If you want to give your Subaru WRX some love, removing the intake manifold is one of the most challenging tasks you can undertake. However, with proper tools and techniques, it can be done safely and efficiently. In this article, we will guide you through the process step by step, using case studies and personal experiences to illustrate each step.

Before you start, make sure you have all the necessary tools and safety equipment: OBD scanner, torque wrench, drain pan, 14mm socket wrench set, pliers, grease gun, wheel chocks, jack stands, safety glasses, gloves, and hearing protection.

Step 1: Disconnect the Vehicle Battery

Disconnect the vehicle battery to prevent accidental ignition or damage to the system. To do this, locate the negative terminal and remove it with a wrench. Then, use pliers to disconnect the positive wire from the starter motor.

Step 2: Drain the Coolant System

Drain the coolant system before removing the intake manifold. This will prevent damage to the engine if any coolant spills onto it. To do this, locate the drain plug under the engine and use a wrench to remove it. Place a drain pan underneath and let the coolant drain out completely.

Step 3: Remove the Engine Cover

Remove the engine cover to give you access to the intake manifold. Locate the bolts that hold the cover in place and use a wrench to remove them. Then, carefully lift off the cover and set it aside.

Step 4: Disconnect the Vacuum Lines

Disconnect the vacuum lines from the intake manifold using a socket wrench to remove the clamps that hold them in place. Gently pull the lines off the manifold and set them aside.

Step 5: Remove the Intake Manifold

Remove the intake manifold by locating the bolts that hold it in place and using a torque wrench to remove them. Carefully lift off the manifold and set it aside, making sure not to damage any vacuum lines or other components.

Step 6: Replace the Oxygen Sensor

Replace the oxygen sensor to prevent the Check Engine Light from coming on and improve performance. Locate the sensor and use a socket wrench to remove it. Then, insert the new sensor and tighten it in place with a torque wrench.

Step 7: Reinstall the Intake Manifold

Reinstall the intake manifold by carefully aligning it with the engine and bolting it back into place. Make sure not to over-torque the bolts or damage any of the components. Then, replace the vacuum lines and reconnect them to the manifold.

Step 8: Replace the Engine Cover

Replace the engine cover and tighten the bolts that hold it in place. Then, reconnect the positive wire to the starter motor and the negative terminal to the battery.

Step 9: Check for Leaks

Check for any leaks or damage to the coolant system. If you see any leaks, make sure to fix them before driving the car again.