2007-2016 Jeep Compass — Spark Plug Replacement

1

Expose the ignition coils

Open the hood of your 2007-2016 Jeep Compass with the 2.4L World engine and let the engine cool completely if it was running. Remove the plastic engine cover by pulling it straight up off its mounting grommets. Completion looks like the valve cover and four ignition coils fully exposed.

2

Disconnect the battery

Disconnect the negative battery cable with a wrench and set it aside so it cannot contact the terminal. This prevents accidental shorts while handling the coil connectors. Completion looks like the negative cable secured away from the battery.

3

Unplug the coil connectors

Press the release tab on each ignition coil electrical connector and unplug all four connectors from the coils on top of the valve cover. Label them if needed, though each connector only reaches its own coil. Completion looks like all four coil connectors unplugged.

4

Remove the ignition coils

Remove the small hold-down bolt (typically 10mm) from each ignition coil and pull the coils straight up out of the plug wells. Set them aside in order on a clean rag. Completion looks like four empty spark plug wells with the coils removed.

5

Clean out the plug wells

Blow compressed air into each spark plug well to clear away dirt and debris that could fall into the cylinder. If you do not have compressed air, use a clean rag wrapped around a screwdriver. Completion looks like each well visibly clean around the plug.

6

Remove the old spark plugs

Fit a 5/8-inch spark plug socket with an extension onto each old plug and turn counterclockwise to remove it. Lift each plug out carefully and inspect it for oil fouling or abnormal wear. Completion looks like all four old plugs removed and the wells empty.

7

Gap and install the new plugs

Check the gap on each new spark plug with a feeler gauge and set it to the specification for the 2.4L (about 0.043 inches). Thread each new plug into its well by hand using just the socket and extension to avoid cross-threading. Completion looks like all four plugs threaded in smoothly by hand.

8

Tighten the plugs and prep the coils

Tighten each spark plug snugly with a ratchet, being careful not to overtighten the aluminum cylinder head threads. A small dab of dielectric grease inside each coil boot helps future removal. Completion looks like all plugs secure with coils ready to reinstall.

9

Reinstall coils and reconnect

Push each ignition coil back onto its plug until it seats fully, reinstall the hold-down bolts, and reconnect the electrical connectors. Reattach the negative battery cable and press the engine cover back onto its grommets. Completion looks like everything reassembled with all connectors clicked in.

10

Start the engine and verify

Start the engine and let it idle, listening for a smooth, even rhythm with no misfire or check-engine light. Take a short drive to confirm normal power and acceleration. Completion looks like a smooth idle with no warning lights illuminated.