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Generous Motors
Generous Motors, Auto Mechanic
Category: Chevy
Satisfied Customers: 323
Experience:  Mechanic for 25 years with experience on Buicks, GM Trucks, etc.
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How to change intake manifold gasket on 2000 chevrolet impala 3.4L

Customer Question

how to change intake manifold gasket on 2000 chevrolet impala 3.4L
Submitted: 10 years ago.
Category: Chevy
Expert:  Generous Motors replied 10 years ago.


HiCustomer Thank you for asking your question on Just Answer.

Intake Manifold

REMOVAL & INSTALLATION

3.1L and 3.4L Engines

These vehicles use a 2-piece intake manifold. Note that these pieces are cast aluminum. Use care when working with light alloy components.

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Relieve the fuel system pressure.
  3. Drain the cooling system.
  4. Remove or disconnect the following:
    • Upper half of the air cleaner
    • Throttle body duct
  5. Drain the cooling system.
  6. Remove or disconnect the following:
    • Exhaust Gas Recirculation (EGR) pipe from exhaust manifold
    • Serpentine belt
    • Brake vacuum pipe at the intake plenum
    • Control cables from the throttle body and intake plenum bracket
    • Power steering lines at the alternator bracket
    • Alternator
    • Spark plug wires from the spark plugs and the intake plenum retainers
    • Ignition assembly
    • Evaporative Emissions (EVAP) canister purge solenoid as an assembly
    • Electrical connectors from the Throttle Position Sensor (TPS), Idle Air Control (IAC), fuel Injectors, Engine Coolant Temperature (ECT) sensor, Manifold Absolute Pressure (MAP) sensor and Camshaft Position (CMP) sensor.
    • Vacuum lines from the vacuum modulator, fuel pressure regulator and Positive Crankcase Ventilation (PCV) valve
    • MAP sensor
    • Upper intake plenum
    • Fuel lines from the fuel rail and fuel line bracket
  7. Install an engine support fixture.
  8. Remove or disconnect the following:
    • Right side engine mount
    • Power steering pump and move it aside without disconnecting the lines
    • Coolant inlet pipe from coolant outlet housing
    • Coolant bypass hose from the water pump and the cylinder head
    • Upper radiator hose at thermostat housing
    • Thermostat housing
    • Both rocker arm covers
    • Lower intake manifold bolts. Be sure the washers on the 4 center bolts are installed in their original locations

    NOTE: When removing the valvetrain components, keep them in order for installation purposes.

     

    • Rocker arm bolts, rocker arms and pushrods
    • Intake manifold and discard the gasket

    To install:

  9. Clean the gasket mating surfaces and the excess RTV sealant from front and rear ridges of engine block.
  10. Place a 3mm bead of RTV, on each ridge, where the front and rear of the intake manifold contact the block.
  11. Install or connect the following:
    • New intake manifold gasket
    • Intake manifold
    • Pushrods, rocker arms and bolts

  12. NOTE: Be sure the pushrods are properly seated in the valve lifters and rocker arms.

     

    • Rocker arm bolts. Torque the bolts to 89 inch lbs. (10 Nm) plus an additional 30 degree turn.

    WARNING
    In order to prevent oil leaks, tighten the vertical bolts before the diagonal bolts.

    NOTE: Refer to Section 1 of this manual for the lower intake manifold torque sequence illustration. The illustration is located after the Torque Specification Chart.

     

    • Lower intake manifold bolts. Apply sealant to the threads of bolts. Torque the bolts to 115 inch lbs. (13 Nm).
    • Both rocker arm covers
    • Thermostat housing
    • Upper radiator hose at thermostat housing
    • Coolant bypass hose to the water pump and the cylinder head
    • Coolant inlet pipe to coolant outlet housing
    • Power steering pump
    • Right side engine mount and remove the engine support fixture
    • Fuel lines to the fuel rail and fuel line bracket
    • Upper intake manifold. Torque the bolts to 18 ft. lbs. (25 Nm).
    • MAP sensor to upper intake manifold
    • Vacuum lines to the vacuum modulator, fuel pressure regulator and PCV valve
    • Electrical connectors to the TPS, IAC, fuel Injectors, ECT sensor, MAP sensor and CMP sensor
    • Ignition assembly and the EVAP canister purge solenoid as an assembly
    • Spark plug wires to the spark plugs and the intake plenum retainers
    • Alternator
    • Power steering lines at the alternator bracket
    • Control cables to the throttle body and intake plenum bracket
    • Brake vacuum pipe at the intake plenum
    • Serpentine belt
    • EGR pipe to exhaust manifold
    • Throttle body duct
    • Upper half of the air cleaner assembly
    • Negative battery cable
  13. Refill the cooling system.

    NOTE: An engine oil and filter change is recommended.

  14. Start the vehicle and check for leaks, repair if necessary.