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Jeep Spark Plug Replacement

jeep spark plug replacement

As a Jeep owner, you probably know the importance of spark plugs in your vehicle’s engine. Spark plugs generate the much-needed spark to ignite the air-fuel mixture, which is responsible for powering the engine while keeping the vehicle running smoothly.

But over time, spark plugs can wear out and become less effective than they should. This article will provide a step-by-step guide on the Jeep spark plug replacement process, should you want to know it.

Jeep Spark Plug Replacement – Step by Step

What You’ll Need:

  • New spark plugs
  • Socket wrench with a spark plug socket
  • Extension bar
  • Spark plug gap tool
  • Ante-seize compound
  • Dielectric grease
  • Torque Wrench
  • Wire brushed on compressed air (optional)

Step 1: Parking your Jeep Properly

It is essential to park your Jeep on a level surface to ensure you are safe and provide easy access to the spark plug during the replacement process. In addition, you will need to let the engine cool down before starting the process to avoid complications.

Step 2: Locating the Spark Plugs

locating the spark plugs

Once your vehicle is ready, the next step is to locate the spark plugs. The location of this part of your vehicle varies from one model to the other. If you are still not familiar with its location, you may refer to the owner’s manual for guidance.

But usually, the spark plug is located under the ignition coil pack, which is attached to the cylinder head.

Step 3: Removing the Ignition Coil Pack

To access the existing spark plugs, you will need to remove the ignition coil pack, which is located at the top. Since bolts and screws secure the coil pack, you will need to use the socket wrench to remove these bolts to remove them.

But do not drop or lose the bolts to the engine compartment. After removing the bolts, slowly lift the coil pack off the spark plug from the terminal. Once the coil pack is removed, all the spark plugs will be exposed, providing easy access.

Step 4: Removing the Old Spark Plugs

removing the old spark plugs

After you remove the ignition coil pack, it is time to remove the existing spark plug. Use the spark plug socket and extension bar to loosen and remove the spark plugs. The correct way to do it is by turning them counterclockwise.

In addition, do it slowly and avoid too much force to avoid damaging the spark plug or even the cylinder head.

Step 5: Checking the Spark Plug Gap

Another vital step that you need to do before replacing your spark plug is to check the gap. The spark plug gap is the distance between the center and ground electrodes. The gap can affect the spark plug’s performance, so you must check it before the replacement.

You will use a spark plug gap tool to measure the gap on the new spark plug to ensure it matches the specifications needed for your vehicle. You can adjust the gap if required by bending the ground electrode.

Step 6: Anti-seized Compounds and Dielectric Grease Application

Another step you want to do before replacing the spark plug is the application of anti-seized compounds and dielectric grease. But what is essential with this step? Doing this step will prevent your spark plug from getting stuck and allow a smooth removal process.

The anti-seized compounds and dielectric grease will help prevent corrosion while making it easier to remove the spark plugs when needed. On top of that, you can apply a small amount of dielectric grease inside the spark plug electrical boot to improve the electrical connection and protection from moisture and corrosion.

Step 7: Installing New Spark Plugs

installing new spark plugs

One by one, carefully thread over the new spark plugs to each respective cylinder manually. You will need to make sure not to cross-thread them. You can start by turning them clockwise to avoid damaging the threads.

Once they are finger-tight, you can use the spark plug socket and torque wrench to tighten each spark plug to each recommended specification. Do not overtighten or under-tighten. Just follow the recommended torque values.

Step 8: Reinstalling the Ignition Pack and Testing

Once the spark plugs are secured, you can start positioning the ignition coil pack back to its original position. Make sure that it is returned to its original position. Then, secure the coil pack by reinstalling the bolts and screws removed earlier.

You also need to double-check all the connections and ensure they are securely in place. After checking, you can now start the engine to check if it’s running smoothly. Check the engine performance from unusual voices and vibrations.

How Often to Change Spark Plugs Jeep Wrangler

how often to change spark plugs jeep wrangler

Spark plug replacement intervals can vary depending on the make and model of your Jeep. While a standard guideline suggests that changing the spark plug must be done every 30,000 miles, it is still important to refer to your specific vehicle’s owner manual for accurate recommendations.

The vehicle’s manual provides accurate information tailored to your Jeep model. The guide will allow you to determine when and how often to change spark plugs to maintain optimal engine performance. By following the manufacturer’s guidelines, you can ensure the vehicle continues to run smoothly and efficiently.


Learning the Jeep spark plug replacement process is a crucial skill that you can acquire for your Jeep maintenance. Changing your vehicle’s spark plug at the right time is essential in keeping your Jeep’s fuel efficiency and overall performance. It will also help in enhancing the longevity of your vehicle.

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