OEM 2003 Buick Rendezvous Intake Manifold

2003 Buick Rendezvous Intake Manifold Parts and Q&A

• Q: How to replace the lower intake manifold on 2003 Buick Rendezvous?

  A: To replace the lower Intake Manifold, first make sure the Fuel Injector wiring harness connectors are properly attached to their own fuel injectors to prevent excess emission of the engine and poor performance. Start off by removing the upper Intake Manifold, engine left and right-side valve rocker arm covers. Pull the Fuel Injector wiring harness connectors from the injector harness, noting the wiring harness connectors when masking tape with the cylinder number attached to each. Then, disconnect and remove the Fuel Injector, manifold air pressure (MAP), and ect wiring harness, then detected the fuel feed and return pipe from the Fuel Injector rail and lastly the Fuel Injector rail self. Do not remove the power steering pipes or hoses from the pump. Instead, pull off the Power Steering Pump from the covering at the front engine and leave it out of the way. Remove the heater inlet pipe with heater hose and inlet Radiator Hose from the engine and also thermostat bypass hose from the lower Intake Manifold pipe. Now remove the lower Intake Manifold bolts, and the lower Intake Manifold, loosen the valve rocker arms, and remove the push rods. Remove the lower Intake Manifold gaskets and seals, and clean the surfaces of the gaskets and seals on the cylinder heads, as well as the engine block. Perform a check on the lower Intake Manifold, and in case of replacement remove ect and therapist. For installation, apply a bead of 8 - 12 mm (0.08 - 0.11 inch) rtv sealer gm p/n 12345739 or equivalent to each ridge between the front and rear of the lower Intake Manifold and the engine block and install the lower Intake Manifold gaskets. Reinstall the push rods and fasten the valves rocker arms before reinstalling the lower Intake Manifold. Replace the new lower Intake Manifold bolts, tighten the vertical bolts (the 4 in the middle) at 7 nm (62 lb in,) the diagonal bolts (two on each end) should be tightened to 7 nm (62 lb in,) then tighten vertical bolts to 13 nm (115 lb in,) and blow diagonal bolts to 25 nm (18 lb ft). Connect the thermostat bypass hose to the lower Intake Manifold pipe, connect inlet Radiator Hose from engine to lower Intake Manifold pipe and connect heater inlet pipe and heater hose to lower Intake Manifold pipe. Mount the Power Steering Pump onto the front engine cover, the Fuel Injector rail, and the fuel feed and return pipe onto the Fuel Injector rail. Make sure that the terminals of the Fuel Injector wiring harness to their respective fuel injectors are connected, then install and connect the Fuel Injector, map, and ect wiring harness, and then the wiring harness to the ect sensor. Lastly, replace the engine right and left side valve rocker arm covers and upper Intake Manifold.