Cold Air Intake for Nissan Maxima (1995-1999) 3.0L Engine

The Wrench Time: 1995-1999 Nissan Maxima 3.0L

• Estimated Time: 45-60 Minutes
• Difficulty: 3/10 - Straightforward bolt-on for the A32 chassis, though aged factory vacuum lines require a gentle touch.

Tools You Will Need

• 10mm socket and ratchet
• 6-inch socket extension (for the lower airbox bolts)
• 8mm nut driver or flathead screwdriver (for hose clamps)
• Needle-nose pliers (for factory spring clamps)
• Phillips head screwdriver

Phase 1: Removing the Factory 1995-1999 Nissan Maxima 3.0L Intake

1. Disconnect the Battery: Always start by disconnecting the negative battery terminal using a 10mm wrench to prevent check engine lights and reset the ECU fuel trims for the new airflow.
2. Unplug the Sensors: Locate the MAF sensor on the factory airbox of your 1995-1999 Nissan Maxima 3.0L. Press the metal retaining clip and gently pull the harness connector off. If you have a 1998-1999 model with the intake air temp (IAT) sensor mounted in the airbox, unplug it now.
3. Disconnect Breather Hoses: Use your needle-nose pliers to squeeze the factory spring clamps on the valve cover breather hose and the IACV (Idle Air Control Valve) hose connected to the plastic intake resonator. Slide the clamps back and twist the hoses gently to break them free without tearing the aged rubber.
4. Remove the Resonator and Airbox: Loosen the clamp at the throttle body using an 8mm nut driver. Next, use your 10mm socket and 6-inch socket extension to remove the two mounting bolts securing the lower half of the factory airbox to the fender well, and the two 10mm bolts holding the upper resonator bracket. Lift the entire factory intake tract and MAF housing out of the engine bay as one unit.

Phase 2: Installing the Cold Air Intake for Nissan Maxima (1995-1999) 3.0L Engine

1. Transfer the MAF Sensor: On your workbench, use a 10mm socket to unbolt the factory MAF housing from the OEM airbox. Handle it delicately. Bolt the provided aftermarket MAF adapter plate onto the front of your factory MAF housing using the supplied hardware and a 10mm socket. Ensure the gasket or O-ring forms an airtight seal.
2. Mount the Throttle Body Coupler: Slide the new silicone coupler onto the VQ30DE throttle body and secure it loosely with the provided clamp using an 8mm nut driver. Do not fully tighten it yet; you will need wiggle room to clock the pipe.
3. Install the Intake Pipe and MAF Assembly: Slide the new aluminum intake pipe into the throttle body coupler, then attach your MAF sensor assembly to the other end of the pipe using the second silicone coupler. Support the assembly and loosely thread the mounting bracket to the factory chassis mounting point using a 10mm socket.
4. Connect Hoses and Filter: Attach the new breather hoses from the valve cover and IACV ports onto the nipples of the new intake pipe. Place the high-flow cone filter onto the end of the MAF adapter plate and tighten the filter clamp with your 8mm nut driver. If your model uses the push-in IAT sensor, transfer the rubber grommet and push the sensor firmly into the pre-drilled hole on the intake pipe.
5. Final Tightening and First Startup: Adjust the pipe so it clears the master cylinder and hood, then use your 8mm nut driver and 10mm socket to fully tighten all hose clamps and the mounting bracket. Reconnect the MAF sensor harness (listen for the click) and reconnect the negative battery terminal with your 10mm wrench. Start the engine, and remember that on the first startup, the vehicle gas pedal should not be touched for 20 seconds until the ECU adjusts to the increased airflow.

Disclaimer: This is a general guide provided for the 1995-1999 Nissan Maxima 3.0L. Always refer to your factory service manual for exact torque specifications and safety procedures.