How to Tune Up a Subaru Ez30 Engine

Written by matt wooddy
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The Subaru EZ30 engine was introduced in 2000. The six-cylinder motor was first seen in the Japanese-launched Legacy Lancaster wagon, and with a 2999cc displacement, it was only 20mm longer than its four-cylinder cousin. Power output in the Legacy is rated at about 217 horsepower and 96.6kg-ft of torque, while the Australian-released Outback application advertises 206 horsepower and 93.9kg-ft of torque. The EZ30 relies on a dual overhead-camshaft (DOHC) and variable induction design. Maintaining maximum power and air flow requires regular tuning and servicing of this Subaru engine.

Skill level:
Easy

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Things you need

  • Air Filter
  • 5w/30 Synthetic Oil
  • Oil Filter
  • Oil Recycle Container
  • Spark Plugs
  • Spark Plug Wires
  • Wrench Set

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Instructions

  1. 1

    Use the necessary wrench size to loosen the bolts that attach the air filter to the rest of the intake system. Check the filter for dirt and other build-up more often than once a year if the regular driving conditions of the vehicle are harsh.

  2. 2

    Remove the air filter from its position slowly, trying not to spill much of the dirt that is inside the old filter.

  3. 3

    Clean the area around the air intake thoroughly. Because the air intake system is vital to proper air flow throughout the EZ30, maintaining a clean space is imperative to maximising the intake system's function.

  4. 4

    Lower the new air filter into place and align with air intake tube.

  5. 5

    Tighten bolts that hold the filter with the intake tube to secure in place.

  1. 1

    Lift the front end of the vehicle off of the ground to access the lower part of the engine bay.

  2. 2

    Use the recycle container to catch the old oil when it drops from the oil compartment.

  3. 3

    Remove the drain plug from the bottom of the oil pan. Let all oil drain from pan before replacing plug back into place.

  4. 4

    Unscrew the old oil filter by turning the necessary wrench counter-clockwise until filter can be removed by hand.

  5. 5

    Fill the replacement oil filter ¾ full with oil. Hand-screw new filter into place until tight.

  1. 1

    Remove the intake manifold and windshield washer to access the spark plugs in the rear of the EZ30 engine.

  2. 2

    Remove all spark plug wires from the attached plugs by pulling at the base of the wire. Inspect plugs for corrosion, damages, overheating, and other faults.

  3. 3

    Remove any faulty plugs from their position by using the necessary wrench size.

  4. 4

    Install new plugs by hand. Spark plugs are cheap and are not required to be changed often, so replacing is much more effective than trying to repair or clean.

  5. 5

    Replace any frayed or dirty spark plug wires with new wires. Reattach all plug wires to the corresponding spark plugs.

Tips and warnings

  • Disconnect the battery by removing the negative connection before performing engine tuning.
  • Wear gloves for a better grip on the wrench.

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