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Jeep Renegade Spark Plugs Replacement Guide
How to change the spark plugs in a 1st generation 2015 to 2018 Jeep Renegade with the Tigershark 2.4L I4 engine.

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2016 Renegade 2.4L I4
Bolt - Plastic Engine Cover
Loosen Counterclockwise

This automotive maintenance tutorial was specifically written to assist owners of the first generation (2015, 2016, 2017, 2018 and maybe also the 2019 & 2020 model years) Jeep Renegade SUV in checking or changing the engine spark plugs in the TigerShark MultiAir II 2.4 liter inline four cylinder motor.

Owners of other Chrysler, Dodge, Jeep, RAM or Fiat vehicles such as the 200, 300, Pacifica, Town & Country, Avenger, Charger, Challenger, Journey, Dart, Durango, Magnum, Grand Caravan, Fiat 500 500X or 500L, Fiat 124 Spider, Grand Cherokee, Wrangler, Compass, Liberty, Patriot, ProMaster, 1500 and C/V Tradesman minivan may also find these DIY instructions to be helpful.

The OEM iridium tipped spark plugs part number for the 2.4L I4 engine are the Champion REC10WMPB4 (9775).

A few other compatible replacement spark plugs with their part numbers are as follows: Denso (4703) IKH16TT, Autolite XP5325 and MOPAR SP148183AC.

The tools and other items needed to complete this procedure include a 10mm socket with a short extension bar, a 1/4" drive ratchet, a 5/8" spark plug socket, a 6" extension bar with a 3/8" drive ratchet and a tube of dielectric grease.

Single Bolt Removed
Pull Off Plastic Engine Cover
Rubber Friction Fasteners
The first step is to open the hood.

Then locate the single black metal bolt at the left rear corner of the plastic engine cover (on the passenger side).

Remove the bolt by turning it counterclockwise with a 10mm socket with a short extension bar attached to a 1/4" drive ratchet.

Set the bolt aside in a safe place.

The plastic engine cover is still attached by three rubber friction fasteners attached to metal pegs on the top of the motor.

Carefully pull the plastic cover off the top of the engine and set it aside in a safe place.

Four Ignition Coils Exposed
# 1 Ignition Coil Housing
Electrical Connector
If you have access to compressed air or a wet/dry shop vacuum, I recommend thoroughly cleaning off the top of the engine to help prevent from having debris fall down in to the spark plug wells.

I also recommend only checking or changing one spark plug at a time to further reduce the risk of having something fall down in to the cylinder block.

Locate the red locking tab on the first ignition coil's electrical connector.

Slide Out Red Lock Tab
Disconnect Power Plug
Loosen Counterclockwise
Gently slide out the red lock tab.

If you have trouble pulling out the lock tab, use a small flathead screwdriver.

Loosen the single bolt holding the ignition coil to the engine block by turning it counterclockwise with a 10mm socket and a 1/4" drive ratchet.

Remove Bolt
Pull Out Ignition Coil
Spark Plug Well
Set the 10mm bolt aside in a safe place.

Rotate the ignition coil housing back and forth a few times to make sure that the rubber dust boot at the bottom of it is not stuck or "frozen" to the top of the old spark plug.

Gently lift the ignition coil housing out of the spark plug well and set it aside in a safe place.

Loosen Counterclockwise
Spin Out Old Spark Plug
Lift Out Spark Plug
Attach the 5/8" spark plug socket to the 6" extension bar and a 3/8" drive ratchet.

Push the socket down over the top of the old spark plug until it is firmly attached.

Carefully loosen the old spark plug in the counterclockwise direction.

If you have trouble loosening the old spark plug, try to avoid using excessive force to prevent from cracking the ceramic portion of the plug.

You can try spraying in a small amount of penetrating oil such as Liquid Wrench, PB Blaster or Kano Kroil down in to the spark plug well and wait a few minutes. Another method to try is warming up the engine for a few minutes to expand the metal engine block.

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

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


Inspect Old Spark Plug
Lower In New Spark Plug
Spin In Clockwise
Inspect both ends of the old spark plug.

If the electrode end of the old spark plug appears to be ashy white, the plugs might have been exposed to high temperatures such as overheating or they might be the incorrect heat range for your driving conditions or environment.

If the electrode tip of the old spark plug looks grey or is covered in dark black soot, the engine might be burning oil and should be inspected by a professional mechanic.

If you have a spark plug gap gauge, check that the new spark plugs are gapped to the manufacturer's specification listed on the box.

I'd recommend buying the OEM spark plugs which are part number Champion REC10WMPB4 (9775). They are also known as the MOPAR SP148183AC.

Push the new spark plug in to the socket.

Your spark plug socket should have a rubber insert or a magnet to securely hold the new spark plug in place.

Lower the new spark plug in to the well and carefully tighten it by hand in the clockwise direction by just using the extension bar until it makes contact with the cylinder head. Try to avoid cross threading the spark plug.

Tighten Clockwise
Apply Dielectric Grease
Lower In Ignition Coil
Attach the 3/8" drive ratchet to the extension bar and socket. Tighten the new spark plug to just past the point when you feel the new crush washer collapse.

If you are re-installing the old spark plugs, just tighten them a small fraction of a turn past finger tight.

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

Double check that the new spark plug is tight before moving on to the next steps.

Apply a small amount of dielectric grease to the opening on the rubber dust boot at the bottom of the ignition coil. The dielectric grease will help keep out moisture and debris to ensure a reliable electrical connection.

Lower the ignition coil down in to the well and attach it to the top of the new spark plug.

Rotate the ignition coil back and forth a few times to spread around the dielectric grease.

Replace Ignition Coil Bolt
Tighten Clockwise
Push On Power Plug
Spin in the ignition coil bolt a few turns by hand in the clockwise direction to prevent it from becoming cross threaded.

Tighten the bolt by turning it clockwise with the 10mm socket and a 1/4" drive ratchet to just past hand tight.

Try to avoid over tightening the 10mm bolt to prevent from cracking the plastic ignition coil housing.

Push the electrical connector straight on to the base of the ignition coil.

Slide In Red Locking Tab
Red Lock Tab Secured
Push On Plastic Cover
Gently slide in the red lock tab to secure the power plug in place.

Lower the plastic cover over the top of the engine.

Push on the cover to secure the three rubber friction fasteners to the metal pegs on the top of the engine.

Spin In Single Bolt
Tighten Clockwise
Spark Plugs Replaced
Replace the single bolt at the left rear corner of the engine cover by turning it clockwise with a 10mm socket and the 1/4" drive ratchet until it is snug.

Avoid over tightening the bolt to prevent from cracking the plastic engine cover.

Start the engine and listen closely for any strange noises that might indicate a problem such as a disconnected electrical connector or a loose spark plug.

Be sure to record the spark plug change in your SUV's service records.

For more, please check out all of my Jeep Renegade DIY Repair & Maintenance Guides.

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