Apex AMS5374 Fuel Injection Plenum Gasket Set - Upper

Fuel Injection Plenum Gasket Set for Nissan and INFINITI

Apex AMS5374 is a fuel injection plenum gasket set for upper intake service on select Nissan and INFINITI applications. It is built for 1996-2004 vehicles that use an upper plenum sealing setup, including Nissan Frontier, Xterra, Pathfinder, and INFINITI QX4.

Key Features

• Fuel injection plenum gasket set for upper intake sealing
• Fits 1999-2004 Nissan Frontier, upper
• Fits 2000-2004 Nissan Xterra, upper
• Fits 1997-2000 INFINITI QX4, upper
• Fits 1996-2000 Nissan Pathfinder, upper
• Applies to 20 total vehicle fitments across the listed model years
• Part number AMS5374 for catalog and service reference

Detailed Description

The Apex AMS5374 fuel injection plenum gasket set is used to seal the upper intake plenum during service on select Nissan and INFINITI engines. A proper upper plenum seal is important for maintaining intake vacuum integrity and keeping the fuel injection system sealed at the manifold interface. This part number, AMS5374, is listed for Nissan Frontier, Nissan Xterra, Nissan Pathfinder, and INFINITI QX4 applications with upper-position fitment.

Common Issues This Part Can Address

• Upper intake vacuum leaks at the plenum-to-manifold sealing surface
• Rough idle caused by a compromised plenum gasket seal
• Unmetered air entering the intake tract during engine operation
• Service replacement after intake manifold removal
• Sealing wear on older Nissan and INFINITI upper intake assemblies

Installation Notes and Tips

Clean both mating surfaces thoroughly before installation and inspect the intake plenum and manifold for warpage, carbon buildup, or damage. Follow the vehicle service manual for torque sequence and tightening specifications. Verify the upper-position application before ordering, since AMS5374 is listed only for the fitments shown here.

Quality Assurance

Apex AMS5374 is cataloged as a dedicated sealing component for the listed Nissan and INFINITI upper intake applications. Confirm fitment by year, make, model, and upper position before installation.