Cold Air Intake Kit for Chevrolet Blazer Pickup (1996-2004) with 4.3L V6 Engine Blue

The Wrench Time

• Estimated Time: 45-60 Minutes
• Difficulty: 3/10 - Basic bolt-on installation requiring minimal mechanical background.

Tools You Will Need

• 10mm deep socket and ratchet (for the battery terminal, airbox bolts, and resonator nut).
• 8mm socket or 5/16" nut driver (for loosening and tightening all hose clamps).
• Flathead screwdriver and panel popper (for releasing plastic push-clips and sensor harnesses).
• T20 Torx bit (if your specific year requires transferring the bare MAF element).
• Pliers (for the factory PCV breather hose spring clamp).

Phase 1: Removing the Factory Part from your 1996-2004 Chevrolet Blazer 4.3L

1. Disconnect the Battery: Always start by disconnecting the negative battery terminal using a 10mm wrench to prevent check engine lights and to reset the ECU fuel trims.
2. Unplug the Sensors: Locate the MAF sensor and the Intake Air Temperature (IAT) sensor on the factory tube. Gently depress the locking tabs with a small flathead screwdriver and pull the plugs free. Tuck the wiring harness safely out of the way so it doesn’t get snagged.
3. Remove the Vortec "Hat" Resonator: Loosen the central wing nut or the 10mm bolt securing the bulky plastic resonator to the throttle body. Use your 8mm socket to loosen the hose clamp connecting it to the main intake tube, and use your pliers to squeeze the clamp and disconnect the PCV breather line. Lift the hat straight up and off the throttle body.
4. Extract the Factory Airbox: Remove the 10mm bolts securing the factory airbox to the core support. Once unbolted, grab the box and pull it firmly upward to pop it free from the factory rubber grommets. Remove the entire stock intake tract from the engine bay.
5. Salvage the MAF Sensor: Using your 8mm socket or T20 Torx (depending on your OEM setup), carefully separate the MAF sensor from the factory plastic housing. Set it aside in a safe, clean location where it won’t be dropped.

Phase 2: Installing the Cold Air Intake Kit for Chevrolet Blazer Pickup (1996-2004) with 4.3L V6 Engine Blue

1. Mount the Heat Shield: Drop the new aftermarket heat shield into the space left by the factory airbox. Secure it strictly to the OEM mounting points using the provided hardware and your 10mm socket.
2. Install the Throttle Body Coupler: Slip the new silicone step-coupler over the bare throttle body. Slide two hose clamps over the coupler, but only tighten the throttle body side down snugly using your 8mm socket. Leave the top clamp loose to allow for adjustment.
3. Transfer the Sensors: Carefully insert your factory MAF sensor into the new setup. If your kit requires transferring the IAT sensor, carefully push it into the provided rubber grommet on the tube. Crucial step: Ensure the directional arrow on the MAF housing points TOWARD the throttle body (indicating airflow direction). Tighten the MAF clamps securely with your 8mm socket.
4. Seat the Blue Intake Tube: Guide the new blue aluminum pipe into the throttle body coupler, then attach the large high-flow cone filter to the end sitting inside the heat shield. Adjust the pipe so it doesn’t rub against the alternator or hood lining, then tighten all remaining hose clamps firmly with your 8mm socket.
5. Reconnect PCV and Wiring: Attach the provided silicone PCV hose from the valve cover breather port to the welded nipple on the new intake tube. Reconnect the MAF and IAT sensor wiring harnesses, ensuring you hear them click firmly into place.
6. Reconnect Battery and Relearn: Reattach the negative battery terminal with your 10mm wrench. Start the engine. Do not touch the gas pedal for at least 20 seconds. The 1996-2004 Chevrolet Blazer 4.3L ECU needs this uninterrupted idle time to calibrate the Idle Air Control (IAC) valve to the new, higher airflow volume.

Disclaimer: This is a general guide provided for the 1996-2004 Chevrolet Blazer 4.3L. Always refer to your factory service manual for exact torque specifications and safety procedures.