When changing spark plugs, you should also inspect and potentially replace the ignition coils/boots (especially if hard to access or showing wear), spark plug wires (if your car uses them and they look old/brittle), and consider checking/replacing the valve cover gasket if you see oil, while also applying dielectric grease to coil boots and using anti-seize on threads (if plugs aren't pre-coated) for easier future removal.
Spark Plug Wires: You may be able to reuse your existing spark plug wires after replacing old, damaged or ineffective plugs. Still, your plug wires are essential components. If you notice signs of wear and tear or other damage, replacing spark plug wires when you add new spark plugs is a good idea.
It's not generally necessary to replace spark plugs and ignition coils at the same time, although it could make the process of working on them easier.
A typical tuneup includes an oil change, tire rotation, and inspection of components, including spark plugs, belts, hoses, and more.
Here are some tell-tale signs that your vehicle may be due for a tune-up:
However, if you want a full tune-up involving an oil change, air filter check, distributor cap check, rotor check, PCV valve check, fuel filter check, and all systems getting a cursory examination, this variety of tune-up may cost between $200 and $800.
Symptoms of a bad ignition coil include engine misfires (sputtering, jerking), rough idling, poor acceleration, reduced fuel economy, hard starting, and the check engine light coming on, often with codes like P0300. You might also notice backfiring, a smell of gas, or the engine stalling unexpectedly, as the coil fails to provide a strong spark to ignite fuel.
Another benefit of replacing your spark plugs is improved engine performance. Fouled spark plugs can cause your engine to misfire, leading to a loss of power and efficiency. Replacing your spark plugs will help ensure that your engine is running at peak performance.
WD-40 Multi-use Product is ideal for cleaning spark plugs. Spray WD-40 Multi-use Product on a microfiber cloth and rub over the spark plug. You can even spray WD-40 directly on the spark plug & then wipe it down using a soft, clean cloth.
Do not use anti-seize or lubricant on NGK spark plugs. It is completely unnecessary and can be detrimental. Corona stain is a light brown or tan discoloration on the outside of the ceramic insulator above the metal shell/hex.
START UP THE ENGINE
Starting the engine after the spark plug replacement is a good way to validate your work. Note: If your Check Engine Light is on, you can drive your vehicle to your local AutoZone store and have the code translated. If the Check Engine Light 'flashes' there is a cylinder miss-fire.
Before you reinstall the spark plug, apply a minimal amount of grease to the threads. The grease will help prevent corrosion and make it easier to remove the spark plugs in the future. Tighten the spark plug by hand until it is snug, and then use a torque wrench to finish tightening. Avoid over-tightening it!
Spark plug lifespan varies significantly by type — copper plugs may need replacement every 25,000-30,000 miles, while platinum or iridium plugs often last 100,000 miles or more.
A Noticeable Difference
Once your vehicle receives new spark plugs, you'll notice how much better your car feels while driving. You may notice such improvements as: Consistent and Optimal Combustion – Spark plugs that are in peak condition allow the combustion system to function at its highest potential.
Faulty Spark Plugs or Ignition Coils: Do You Need to Replace One...
Despite how hard ignition coils work, they have a relatively long expected lifespan of 80,000 to 100,000 miles. But eventually, the coils in your engine will start to wear out.
This can be a result of incorrect spark plug installation or the use of incompatible spark plugs. Rough Idle: The engine may have a rough or uneven idle, where it feels like it is struggling to maintain a steady RPM. This can be a sign of spark plugs that are not properly gapped or of poor quality.
Have a Misfiring Engine? Learn the Top 5 Possible Causes
DIY. Labor can be the biggest factor in the cost to replace spark plugs, with prices ranging from $40 to $150 per hour. While the allure of saving money with a DIY spark plug change is appealing, the reality of modern engines can make the job more complex than it seems.
Signs to Tell If Your Spark Plugs Need to Be Replaced
When we talk about a simple tune-up, we're basically talking about five things: changing spark plugs, ignition wires, O2 sensors, and air and cabin filters. These are well within the ability of even a novice do-it-yourselfer.