Chevrolet 12631023 Intake Manifold

Before the intake manifold can be removed, one has to release the fuel system pressure and join the negative terminal of the battery. Pull down the suspension crossbrace off from the top of the front struts and the covers of the engine. For the 2005 through 2011 models with 2.6L and 3.6L engines first remove the wiring from the MAF sensor as well as the air intake duct, next disconnect the throttle control motor wiring connector as well as the PCV pipe. At the rear of the engine remove the wiring connection from the barometric pressure sensor, fuel injector harness, EVAP purge solenoid and the variable intake manifold control valve motor bolts; manifold brace bolts, the plenum bolts. Remove the plenum from the intake manifold disengaging all the remaining connections and detach the fuel line connected to the rear end of the fuel rail. Take out intake manifold bolts connect to the cylinder heads and lift of the intake manifold from the engine. On 3.0L engines remove brake booster vacuum hose, the PCV valve, the EVAP hose and all electrical connections to the intake manifold before removing the assembly. In 2012 and later models, remove the PCV tube and EVAP hose, the fuel rail shield, and any electrical connectors that you can see before popping up the intake manifold and its gasket. When tightening let the mating faces be clean, when replacing gaskets, eliminate the old gasket material gently and replace with fresh gaskets in the right manner. Then place the manifold in correct position, add the thread locking compound to the bolt and then tighten the bolts in correct pattern and to the torque value. Last but not the least; check the coolant level, engage the engine and look for the vacuum leaks at the joints of the intake manifold.