Intake Manifold Gasket

This procedure covers the removal and replacement of the intake manifold gasket on the 2AR-FE 2.5L I4 engine, addressing vacuum leaks, rough idle, and coolant seepage issues.

Warnings

Tools required

Parts

• Intake manifold gasket set × 1 — Use OEM Toyota gasket set
• Throttle body gasket × 1 — Included in manifold gasket set or separate
• PCV valve grommet (if damaged) × 1 — Inspect during removal
• Engine coolant × 1 — Toyota Super Long Life Coolant (Pink)

Fluids

• Toyota Super Long Life Coolant (Pink) — 2 qt

Preparation

1. Ensure engine is completely cool to the touch (minimum 2 hours after last operation)
2. Disconnect negative battery terminal and wait 90 seconds for airbag system to discharge
3. Remove engine cover by pulling upward on all four corners to release clips
4. Place drain pan under radiator and drain approximately 2 quarts of coolant from petcock valve
5. Relieve fuel pressure by removing fuel pump relay (EFI MAIN relay in underhood fuse box) and cranking engine until it stalls

Procedure

1. 1

   Remove Air Intake System
   Disconnect the mass airflow sensor electrical connector. Loosen the clamp securing the intake tube to the throttle body. Remove the air filter housing bolts and lift the entire air intake assembly away from the engine bay. Remove the fresh air duct if it interferes with access.
2. 2

   Disconnect Throttle Body Components
   Disconnect the throttle position sensor and throttle control motor electrical connectors from the throttle body. Remove the four throttle body mounting bolts and carefully separate the throttle body from the intake manifold. Set aside with gasket (inspect gasket for reuse or replacement).
   Torque spec

   Throttle Body Bolts10 Nm (7 lb-ft)
3. 3

   Remove Fuel Rail Assembly
   Using the fuel line disconnect tool, separate the fuel feed line from the fuel rail. Disconnect all four fuel injector electrical connectors. Remove the two fuel rail mounting bolts and carefully lift the fuel rail with injectors attached straight up and out. Plug or cover injector ports in manifold to prevent debris entry.
   ⚠Have shop towels ready to absorb residual fuel from lines and rail. Keep away from ignition sources.
   Torque spec

   Fuel Rail Bolts12 Nm (9 lb-ft)
4. 4

   Disconnect Vacuum Lines and Electrical Connectors
   Disconnect the brake booster vacuum line from the intake manifold. Remove the PCV hose from the valve cover and intake manifold connections. Disconnect the EVAP purge valve line and electrical connector. Disconnect the intake manifold pressure sensor connector. Label each connection with tape for reinstallation reference.
5. 5

   Remove EGR Components (if equipped)
   If your vehicle is equipped with EGR, disconnect the EGR valve electrical connector and coolant hoses. Remove the EGR valve mounting bolts and set valve aside. Some models may have an EGR cooler integrated with the intake manifold requiring coolant line disconnection.
6. 6

   Disconnect Coolant Crossover
   Place drain pan beneath the coolant crossover pipes at the rear of the intake manifold. Loosen hose clamps and disconnect coolant hoses. Remove coolant crossover bolts if present and carefully move coolant pipes out of the way. Additional coolant will drain during this step.
7. 7

   Remove Intake Manifold Support Bracket
   Locate the intake manifold support bracket connecting the manifold to the engine block on the passenger side. Remove the mounting bolts securing the bracket to both the manifold and block. Remove the bracket completely to allow manifold removal.
8. 8

   Remove Intake Manifold
   Remove all intake manifold mounting bolts in reverse of the tightening sequence (outside to center pattern). There are typically 6 bolts securing the manifold. Gently work the manifold loose from the cylinder head, breaking the gasket seal. Lift the manifold straight up and away. Avoid prying against the manifold or head surfaces.
   ⚠The plastic intake manifold can crack if forced. If gasket is stuck, carefully use plastic scraper around edges to break seal.
   Torque spec

