Get 5% off in-app
400k+ download
Open app

How to change spark plugs in a car?

Spread the love

Looking to change the spark plugs in your vehicle? Here’s a detailed guide on how to change spark plugs in a car without any hassle.   

Changing your car’s spark plugs is no rocket science, and you can replace them yourself with the right techniques and knowledge to save money. In this post, we’re breaking down everything there’s to know about spark plugs and how to change them. Keep reading to know more.   

What’s a spark plug? 

The spark plug is an important component in the vehicle’s ignition system. The spark plug ignites the air and fuel mixture inside the combustion chamber to ignite the car. In short, spark plugs play a vital role in starting your car. Therefore, don’t forget to include spark plug replacements in your car maintenance schedule.   

How to change spark plugs in a car - picture of a spark plug

What are the signs of a faulty spark plug?   

Here are the top signs that point towards faulty spark plugs:   

  • Your car has a rough idle  
  • You have trouble starting your car  
  • You notice the engine misfiring  
  • The fuel consumption becomes high   
  • There’s an inconsistency in your car’s performance  

How often should you change spark plugs?   

Car wash experts recommend changing your spark plugs every 30,000 miles. However, this number can change depending on the manufacturer and how you drive. You can refer to the vehicle owners’ manual or consult with a car mechanic to find the right interval for spark plug replacement.   

How much does spark plug replacement cost?  

Spark plugs can cost you anywhere between $2 to $20. To change your spark plugs professionally, you need to pay $50 – $200. However, you can save this expense by changing the spark plugs at home.   

How to change spark plugs in a car – A step-by-step guide  

Use our step-by-step guide and change the vehicle’s spark plugs without hassle.   

Step 1   

Begin the spark plug replacement process by parking the vehicle on a flat surface. Make sure the engine is cool before making contact. Clear the dirt and debris in the engine. You don’t want them to get into the cylinder.  

Step 2  

Now locate the spark plugs to remove them. You will notice a bundle of 4-8 wires when you open the hood. The spark plugs are located at the end of each wire. You can refer to the owners’ manual to know the precise spot.   

Step 3  

Remove the wire plug carefully from the engine to reveal the spark plug. Next, using a socket wrench with an extension, remove the spark plug. Check the condition of the plug. If it appears damaged, replace it. Make sure you change one plug at a time and keep track of the order. You can cause engine damage by crossing the wire to the wrong plug. If you work on more than one plug at a time, label them numerically.   

Step 4  

You can find different spark plugs in the market. Get the right replacement spark plugs that fit your vehicle. The best thing would be getting the same spark plug your manufacturer has installed. You can also buy adjustable gap spark plugs, in which you can make slight adjustments to the gap.  

Step 5   

This is also the right time to clean the wires and terminals. Use a brush and compresses air to clean the area and remove any dirt. If you find the wire worn out, replace them. 

Step 6  

Now install the new spark plugs using a ratchet. Remember not to over-tighten it – you can damage the plug. Fix the wires back on the spark plugs and close your hood.   

Get access to Unlimited Car Washes from Way.com

Read our blogs for information on the best airport parking and hourly parking spots near you and the most affordable insurance for your car.

Related Posts


Press ESC to close