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How to Replace Spark Plugs on a 3.5 Litre Chrysler Engine

by Carl Pruit

Routine maintenance and tune-ups are a very important part of keeping your Chrysler 3.5 litre engine running smoothly. An engine 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 engine lasting longer and being dependable when you need it most.

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.

Tip

  • Use WD-40 to loosen any spark plugs that are stuck.

Items you will need

About the Author

Carl Pruit has been a freelance writer since 2005, specializing in service journalism and travel. His work has appeared on various websites. Born and raised in California, Pruit attended Contra Costa Community College in San Pablo, Calif. and received an associate degree in the administration of justice.

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