How to Replace the Spark Plugs on Chrysler Cars

by Contributing Writer; Updated June 12, 2017

Routine maintenance and tune-ups are a very important part of keeping your Chrysler car. An Chrysler car that is neglected can experience rough idling, higher output of pollution and problems that could damage its performance. Setting a schedule to replace your spark plugs at regular intervals is a good way to keep your Chrysler car lasting longer and being dependable when you need it most.

Under The Hood:

 How to Replace the Spark Plugs on a PT Cruiser


Disconnect the car's negative battery cable.

Remove the engine cover off of its ball studs and lift it off of the engine compartment.

Remove the upper intake manifold to reach the spark plugs.

Unplug one spark plug wire--grasp it by the boot and use a twisting motion to detach it--and withdraw that wire from the valve cover.

Blow away any dirt or other contaminants from the spark-plug hole using compressed air.

Unscrew and remove the spark plug using a ratchet and spark-plug socket, turning in a counterclockwise direction.


Coat the threads of the replacement spark plug with anti-seize compound; don't touch the electrodes or porcelain with the compound. The compound container should have a brush connected to the lid.

Stick a piece of rubber tubing over the end of the spark plug and use it to thread the plug into the hole. If the hose begins to slip, the spark plug is cross-threading; remove it and try again.

Connect the spark-plug wire to the plug using the same twisting motion you used to remove it and the connect the wire's other end back onto the ignition coil pack.

Reinstall the upper intake manifold once you have replaced all the necessary spark plugs.

Connect the engine cover.

Items you will need

  • Ratchet wrench

  • Spark-plug socket

  • Anti-seize compound

  • Rubber hose

 How to Change Spark Plugs in a Chrysler 300 3.5

Use your ratchet to remove the hex screws that secure the engine cover in place. Pull the cover off the engine.

Disconnect the electrical connector from the passenger side plug set. You will find these on the passenger side of the engine block. Turn the red tab on the connector to the left and push the center clip and then pull off the connector.

Pull off the secondary boot wire. This is connected to the second spark plug. Use the ratchet and socket set to remove the 10mm bolts that are securing the coil pack to the vehicle's engine. Remove the coil pack.

Use a spark plug ratchet to remove the spark plugs. Turn the plugs to the left to remove them. Use the spark plug ratchet to install the new plugs.

Put the coil pack back in place and secure it with the ratchet and bolts. Reconnect the secondary boot wire to the coil pack. Connect the electrical connector to the coil plug set. Repeat steps 1-5 for the other side of the engine.

Items you will need

  • One of the most critical aspects of proper vehicle maintenance is regularly changing out the spark plugs from your Chrysler 300. This vehicle's engine has 16 different spark plugs. Most vehicles only have 4 to 8 spark plugs depending on the make and model. You can avoid having a mechanic change your plugs by opting to change them out yourself. The task is fairly simple, but it does require a large investment of time.

 How to Replace Spark Plugs on a 2005 Dodge 4.7 V-8

Check the gap on all eight new Mopar RC12MCC4 -- or equivalent -- spark plugs, using a spark plug gap tool. The Dodge 4.7-liter engine requires a spark plug gap of 0.038 to 0.042 inches. Exchange any incorrectly gapped plugs with new ones, as they are not adjustable.

Loosen the clamp securing the air intake hose to the throttle body -- on the Ram 1500 only -- with a Phillips screwdriver. Pull the hose off the throttle body and position it aside.

Locate the eight coil packs on the top of the engine, just above the valve covers.

Unplug the coil pack wiring harness, by pressing the locking button on the harness and pulling the harness from the coil pack. Remove the bolt securing the coil pack to the engine, using a ratchet and socket. Pull the coil pack upward with a slight twisting motion to remove it.

Remove the spark plug, using a ratchet, 6-inch extension and a spark plug socket. Pull the spark plug from the spark plug socket.

Press a new spark plug into the spark plug socket until the rubber insert inside the socket secures the spark plug. Hand-tighten the spark plug into the engine, using the spark plug socket and 6-inch extension.

Tighten the spark plug to 20 foot-pounds, using a torque wrench, 6-inch extension and spark plug socket.

Coat the inside of the coil pack's rubber boot with dielectric grease. Set the ignition coil back on the spark plug and press it down until it clicks into place. Tighten the coil pack-retaining bolt to 5 to 6 foot-pounds, using a torque wrench and socket.

Repeat Steps 3 through 8 to replace the remaining seven spark plugs.

Reinstall the air intake hose on the throttle body -- Dodge Ram 1500 only. Tighten the air intake hose clamp with a Phillips screwdriver.

