GMC 17112896 Manifold Asm,Upper Intake (W/Throttle Body)

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Relieve the fuel pressure and disconnect the negative battery cable from the battery.

Thread the nuts/bolts by hand and then tighten them in three steps.

Before removing the manifold, the plenum, fuel rail, injectors, serpentine drive belt, alternator, power steering pump (if equipped), coolant tubes and hoses, as well as any remaining fuel and vacuum lines and wires, need to be disconnected and removed.

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.

Ensure clean mating surfaces by removing old gasket material and applying RTV sealant as needed. Install new intake manifold gaskets, making sure they align correctly, and set the manifold in place while the sealant is wet. Tighten the manifold bolts in the recommended sequence, then proceed with the remaining installation steps in reverse order, starting the engine and checking for leaks.

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.

The first step is to disconnect the cable from the negative battery terminal to ensure electrical safety.