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Rough Idle on 2016 Cherokee V6 – Time for Spark Plugs?

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Mike T. · rep 0 · May 25, 2:24 AM · 1 replies · solved · Question

Vehicle: 2016 Jeep Cherokee Latitude V6

Hey everyone,

I'm driving a 2016 Jeep Cherokee Latitude with the 3.2L V6 engine, and it's just crossed 70,000 miles. Lately, I've noticed a bit of a rough idle, especially when I'm stopped at a light. It's not terrible, but it feels like it's missing a beat sometimes. I haven't seen any check engine lights yet, but I'm worried it might be leading to a misfire.

Could this be a sign that it's time for new spark plugs? What's the recommended interval for these engines? And for those who've done it, how difficult is it to change the plugs on the 3.2L V6 in the Cherokee? Any tips or tricks would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:24 AM

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ClearTheCode admin answer:

  1. Spark Plug Interval: For the 3.2L Pentastar V6 engine in your 2016 Jeep Cherokee, the recommended spark plug replacement interval is typically around 100,000 miles. However, symptoms like a rough idle, slight hesitation, or reduced fuel economy at 70,000 miles can certainly indicate that the plugs are wearing out prematurely or that another issue is present.

  2. Symptoms and Potential OBD-II Codes: A rough idle and potential misfires are classic signs of worn spark plugs or ignition coils. If the misfire becomes significant enough, your check engine light will illuminate, and you might see codes like:

    • P0300: Random/Multiple Cylinder Misfire Detected
    • P0301-P0306: Cylinder Misfire Detected (where the last digit indicates the cylinder number, e.g., P0301 for Cylinder 1)

  3. DIY Difficulty: Changing spark plugs on the 3.2L V6 in the Cherokee is a moderate DIY task. The front bank of cylinders (cylinders 2, 4, 6) is relatively straightforward. However, the rear bank (cylinders 1, 3, 5) is located under the intake manifold, which needs to be removed to access them. This adds complexity and requires careful attention to detail, including replacing intake manifold gaskets.

  4. Recommended Plugs and Tools:

    • Spark Plugs: Use only OEM-specified iridium spark plugs (e.g., NGK or Champion Iridium, as specified by Mopar). Do not use copper or platinum plugs.
    • Tools: You'll need a spark plug socket (usually 5/8"), various extensions, a torque wrench, a ratchet, dielectric grease for the boots, anti-seize for the plug threads, and new intake manifold gaskets.

  5. When to See a Shop: If you're not comfortable removing the intake manifold, or if you're unsure about diagnosing the exact cause of the rough idle (it could also be fuel injectors, vacuum leaks, or ignition coils), it's best to take your Cherokee to a professional mechanic. They can accurately diagnose the issue and perform the plug replacement and any other necessary repairs efficiently and correctly.

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