OEM 2006 GMC Sierra 1500 Intake Manifold

2006 GMC Sierra 1500 Parts Questions & Experts Answers

• Q: How to replace the lower intake manifold on 2006 GMC Sierra 1500?

  A: Drain the cooling system and evaporative emission (EVAP), remove the fuel pipes/hoses, distributor, and the purge solenoid valve's connector from the evap canister harness to replace the lower Intake Manifold. Secondly, unbolt the heater hose clamp, then disconnect the heater outlet hose from the Intake Manifold and heater inlet hose from the Water Pump. Reposition the hoses, then remove the cruise control cable from the Throttle Body lever and accelerator control cable bracket, also remove the accelerator cable from the Throttle Body lever as well as the accelerator control cable bracket. Remove the electrical connectors for the A/C Compressor clutch and a/c pressure switch, pull of the engine wiring harness clip off the accelerator control cable bracket, and off the bracket nuts. Remove the accelerator control cable bracket still attached to the cables from the Throttle Body and clamp it aside. Make screws for disconnect throttle position (TP) sensor, idle air control (IAC) motor, control port injector module- connectors, engine wiring harness clip bolt- connectors to evap canister purge solenoid valve, manifold absolute pressure (MAP) sensor. Remove the engine wiring harness bracket and ground wire from the rear of the right cylinder head and remove the stud securing the engine wiring harness bracket and set the harness aside. I will remove the inlet hose on the top of the radiator and position the clamps but will not energize the rocker cover PCV Valve Hose before removing it from the valve cover. I will also disconnect the power brake boost vacuum hose. Reposition Water Pump inlet hose clamps and remove Water Pump inlet hose. In order to access the front Intake Manifold bolt, take off the Drive Belt, the power steering (P/S) pump rear bracket nut, take the front nut and bolts off the p/s pump bracket, and leave the A/C Compressor and p/s pump on the bracket. Slide the p/s pump bracket forward to get access to the front Intake Manifold bolt, remove the Intake Manifold - lower bolts, and the Intake Manifold itself, discard the Intake Manifold gaskets. Clean and check the Intake Manifold - lower if required. For installation spread 4.0mm/gm (0.157 inch) patch of adhesive gm p/n 12346141, (Canadian P/N 10953433) or equivalent to the cylinder head side of the Intake Manifold Gasket at each end so that it is installed with adhesive still wet. On the front and rear tops of the engine block, running 13 mm (0.50 inch) up onto each Intake Manifold gaskets, apply a 5 mm (0.197 inch) bead of adhesive before joining the Intake Manifold. For use of old fasteners, apply threadlock gm p/n 12345382, (Canadian P/N 10953489), or equivalent to the threads of the Intake Manifold - lower bolts, then all of the said bolts must be installed and tightened in given particular order: first pass to 3 nm (27 inch lbs.), second pass to 12 nm (106 inch lbs.) and final pass to 15 nm (11 ft. Lbs). Move the p/s pump bracket rearward and bolt and nut for the p/s pump bracket are to be tightened to 41 nm (30 ft. Lbs.), then the Drive Belt may be installed. Replace the Water Pump inlet hose and the placement of the clamps, then the radiator inlet hose to the Thermostat Housing and clamps. Join power Brake Booster Vacuum Hose to the valve cover, and PCV Valve Hose to the rocker cover. Mount the engine wiring harness and bracket, and tighten the engine wiring harness bracket stud to 25 nm (18 ft-lb), and tighten rear bracket nut to evap canister purge solenoid valve to 9 nm (80 inch lb). Reconnect the ground nut and wire on the rear of the right cylinder head, tighten at 16 nm (12 ft. Lbs.), and if any power wire on an engine wiring harness, install the bracket and its nuts, tighten at 12 nm (106 inch lbs.). Connect the evap canister harness to purge solenoid valve and the electrical connectors of evap canister purge solenoid valve, and MAP Sensor, then tp sensor, iac motor and control port injector module, respectively. Install the engine wiring harness clip bolt with a torque of 9 nm (80 inch lbs.), afterwards position the bracket and cables, install the accelerator control cable bracket with the cables going to the Throttle Body and tighten the nuts to a torque of 9 nm (80 inch lbs.). Insert electrical connectors for the A/C Compressor clutch and a/c pressure switch, affix the engine wiring harness clip to the accelerator control cable bracket, and connect the accelerator cable to the accelerator control cable bracket as well as Throttle Body lever. Connect it to the throttle lever that if equipped (cruise control cable to the accelerator control cable bracket). Finally, the placement of heater inlet and outlet hoses, install of heater hose clamp and replacement of fuel pipes/hoses and Distributor before you fill the cooling system.