How To Replace Spark Plugs 03-09 Toyota 4Runner

Difficulty: Intermediate · About 70 min · Toyota 4runner

Replace the spark plugs on a 2003-2009 Toyota 4Runner.

Steps

1. Change the passenger-side spark plugs

   Remove the engine cover's two 10mm nuts, release the air box's two latches and set its cover aside, disconnect the ignition coil's connector and remove its 10mm bolt, pull the coil straight out, remove the spark plug with a 5/8-inch socket, compare it to the new one and verify its gap, seat the new plug in the socket and lower it into the well, thread it in by hand and torque it to about 14 ft-lb, apply dielectric grease to the coil socket and connector, reinsert the coil and its bolt, reconnect the connector, repeat for the remaining passenger-side plugs, then refit the air box cover and its latches.

2. Change the driver-side spark plugs

   Repeat the same removal and installation process, moving hoses out of their retaining brackets to reach the middle plug and removing the support bar's two 12mm bolts to reach the rear plug, then refit the engine cover, seating its rear tabs and tightening its two 10mm bolts.

Check your vehicle’s repair manual for exact specifications and fit.