’ll be shelling out more money on fill-ups. "A misfiring spark plug can reduce fuel efficiency by as much as 30%," reports the National Institute for Automotive Service Excellence. In general, keeping your car tuned up can work wonders for your fuel efficiency. "Fixing a car that is noticeably out of tune or has failed an emissions test can improve its gas mileage by an average of 4%," reports FuelEconomy.gov. 4. The engine idles roughly (and you can hear it!).Typically (hopefully!) your engine probably purrs like a kitten, but turn down your music and take a listen. If you notice that the engine is making rattling, pinging, or knock-like noises, your spark plugs might be to blame. 5. Your car won’t accelerate quickly.You’re probably pretty familiar with how your vehicle handles and drives. If you notice that your car isn’t as responsive as normal, particularly when you’re trying to accelerate, this could be traced back to worn spark plugs. It might be time to have them replaced – no one likes driving a sluggish, fuel-guzzling car. 6. Per the manufacturer, it's time!In any car care matter, it's always best to follow the Manufacturer Suggested Maintenance Schedule. Review your vehicle's suggested maintenance schedule to see when to replace your spark plugs. Luckily, spark plugs don’t wear out very quickly. You can typically get 80,000 miles on them before they need replacing. But if you notice any of these symptoms, it’s time to get your spark plugs checked out with an engine tune up. Continuing to drive on worn out or damaged spark plugs can ultimately cause engine damage, so don’t put it off. Make an appointment at your local Firestone Complete Auto Care so our expert technicians can see exactly what’s going on! When should you change your spark plugs?
What are the signs of a bad spark plug?When looking at the electrode on your spark plugs, keep in mind the following:
How do I know if my spark plugs need replacing?Symptoms That Your Spark Plugs Need Replacing
When is it time to replace my spark plugs?When to replace spark plugs
How many years do spark plug wires last?A quality set of spark plug wires can generally last around 60,000 to 70,000 miles. Again, it is a good idea to replace these parts prior to a failure, like a misfire. A vehicle that is running rough or misfiring can cause catalytic converter damage.
How do I know if I need new spark plug wires?The most obvious sign of faulty spark plug wires is your vehicle just feels a little 'off. ' It would probably start slowly with reduced gas mileage but could progress to no acceleration. Faulty spark plug wires or spark plug misfires can also cause problems starting your engine, a rough idle, and loss of power.
Does changing spark plug wires improve performance?In most cases, you'll see a noticeable difference in performance after replacing your spark plugs and wires. The engine will run smoother and faster, and the car will have better acceleration. You may also notice an improvement in fuel economy.
Do spark plugs wires deteriorate with age?Due to the constant use that the spark plug wires on a car gets, they will wear out over time and can cause a variety of different issues. The ignition cables on a car are made to last about 60,000 miles before they have to be replaced.
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