How to Replace the Intake Manifold in a GMC Sierra

Pull the negative cable from the battery. Drain the cooling system (see Warnings) and then remove the carburetor or the throttle body.

Label any wiring, hoses and cables by numbering them to correspond to the connecting point. Disconnect all wiring, hoses and cables that are connected to the intake manifold.

Take the bolt out of the power steering pump and put it aside, but do not disconnect the pump. Disconnect the throttle valve linkage in vehicles with an automatic transmission.

Loosen and remove the manifold bolts. Take the manifold away from the engine a bit to disengage the dowel pins in the head. Lift the manifold from the engine.

Clean the mating surfaces of any gasket material and debris. Transfer all fittings to the new manifold if it is being replaced.

Place the manifold gasket on the head. Install the manifold.

Put the intake manifold bolts in place and finger-tighten them along with the nuts and the EGR rub nut and bolt. Apply GM 1052080 or an equivalent sealer to the lower manifold bolts.

Tighten the manifold bolts in sequence, crisis-crossing the inside four corners and then moving to the outside corners. Torque the bolts first to 24 inch pounds, then 108 inch pounds in a second pass. Finish with a third pass of 11 foot pounds.

Reinstall and reconnect all parts in the reverse order that they were removed. Refill the coolant.

Start the engine. Check for proper operation and any vacuum leaks.