GM 24503488 Manifold, Vacuum Source

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First of all, the fuel system pressure should be relieved and the negative battery cable should be disconnected and the cooling system drained. Make sure that the Theftlock audio system lockout is turned 'off' before disconnecting the battery. Second, it is necessary to unbolt and then unplug the throttle body, the hoses labeled 'vacuum' and 'breather' with electric wires followed by the removal of the oil/air separator. Undo the oil fill cap and dipstick, unscrew the oil filler tube and withdrawn from the block, in order to swivel it depending on your access. Go on to take out the intake manifold brace, then, turn the manifold mounting nuts/bolts in small increments of 1/4 turn and then they will be easily taken out. If the manifold is bonded to the cylinder head then free it with a soft face hammer Do Not pry in between the head and manifold because it will damage the gasket surfaces. Cylinder head to manifold flanges must be clean for installation; the use of gasket removal solants may be necessary. Scrape off the whole area free of sealant and all gasket bits, then wipe the area with lacquer thinner or acetone. Tighten the threads in the bolt holes up to the required torque using a tap of the correct size and use compressed air for cleaning purposes. Place the gasket in place on the cylinder head so that the intake port openings, the coolant passage holes and bolt holes suitably align and place the stamped numbers facing the manifold surface. Be very gentle on the gasket when installing the manifold; use hand to thread the nuts/bolts and use the recommended torque sequence to get to the final torque in three steps. Last, perform the other part of the installation in the reverse of the removal sequence, crank up the engine and look for signs of leakage around the manifold gaskets.

If necessary for clearance, remove the power steering pump and tie it aside in an upright position.

Next, remove the TBI cover and air cleaner assembly, then raise the front of the vehicle and support it securely on jackstands while draining the coolant.

The first step is to relieve the fuel system pressure and disconnect the negative battery cable, ensuring the Theftlock audio system's lockout feature is off if applicable.

If installing a new manifold, transfer all fittings and sensors to it.

Install the remaining components in reverse order of removal, change the oil and filter, refill the cooling system, start the engine, and check for leaks.