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Jeep Wrangler Spark Plugs Replacement Guide
How to change the spark plugs in a 4th generation 2018 to 2023 Jeep Wrangler with the 2.0L turbo I4 engine.

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2020 Wrangler 2.0L I4
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Loosen Counterclockwise
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Remove Second Bolt
This automotive maintenance tutorial was specifically written to assist owners of the "JL" fourth generation (2017, 2018, 2019, 2020, 2021, 2022 & 2023) Jeep Wrangler SUV in checking or changing the spark plugs in the Hurricane GME 2.0 liter turbocharged inline four cylinder engine. (The procedure might be similar for the optional Pentastar 3.6L V6 engine.)

Owners of other Jeep, Dodge and RAM vehicles such as the Grand Cherokee, Compass, Renegade, Gladiator, Cherokee, Grand Wagoneer, Wagoneer, Charger, Challenger, Durango, RAM 1500, Promaster, 2500 and 3500 may also find these DIY instructions to be helpful.

The OEM (original equipment manufacturer) iridium spark plugs part number is NGK ILZKR7G-7G  which is also known as ILZKR7G7G or NGK 90219.

The Stellantis (formerly FCA or Fiat Chrysler Automobiles) OEM spark plug part number is MOPAR 68292346AA.

The tools and other items needed to complete this procedure include a Torx T30 star bit screwdriver, a 10mm socket with a 1/4" drive ratchet, a 5/8" spark plug socket, a set of extension bars, a 3/8" drive ratchet and a tube of dielectric grease.

The first two steps are to open the hood and then locate the black metal bolts at the front edge of the plastic engine cover.

Remove the two bolts by turning them in the counterclockwise direction with a Torx T-30 star bit screwdriver.



 

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Two Torx T30 Bolts
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Lift Front of Engine Cover
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Rear Friction Fasteners

Set the two bolts aside in a safe place.

Gently lift the front edge of the plastic engine cover and detach the rear friction fasteners.

Set the plastic engine cover aside in a safe place.

If you have access to compressed air or a wet/dry shop vacuum, clean off the top of the engine to help prevent from having any debris fall down into the spark plug wells.

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Top of Hurricane Engine
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Four Ignition Coils
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First Ignition Coil
Once the engine cover has been removed, you'll be able to see the four black plastic ignition coils.

To more easily remove the # 2 ignition coil, you may need to detach the rubber hose that partially obstructs it.

Locate the electrical connector on the # 1 ignition coil.

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Slide Out Lock Tab
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Disconnect Power Plug
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Loosen Counterclockwise
Gently slide out the plastic lock tab to unlock the power plug.

Disconnect the power plug from the ignition coil.

Use a 10mm socket with a 1/4" drive ratchet to loosen the single bolt on the top of the ignition coil in the counterclockwise direction.

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Spin Out Bolt By Hand
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10mm Bolt Removed
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Lift Out Ignition Coil
Spin out the bolt the rest of the way by hand to avoid having drop down into the engine bay and become lost.

Set the 10mm bolt aside in a safe place.

Gently rotate the ignition coil back and forth a few times to make it is not stuck or "frozen" to the top of the old spark plug.

Lift out the ignition coil and set it aside in a safe place.

To further reduce the chance of having debris or a foreign object fall down into the cylinders, I recommend only checking or changing one spark plug at a time.

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Ignition Coil Part Number
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Empty Spark Plug Well
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5/8" Spark Plug Socket

If you have a CEL (check engine light) or SES (service engine soon) warning indicator light on your Wrangler's gauge cluster, use an OBDII scanner (also known as an OBD2 scan tool) to check for an ignition coil related DTC (diagnostic trouble codes) such as P0350, P0351, P0352, P0353 and P0354.

Some of the most common symptoms of a failing or faulty ignition coil include misfiring, stalling, reduced fuel economy (lower MPG), backfiring, rough idling, loss of power and the engine won't start.

The OEM part number for the ignition coils is MOPAR 68211953AA.

(Other part numbers listed on the FCA OEM ignition coil included the following: 50050430 E2010017582 40647 KJ27B.)

