Changing spark plugs on your 2015 Jeep Cherokee is one of the best ways to keep your engine running strong. Many drivers avoid this task, thinking it’s too complex.
In reality, with a bit of guidance, you can do it at home in about an hour.
This guide will show you how to change spark plugs step by step, share common mistakes to avoid, and provide tips for a smoother process.
Whether you want to save money or just enjoy learning more about your car, you’ll find everything you need right here.
Why Change Spark Plugs In A 2015 Jeep Cherokee?
Spark plugs ignite the air-fuel mixture in your engine. Over time, they wear out, causing rough idling, poor acceleration, and lower fuel efficiency. Jeep recommends replacing spark plugs every 100,000 miles for the 3.2L V6 engine, but harsh driving or frequent short trips may require earlier changes. Fresh spark plugs can boost your fuel economy by up to 4% and make your Cherokee feel more responsive.
What You’ll Need
Before you start, gather these tools and parts:
- 4 or 6 spark plugs (Check your engine: V6 uses 6, 4-cylinder uses 4)
- Ratchet with extension
- 5/8-inch spark plug socket
- Torque wrench
- Flathead screwdriver (for engine cover)
- Anti-seize compound (optional)
- Dielectric grease (optional)
- Compressed air (for cleaning)
Quality matters. Choose spark plugs recommended by Jeep, such as NGK or Champion. Double-check your engine type to get the right quantity.
Step-by-step: Changing Spark Plugs
1. Prepare Your Jeep
Make sure the engine is cool. Disconnect the negative battery terminal to prevent accidental shocks. Remove the plastic engine cover using your screwdriver.
2. Clean The Area
Use compressed air to blow away dirt around the ignition coils. This prevents debris from falling into the engine when you remove the spark plugs.
3. Remove Ignition Coils
On the V6 engine, you’ll see three coils on each side. Disconnect the electrical connectors by pressing the tab and pulling gently. Unscrew the bolts holding each coil, then pull the coil straight out.
4. Remove Old Spark Plugs
Attach the spark plug socket and extension to your ratchet. Turn counterclockwise to remove each spark plug. Be gentle forcing can damage the threads.
5. Install New Spark Plugs
Check the gap on each new plug with a gauge (most come pre-gapped, but it’s wise to check). Apply a small amount of anti-seize to the threads if desired (some manufacturers advise against it for modern plugs). Thread each plug in by hand first, then tighten with the ratchet until snug. Use a torque wrench to tighten to 13 ft-lbs.
6. Reinstall Ignition Coils
Apply dielectric grease to the inside of each coil boot for better contact. Slide each coil back onto its spark plug, bolt it down, and reconnect the electrical plug.
7. Finish Up
Replace the engine cover and reconnect the battery. Start the engine. It should run smoothly and quietly.
2015 Jeep Cherokee Spark Plug Comparison
Choosing the right spark plugs makes a difference. Here’s a comparison of popular options:
| Brand | Type | Expected Lifespan | Price (each) |
|---|---|---|---|
| NGK | Iridium | 100,000 miles | $9–$12 |
| Champion | Platinum | 80,000 miles | $7–$10 |
| Bosch | Double Platinum | 85,000 miles | $8–$11 |
Common Mistakes And How To Avoid Them
- Over-tightening spark plugs: This can strip threads or break the plug. Always use a torque wrench.
- Mixing up coil positions: Put each coil back in the same place.
- Skipping cleaning: Dirt can fall into the cylinder and cause problems.
- Not checking plug gap: Even “pre-gapped” plugs can be off.
- Forgetting dielectric grease: This helps prevent misfires.
Many beginners forget to label coil connectors. A quick photo with your phone before removal can save confusion later.
Estimated Time And Cost
Most people can change all spark plugs in about 45–75 minutes. Labor at a shop costs $120–$200, but DIY cost is mostly just parts. Here’s a quick breakdown:
| Item | DIY Cost | Shop Cost |
|---|---|---|
| Spark Plugs (6) | $54–$72 | Included |
| Labor | $0 | $120–$200 |
| Total | $54–$72 | $174–$272 |
Signs You Need New Spark Plugs
- Hard starts
- Engine misfires
- Rough idle
- Drop in fuel economy
- Sluggish acceleration
If you notice any of these, it’s probably time for a change. Ignoring spark plug issues can damage your catalytic converter or other engine parts.
Pro Tips For Success
- Always work on a cool engine to avoid burns.
- Keep a magnet handy in case you drop a plug.
- Use only recommended spark plug brands for the 2015 Jeep Cherokee.
- Double-check you reconnect every sensor and wire.
- If you feel unsure, check your owner’s manual or visit the official Mopar Jeep site.
Frequently Asked Questions
How Often Should I Change Spark Plugs In A 2015 Jeep Cherokee?
Jeep recommends every 100,000 miles for the 3. 2L V6, but check them sooner if you notice misfires or poor fuel economy.
Can I Use Any Spark Plug Brand?
No. Use only brands and types that meet OEM specifications for your engine to avoid misfires and engine damage.
What Size Socket Do I Need For Spark Plug Removal?
A 5/8-inch spark plug socket with an extension fits most 2015 Jeep Cherokee engines.
Do I Need To Disconnect The Battery?
Yes, always disconnect the negative battery terminal before working on engine electronics for safety.
Is It Ok To Reuse Old Spark Plugs?
No. Old plugs wear out and can harm performance or damage your engine.
Always install new spark plugs when changing them.
Changing spark plugs in your 2015 Jeep Cherokee is a straightforward job if you follow these steps. With a few tools and careful attention, you’ll help your engine run smoother and save money on repairs.
Take your time, double-check your work, and enjoy the satisfaction of doing it yourself.
