Cadillac 10070149 Manifold Assembly, Inlet Lower

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Relieve the fuel pressure, then disconnect the negative battery cable from the battery. Caution: On models equipped with the Delco Loc II audio system, make sure the lockout feature is turned off before performing any procedure that requires disconnecting the battery. Remove the TBI cover/air cleaner assembly. Raise the front of the vehicle and support it securely on jackstands. Drain the coolant. Label and disconnect any wires and vacuum hoses that will interfere with manifold removal. Remove the throttle and TV cables and brackets. Remove the TBI assembly and fuel lines. Remove the power steering pump (if equipped) and tie it aside in an upright position. Remove the heater hose and coolant line retaining nut near the bottom of the intake manifold. Remove the mounting nuts from the intake manifold. Separate the intake manifold and gasket from the engine. Scrape all traces of gasket material off the intake manifold and head gasket mating surfaces. Installation is the reverse of removal. Make sure to use a new gasket. Tighten the nuts/bolts in the proper sequence. Add coolant, run the engine, and check for leaks and proper operation.

Precautions include disconnecting and labeling electrical leads, removing components like the EGR solenoid assembly and Idle Load Compensator (ILC), and disconnecting the EGR valve.

Before removing the intake manifold, you should remove the intake manifold brace and loosen the manifold mounting nuts/bolts. If necessary, use a soft-face hammer to dislodge the manifold from the cylinder head.

After removing the above components, the rocker arm covers should be removed, followed by the manifold mounting bolts.

Remove this bolt with GM tool J-24394 or equivalent.

If uncertain, consult a certified dealer or refrigeration specialist to have the system depressurized, and never disconnect the A/C hoses while under pressure.

Proceed to take off the TBI assembly and fuel lines, and if equipped, remove the power steering pump, tying it aside in an upright position.

Next, remove the upper intake manifold assembly.

Ensure the mating surfaces of the cylinder heads, block, and manifold are perfectly clean, using gasket removal solvents as needed.

The next step is to remove the intake manifold brace, then loosen the manifold mounting nuts/bolts in 1/4-turn increments until they can be removed by hand.

Next, remove the plenum and the radiator hose from the thermostat housing, followed by disconnecting the coolant temperature sensor and removing the heater pipe nut at the throttle body.

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.