Attach the 5/8" spark plug socket to a long extension bar and a 3/8" drive ratchet.

Your spark plug socket should be equipped with a rubber insert or a magnet to securely hold the old spark plug in place.

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Loosen Counterclockwise
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Old Spark Plug In Well
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Lift Out Old Spark Plug
Lower the 5/8" socket down into the well and on to the old spark plug.

Carefully loosen the old spark plug by turning it in the counterclockwise direction.

If you have trouble loosening a stuck or stubborn old spark plug, try spraying a very small amount of penetrating oil down into the well.

Allow the penetrating oil to seep down into the threads and loosen any corrosion (rust) for at least 15 minutes.

Once the old spark plug is loose, detach the ratchet from the extension bar and spin it out the rest of the way by hand.

Lift the spark plug out of the well and detach it from the socket.

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Inspect OEM Spark Plug
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Empty Spark Plug Well
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Lower In New Spark Plug

Inspect the old spark plug for any wear or deposits.

If the old plug appears to be burnt or covered in soot or oily sludge, the engine might be burning oil and it should be inspected by a professional mechanic.

If the electrode tip on the old plug appears to be burnt or covered in white ashy powder, the engine may have been subjected to overheating.

You may need to choose a spark plug with a different "heat range" (colder or hotter) for your area's climate or your unique driving conditions.

The OEM (original equipment manufacturer) iridium spark plugs in this 2020 Wrangler with the Hurricane GME 2.0L I4 turbocharged engine were part number NGK ILZKR7G-7G (which are also known as ILZKR7G7G or NGK 90219).

If you have a spark plug gap gauge tool, check the gap on the new spark plugs to make sure they match the specification listed on the box which for the OEM NGK brand plugs should be 0.026" (or 0.66mm).

Push the new spark plug into the socket and lower it down into the well. Try to avoid hitting the electrode tip on the side walls or on the cylinder head.

Spin in the new spark plug a few turns by hand in the clockwise direction to make sure it doesn't become cross threaded.

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Tighten Clockwise
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Apply Dielectric Grease
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Lower In Ignition Coil
Attach the 3/8" drive ratchet to the extension bar and tighten the spark plugs in the clockwise direction until they are snug.

I've never used a torque wrench to tighten spark plugs, but the torque specification in the service manual for tightening the spark plugs in the 2.0L I4 engine is 15 lb-ft.

Most spark plug manufacturers recommend that you do NOT use anti-seize grease since it can easily lead to over tightening.

Try to avoid over tightening the new spark plug to prevent from cracking the ceramic or damaging the aluminum threads.

Apply a small amount of dielectric grease to the opening in the rubber dust boot at the bottom of the ignition coil.

The dielectric grease will help keep out moisture and debris to insure a reliable electrical connection.

Lower the ignition coil down into the spark plug well.

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Spin In 10mm Bolt
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Tighten Bolt Clockwise
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Push On Power Plug
Spin in the 10mm bolt a few turns by hand in the clockwise direction.

Tighten the bolt in the clockwise direction with the 10mm socket and a 1/4" drive ratchet until it is snug.

Try to avoid over tightening the bolt to prevent from cracking the ignition coil housing.

Slide the electrical connector back into place on the ignition coil.

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Slide In Lock Tab
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Spark Plug Replaced
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Lower Rear of Cover
Slide in the lock tab to secure the electrical connector in place.

Line up the two rubber friction fasteners on the rear of the plastic engine cover with their corresponding metal pegs.

Push on the rear of the cover to secure the friction fasteners and lower the front edge.

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Replace Two T-30 Bolts
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Tighten Clockwise
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Engine Cover Secured
Replace the two Torx bolts by turning them in the clockwise direction with the T-30 screwdriver until they are snug.

Be sure to write down the spark plug change in your vehicle's service records.

According to the "Servicing and Maintenance" schedule in the owner's manual the spark plugs in the 2.0L turbocharged I4 engine should be replaced every 60,000 miles (96,000 kilometers) or at least once every six years.

For more, please check out all of my 2018-2023 Jeep Wrangler DIY Maintenance Guides.
 

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