GMC 10172785 Manifold, Intake

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First off, disconnect the negative battery cable. For 1994 and 1995 VIN Z models, take out the upper fan shroud, air cleaner assembly, drain the cooling system, and disconnect the radiator as well as heater hoses. Also disassemble the spark plug wires, coil and distributor by unbolting emission relays bracket and remove rear braces from drive belt tensioner, remembering to mark relationship of distributor rotor with respect to other parts before removal. Disconnect the fuel lines at TBI unit; remove accelerator cables, cruise control cables, TV cables from manifold; detach vacuum brake booster pipe; label manifold lines & wires and remove them. Move up EGR hose whilst loosening manifold mounting bolts. Prying front of manifold loose after removing all bolts for that purpose is now allowed. In case of 1996 or later models you will need to start from taking out upper fan shroud then move on to air cleaner assembly followed by draining cooling system plus disconnecting upper hoses from radiator as well as heater. Next unbolt EGR valve and take off ignition coil carefully. Remove small brace between intake manifold & AC compressor then turn engine to TDC for number one piston-prior to removing distributor. Old gasket material must be removed to guarantee clean mating surfaces during re-installation; apply RTV sealant if necessary. Be sure new gaskets are properly aligned when putting in place new intake manifold while sealant is still wet on it. Proceed accordingly tightening recommended sequence's bolts once more when finished reverse remaining steps beginning with starting engine thereafter checking for leaks.

The removal process for both systems includes disconnecting the battery, relieving fuel pressure, and removing related components. For the CSFI system, fuel injectors are checked and replaced if needed.

Apply a thin coat of ATV sealant around the coolant passage holes on the cylinder head side of the new intake manifold gaskets.

Detach the upper radiator hose from the thermostat housing cover and, if present, disconnect the heater fitting in the intake manifold.

You should remove the old gasket and transfer all components still attached to the old manifold to the new one.

Remove the two rear braces from the drive belt tensioner, unbolt the emission relays bracket, and proceed to remove the spark plug wires, coil, and distributor, marking the distributor rotor's relationship before removal. Disconnect the fuel lines at the TBI unit, remove accelerator, cruise control, and TV cables from the manifold, detach the vacuum brake booster pipe, and label and disconnect various lines and wires at the manifold and TBI unit. Move the EGR hose and begin loosening the manifold mounting bolts, followed by prying up the front of the manifold after removing all bolts.

Before accessing the intake manifold, you need to remove the air intake duct assembly, the PCV valve, hose connecting the intake manifold to the valve cover, and, in 1997 and earlier MFI models, the upper intake manifold.