How do I Change the Spark Plugs on a Subaru Impreza WRX?

Written by william zane
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How do I Change the Spark Plugs on a Subaru Impreza WRX?
(Hemera Technologies/ Images)

The Subaru WRX is a turbocharged, four-wheel drive sedan or wagon that has been immensely popular around the world and in North America. The WRX has roots firmly entrenched in motorsports thanks to the WRX’s success in off road rallying. The racing influence on the WRX has made it a fast, fun to drive streetcar. Part of a WRX’s routine maintenance is the replacement of the spark plugs. This can be done in less than an hour with the right tools.

Skill level:

Things you need

  • Spark plugs
  • Socket set and ractchet
  • Set of socket extensions
  • Plug gapping tool
  • Torque wrench

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  1. 1

    Check the gap on the spark plug with the spark plug gapping tool. The factory setting for the WRX is .028 to .031 inches.

  2. 2

    Disconnect the battery cables from the battery. Loosen the bracket that holds the battery down. Remove the battery for extra clearance.

  3. 3

    Loosen and remove the two fasteners that hold the windshield washer reservoir against the driver’s side shock tower. Unplug the wires that go to the reservoir and move the reservoir to the side. Loosen and remove the two bolts that fasten the air cleaner snorkel to the radiator support. Carefully pull the intake snorkel out of the fender panel.

  4. 4

    Loosen the hose clamps that hold the MAF elbow tubing to the airbox and remove the tubing. Make a note of where the smaller vacuum tubes fasten to the airbox and the MAF elbow tubing.

  5. 5

    Remove the two bolts that fasten the air box to the lower part of the frame. Remove the air box and set it aside.

  6. 6

    Locate the four ignition coils on the passenger side of the engine. Loosen the nut that holds the coils to the engine and pull the coil and spark plug boot off of the spark plugs.

  7. 7

    Loosen and remove the spark plugs with a spark plug socket. Slide the socket over the plug and then turn it counterclockwise. Install the new spark plugs with the spark plug socket and tighten them to 6.8kg/ft with the torque wrench.

  8. 8

    Reinstall the coil and the spark plug boot by sliding the boot over the top of the spark plug. Reinstall the air box onto the frame with the two bolts. Reinstall the MAF elbow tubing to the air box and reconnect any vacuum tubes that were disconnected. Reinstall the intake snorkel in the fender panel. Reinstall the windshield reservoir. Reconnect the battery.

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