OEM GMC Sonoma Intake Manifold

GMC Sonoma Intake Manifold Parts and Q&A

• Intake Manifold
  12567679
  Q: How to replace the lower intake manifold on GMC Sonoma?

  A:

  First dis-connect the neg. Battery Cable and the breather tube at air cleaner outlet duct.then remove the air cleaner outlet duct to replace the lower Intake Manifold. Defeat the accelerator cable from the Throttle Body and keep it away from accelerator control cable bracket and followed by defeating the cruise control cable from throttle shaft and accelerator cable as well, if there's one. Remove the vacuum hose at the Intake Manifold if a/c is equipped, the power Brake Booster Vacuum Hose, and drain the cooling system. Disconnect the radiator inlet hose, hose leading to heater, and water pump inlet hose from the Intake Manifold. Cease the electrical connectors for fuel meter body assembly , evap canister purge solenoid valve,mapview sensor (MAP), Ignition Coil, ignition control module (ICM),generator, idle air control ( IAC ) motor, throttle position ( TP ) sensor, a/c compressor cutoff switch, a/c clutch switch, and engine coolant temperature ( ECT ) sensor. Cease the engine wiring harness clips and move the harness away and remove the accelerator cable bracket from the Throttle Body and Intake Manifold whiles keeping the cables connected. The pcv hose assembly must be removed from the Intake Manifold and valve rocker-arm cover, the evap canister purge solenoid valve and the Distributor. Remove the fuel supply and return hoses at the back of the Intake Manifold while avoiding the release of the refrigerant. To get access for left front bolt to the Intake Manifold, remove the Drive Belt, loosen and remove the power steering pump rear bracket nuts, and slide the power steering pump bracket front. Unplug the ect sensor wire connector, if available, and then unbolt the lower Intake Manifold bolts and Intake Manifold assembly, and dispose of the lower Intake Manifold gaskets. Clean the lower Intake Manifold with the cleaning solvent and dry it by compressed air checking on gasket sealing surfaces for damage or restricted cooling passages, cracks or damage to threading bolt holes. If a replacement was needed, use gm 4.0 mm (0.157 inch) patch of adhesive gm p/n 12346141 (Canadian P/N 10953433) or equivalent to the side of the Cylinder Head of the lower Intake Manifold gasket on each side, must be installed while the adhesive is still wet. Mount the lower Intake Manifold gasket on Cylinder Head using the gasket locator pins; apply a 5mm (0.197 inch) bead of adhesive gm p/n 12346141 (Canadian P/N 10953433) to the front and rear top of the engine block with bead running onto each lower Intake Manifold gasket. Mount the lower Intake Manifold on to the engine block and if bolts are re-used use thread lock gm p/n 12345382 (Canadian P/N 10953433) on the bolt heads, then tighten the bolts according to a predetermined sequence in a three-step sequence up to the specified torque values. Mount and loosely install power steering pump mounting bracket and tighten bolts and nuts at 41 nm (30 ft.blbs) and reinstall Drive Belt. Install the supply and return pipes of fuel while ensuring that the engine is at number one cylinder top dead center for fixing the Distributor. Remove the Spark Plug from the number one cylinder, turn Crankshaft to stop on the compression stroke, align the marks of reference, and re-install the Spark Plug and the Distributor. Replace the evap canister purge solenoid valve, pcv hose assembly, accelerator and cruise control cable bracket, tightening the nuts to specified torque values. Mount the engine wiring harness, attach the clips, and attach necessary electrical connectors. Attach the vacuum hose to the power brake booster, vacuum hose to the Intake Manifold if you have an a/c, and reinstall the water pump inlet hose, heater hose, and radiator inlet hose. If the vehicle comes with a cruise control cable, reinstall this particular cable, and then reinstall a cable that controls the accelerator on the Throttle Body making sure it is seated well, and attach the accelerator cable to the control bracket. Lastly, replace the air cleaner outlet duct, reconnect the breather tube, refill the cooling system, and reconnect the negative Battery Cable.