   Intake Manifold Bolts25 Nm (18 lb-ft)
9. 9

   Remove Old Gasket and Clean Surfaces
   Remove the old intake manifold gasket from the cylinder head. Use a plastic gasket scraper to carefully clean all gasket material from both the cylinder head mating surface and the intake manifold mating surface. Clean with brake cleaner and lint-free towels. Inspect surfaces for damage, warping, or cracks. Cover intake ports with clean towels to prevent debris entry.
   ⚠Do not use metal scrapers on aluminum surfaces as this can cause scratches and leaks. Use only plastic scrapers and chemical cleaners.
10. 10

    Install New Gasket and Position Manifold
    Remove protective towels from intake ports. Position the new intake manifold gasket on the cylinder head, ensuring all port openings align correctly and locating pins (if present) are seated. Carefully lower the intake manifold onto the gasket, verifying alignment of all bolt holes and that gasket remains properly positioned.
11. 11

    Install and Torque Intake Manifold Bolts
    Hand-thread all six intake manifold mounting bolts to prevent cross-threading. Using a torque wrench, tighten bolts to 25 Nm (18 lb-ft) in the proper sequence: start from the center bolts and work outward in a criss-cross pattern. Make two complete passes to ensure even gasket compression and proper sealing.
    ℹ️Proper tightening sequence is critical to prevent gasket leaks and manifold warping. Always start from center and work outward.
    Torque spec

    Intake Manifold Bolts25 Nm (18 lb-ft)
12. 12

    Reinstall Support Bracket and Coolant Components
    Reinstall the intake manifold support bracket and torque mounting bolts to 47 Nm (35 lb-ft). Reconnect the coolant crossover pipes and tighten coolant crossover bolts to 15 Nm (11 lb-ft) if equipped. Secure coolant hoses with clamps. Reinstall EGR valve (if equipped) with new gasket and torque bolts to 25 Nm (18 lb-ft).
13. 13

    Reinstall Fuel Rail and Throttle Body
    Remove protective covers from injector ports. Install fuel rail with injectors, ensuring all injectors seat properly in their ports. Torque fuel rail bolts to 12 Nm (9 lb-ft). Reconnect all four injector connectors and the fuel feed line (listen for click). Install throttle body with new gasket if needed, torque bolts to 10 Nm (7 lb-ft) in criss-cross pattern.
    Torque spec

    Fuel Rail Bolts12 Nm (9 lb-ft)

    Throttle Body Bolts10 Nm (7 lb-ft)
14. 14

    Reconnect All Lines and Electrical Connections
    Reconnect all vacuum lines including brake booster, PCV, and EVAP purge lines per labels made during disassembly. Reconnect throttle body electrical connectors, manifold pressure sensor, and EGR connectors if equipped. Double-check that all connections are secure and properly seated.
15. 15

    Reinstall Air Intake and Refill Coolant
    Reinstall the air intake assembly and air filter housing, ensuring MAF sensor is connected and intake tube clamp is tight. Refill cooling system with Toyota Super Long Life Coolant (pink) to proper level. Reconnect negative battery terminal. Install engine cover by pressing down on all four corners until clips engage.

Reassembly

1. Verify all electrical connectors are fully seated and locked
2. Ensure all vacuum lines are routed correctly and not kinked or pinched
3. Confirm fuel line is properly connected with audible click
4. Check that no tools or shop towels were left in engine bay

Verification

• Before starting engine, turn ignition to ON position (not START) and listen for fuel pump priming. Check for fuel leaks around fuel rail connections
• Start engine and allow to idle. Check for vacuum leaks by listening for hissing sounds around intake manifold perimeter
• Monitor coolant temperature and check for coolant leaks around crossover pipes and EGR connections as engine warms
• Verify idle is smooth and stable (should be approximately 600-700 RPM when warm)
• Test drive vehicle and confirm throttle response is normal with no hesitation or rough running
• After test drive, recheck all connection points for leaks and verify coolant level is stable

Related trouble codes on this vehicle

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