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Buick Master
2,993 Answers
- Posted on Nov 13, 2010
Re: How to remove intake manifold on 2005 Buick Lesabre
You didn't post the size of your engine so please pick the appropriate one:
3.8L
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Relieve the fuel system pressure.
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Drain the cooling system.
- Remove or disconnect the following:
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Negative battery cable
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Supercharger
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Thermostat housing
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Exhaust Gas Recirculation (EGR) tube at the intake manifold
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Engine Control Temperature (ECT) sensor
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Intake manifold
To install:
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Install or connect the following:
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Intake manifold with new gaskets. Torque the bolts, working from the center out, to 11 ft. lbs. (15 Nm).
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ECT sensor connector
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EGR tube to the intake manifold
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Thermostat housing
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Supercharger
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Negative battery cable
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Refill and bleed the cooling system.
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Run the engine and check for leaks and proper engine operation.
4.6L
4.6L Engine
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Remove the brake booster hose from the throttle body.
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Remove the fuel pressure regulator vacuum tube from the fuel pressure regulator and the water crossover.
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Remove the PCV fresh air feed tube from the camshaft cover and the throttle body.
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Remove the PCV dirty air tube from the PCV orifice in the right camshaft cover and from the intake manifold.
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Disconnect the fuel injector electrical connectors from the fuel injectors.
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Remove the fuel injector wiring harness.
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Remove the fuel rail bracket nut from the engine lift bracket.
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Remove the fuel rail studs.
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Lift and remove the fuel rail with injectors.
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Loosen the plenum duct clamp in order to remove the intake manifold.
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Remove the intake manifold bolts.
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Remove the intake manifold.
To install:
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Install the intake manifold, fitting the plenum duct over the intake manifold duct.
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Loosely install the intake manifold bolts.
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Intake manifold torque sequence-4.6L engine
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Tighten the intake manifold bolts in sequence. Tighten the intake manifold bolts to 89 inch lbs. (10 Nm).
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Tighten the plenum duct clamp to the intake manifold. Tighten the plenum duct clamp to 24 inch lbs. (2.75 Nm).
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Inspect the fuel injector O-rings. Ensure the fuel injector O-rings are not missing, misaligned or damaged. Replace the O-rings if necessary.
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Lubricate the intake manifold fuel injector bores with light mineral oil (GM P/N 9981704), clean engine oil, or equivalent.
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Install the fuel rail with fuel injectors as an assembly.
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Install the fuel rail studs. Tighten the fuel rail studs to 80 inch lbs. (9 Nm).
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Install the fuel rail bracket nut to the engine lift bracket. Tighten the fuel rail bracket nut to 89 inch lbs. (10 Nm).
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Install the fuel injector wiring harness.
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Connect the fuel injector electrical connectors to the fuel injectors.
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Install the PCV dirty air tube to the PCV orifice in the right camshaft cover and to the intake manifold.
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Install the PCV fresh air feed tube to the camshaft cover and the water crossover.
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Install the fuel pressure regulator vacuum tube to the fuel pressure regulator and the throttle body.
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Install the brake booster hose to the throttle body.
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