Admisión de aire frío para Scion xA/xB (2004-2006) Motor L4 de 1.5L

The Wrench Time

• Estimated Time: 60-90 Minutes
• Difficulty: 3/10 - Basic hand tools, but wrestling the factory resonator out of the 1NZ-FE fender well requires patience and maneuvering.

Tools You Will Need

• 10mm socket and 12mm socket with a 6-inch extension
• 8mm socket or flathead screwdriver for hose clamps
• Panel popper tool for brittle fender liner clips
• JIS #2 screwdriver (or a very snug Phillips #2) for MAF screws
• Needle-nose pliers for factory spring clamps
• Floor jack and lug wrench (highly recommended for wheel well access)

Phase 1: Removing the Factory Part

1. Disconnect the Battery: Always start by disconnecting the negative battery terminal using a 10mm wrench to prevent check engine lights while we swap sensors on your 2004-2006 Scion xA xB 1.5L.
2. Extract the MAF Sensor: Unplug the MAF sensor wiring harness. Using your JIS #2 screwdriver, carefully remove the two screws. Pull the MAF sensor straight up and out. This is the glass jaw of your engine management system—place it somewhere safe where it won’t get dropped or contaminated.
3. Remove the Upper Airbox: Use your pliers to pinch and slide back the spring clamp on the PCV breather hose attached to the intake. Next, use a 10mm socket to loosen the hose clamp at the throttle body. Unclip the airbox lid and pull the entire upper section and paper filter out.
4. Unbolt the Lower Airbox: Remove the three 10mm bolts securing the lower half of the factory airbox to the chassis and lift it out.
5. Evacuate the Fender Resonator: Turn your steering wheel all the way to the right (or remove the driver-side front wheel). Use your panel popper to carefully remove the plastic push-clips holding the front half of the driver-side fender liner. Peel the liner back to reveal the hidden factory resonator. Use a 10mm socket and 12mm socket to remove its mounting bolts, then wriggle the bulky plastic assembly down and out of the vehicle.

Phase 2: Installing the Cold Air Intake for Scion xA/xB (2004-2006) 1.5L L4 Engine

1. Mount the Throttle Body Coupler: Slide the provided silicone step-coupler onto your throttle body. Slide the new worm gear or T-bolt clamps over the coupler, but leave them loose for now.
2. Route the New Piping: Carefully feed the new cold air intake pipe down through the engine bay hole where the factory box sat, routing the lower end into the fender well void. Insert the upper end into the silicone coupler at the throttle body. Line up the pipe’s welded bracket with the factory chassis mounting hole and loosely secure it with a 10mm socket and the provided hardware.
3. Transfer the MAF Sensor: Gently wipe the MAF sensor O-ring to ensure it is clean. Slide it straight down into the new billet MAF housing on your intake pipe. Secure it using the provided aftermarket Allen head screws and a hex key. Snug them down evenly, but do not overtighten and crush the O-ring.
4. Attach the Filter and Hoses: Down in the fender well, push the high-flow cone filter onto the end of the intake pipe and tighten the clamp firmly with an 8mm socket. Back up top, connect the provided PCV breather hose from the engine valve cover to the welded nipple on the new intake pipe.
5. Lock It Down and Relearn: Tighten the throttle body coupler clamps using an 8mm socket and snug down the 10mm bolt on the chassis bracket. Reconnect the MAF sensor harness. Reconnect your negative battery terminal with a 10mm wrench. On the first startup of your 2004-2006 Scion xA xB 1.5L, do not touch the gas pedal for at least 20 seconds. The ECU needs this undisturbed idle time to adjust its fuel trims to the massive increase in cold airflow.

Disclaimer: This is a general guide provided for the 2004-2006 Scion xA xB 1.5L. Always refer to your factory service manual for exact torque specifications and safety procedures.