Back to all

Plugging Away (Spark Plug Replacement)

July 28, 2025

If you drive a vehicle with a gasoline engine, thank the spark plugs for igniting the gasoline/air mixture in each cylinder that keeps your vehicle traveling smoothly down the road every day.  Your spark plugs work hard, firing thousands of times in a well-choreographed order, and you usually don't pay much attention to them until one of them stops working the way it should.

Signs that spark plugs are wearing out include:

  • Engine runs more roughly than it did
  • Vehicle doesn't start as easily as it used to
  • Vehicle hesitates when you press on the accelerator
  • Your fuel economy has gotten worse

When a spark plug stops working altogether, you will find your engine has likely lost a lot of its power and isn't running smoothly.  Your Check Engine light may  come on.  Then it's time to head to come to our service center to have it diagnosed.

If your plugs need to be replaced, they're usually done all at the same time. And if your vehicle has spark plug wires, experts recommend you change them as well. Different type of spark plugs last longer than others, and your service advisor can discuss what's best for your vehicle and driving habits.

A technician will also determine if there are any carbon deposits on your plugs, how healthy the ignition coil is (it's the part that supplies the high-voltage jolt that makes the spark) and will look for other signs and symptoms that may point to other problems in your engine. For instance, if a spark plug is fouled by oily deposits, it's possible oil is getting into the combustion chamber. 

They will also check all the plugs to see if there are problems in just one or all cylinders.  Sometimes a technician will find a plug that has overheated, literally melting the metal.  In that case, they may recommend they correct that problem before replacing the spark plugs.

Most spark plugs will last for a good, long time.  Even if you aren't seeing any symptoms they're wearing out, make sure you have your service advisor check your vehicle manufacturer's recommended maintenance intervals.  Preventative maintenance will keep your vehicle running reliably so you can count on it to get you where you want to go. 

Charlie's Fast Lube Jackson
1901 E. Jackson Blvd.
Jackson, Missouri 63755
575-243-2226
http://www.charliesfastlubejackson.com

Need Service?

Request a Quote

More articles from Charlie's Fast Lube Jackson

Don't Neglect Your Spare (Spare Tire Care)

January 11, 2026

If you've ever had a flat tire, then you know welcome it is to have a spare tire that is properly inflated, in good shape and easy to get to. Problem is many of us don't even give our spare tire (if we even have one) a second thought. If you have an SUV or truck with a spare, it may be mounted o... More

How Much Does It Cost? (Variations in Vehicle Repair Costs)

January 4, 2026

Ever wonder why it costs so much more to fix a similar problem in two different vehicles? Let's say you now own an SUV and before that, you owned a car. Your SUV's air conditioning system needs a new evaporator, but the cost for the new one is way more than you remember it was for your car. How... More

The Edible Engine

December 28, 2025

You may have had a friend whose vehicle was the victim of hungry rodents. After all, mice, rats and squirrelseven rabbitshave been known to gnaw on wires in engine compartments, causing vehicle electrical systems to go haywire. They can disable a vehicle completely and be very expensive to fix.... More