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.
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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
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.
Remove the air filter from its position slowly, trying not to spill much of the dirt that is inside the old filter.
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.
Lower the new air filter into place and align with air intake tube.
Tighten bolts that hold the filter with the intake tube to secure in place.
Lift the front end of the vehicle off of the ground to access the lower part of the engine bay.
Use the recycle container to catch the old oil when it drops from the oil compartment.
Remove the drain plug from the bottom of the oil pan. Let all oil drain from pan before replacing plug back into place.
Unscrew the old oil filter by turning the necessary wrench counter-clockwise until filter can be removed by hand.
Fill the replacement oil filter ¾ full with oil. Hand-screw new filter into place until tight.
Remove the intake manifold and windshield washer to access the spark plugs in the rear of the EZ30 engine.
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.
Remove any faulty plugs from their position by using the necessary wrench size.
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.
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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