Items you will need

  • 8 new Mopar RC12MCC4, or equivalent, spark plugs

  • Spark plug gap tool

  • Phillips screwdriver

  • Ratchet

  • Socket set

  • 6-inch extension

  • Spark plug socket

  • Torque wrench

  • Dielectric grease

 How to Replace Spark Plugs on a 3.5 Litre Chrysler Engine

Locate the spark plug coils on the top of the engine block. There should be 3 on each side. Carefully remove the wire connectors to each coil by removing the screws holding them in place. Once the fasteners have been removed, take out the coils, but remember which plug each coil went to.

Locate the spark plugs by looking down the ports where you removed the spark plug coils. Remove rubber boot from spark plugs by turning 1/2 turn and pulling up. Use a spark plug wrench to remove plugs, but be careful not to snap the plugs by applying to much pressure.

Set the spark plug gap on the new plugs. Refer to the 3.5 litre Chrysler engine owners manual for specific settings. Once the gaps have been set, install spark plugs in engine block. Do not over tighten, just set them snugly into place. Reset the spark plug boots on top of the plugs.

Reattach spark plug coils with set screws. Attach the wire connectors back to the coils and check to make sure you haven't missed anything.

Items you will need

  • Spark plugs for 3.5 litre Chrysler engine Spark plug wrench Spark plug gapper Socket wrench set Screwdriver WD-40

 How do I Replace Spark Plugs in a Chrysler Sebring 2.4 DOHC Engine?

Open the hood for access to the engine compartment. Locate the four wires that are plugged into the front of the engine. The four wires will be evenly spaced.

Pull the first spark plug wire gently away from the engine. This will expose the end of the spark plug.

Place a 5/8-inch deep well socket over the sparkplug. Attach a socket wrench to the socket and loosen the spark plug from the engine by turning the wrench counterclockwise.

Pull the wrench, socket and sparkplug from the engine. The sparkplug will stick inside of the socket.

Pull the sparkplug out of the socket. Discard the old sparkplug.

Tighten the new sparkplug in to the cylinder by hand. Wrench tighten the spark plug with a socket wrench until the wrench can no longer turn.

Push the spark plug wire on to the spark plug. Push the wire on until it locks in place with a "click" sound.

Repeat this process to replace the remaining three spark plugs on the front of the engine. Replace spark plugs one at a time to avoid confusion on placement of the spark plug wires.

Items you will need

  • Spark plug socket (5/8' deep well)

  • Socket wrench

  • Socket set

  • 4 spark plugs

 How to Replace Spark Plugs in a Chrysler Sebring

Disconnect the negative battery cable. On a Sebring convertible, disconnect the remote negative battery cable at the left strut tower. Allow the engine to cool completely.

Locate the spark plug wires that run across the top of the engine. On a Sebring engine, the spark plug wire boots connect directly to the engine block. Grab the wires by the boot and turn them 180 degrees in either direction to unlock the spark plug. Pull up on the wires to remove them.

Slide the spark plug socket, extension and wrench into the cylinder well. Turn the wrench to the left to unscrew and remove the spark plug. If the spark plug is hard to turn, spray penetrating spray into the well to loosen the spark plug.

Apply a thin coat of silicon dielectric compound onto the threads of the new spark plug and on the wire boot.

Screw the new spark plug into place manually with the socket and extension.

Use the tension tester tool to make sure the spark plug has a tension of 20 foot pounds. Loosen or tighten the spark plug until this tension is reached.

Reattach the spark plug wires. Turn them to the left to lock the wires into place. Replace the battery cable to the battery.

Items you will need

  • Spark plug socket

  • Socket wrench with extension

  • Penetrating oil or spray

  • Silicone dielectric compound

  • New spark plug

  • Tension tester tool

 How to Replace the Spark Plugs in a Crossfire

Open the Crossfire's hood and locate the rubber caps connected to the ends of each spark plug. Disconnect the battery and then pull the rubber caps off the spark plugs.

Connect the ratchet extension to the ratchet and connect the spark plug socket to the ratchet extension. Remove all of the spark plugs from the engine, using the ratchet.

Gap all of the new spark plugs using the gaping tool. Gap the new spark plugs to the specification found in the owner's manual for your specific Crossfire model.

Insert the tip of one of the spark plug into the spark plug socket. Insert the new spark plug into the spark plug housing and tighten the spark plug. Repeat this process for all of the other remaining spark plugs.

Tighten all six spark plugs, using the torque wrench. Tighten the spark plugs to the torque specifications for your specific Crossfire model. Replace the rubber caps to the spark plugs, reconnect the battery and close the hood of the car.

Items you will need

  • Ratchet

  • Ratchet extension

  • Spark plug socket

  • Spark plug gaping tool

  • 6 New spark plugs (model specific)

  • Torque wrench

  • Owners manual

About the Author

This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Runs, contact us.