The repair process starts by taking out the
Throttle Body and
Fuel Injectors before disconnecting the
MAP Sensor and
Knock Sensor electrical connectors. Take the Knock Sensor harness connector off and place the electrical harness to the side. A vehicle with vacuum-assisted brakes requires removal of the vacuum brake booster hose from the Intake Manifold rear before disconnecting the positive crankcase ventilation (PCV) hose. Detaching the MAP Sensor and evaporative emission (EVAP) purge solenoid vent tube starts by removing the tube from its connection with the solenoid and vapor pipe . Yearly maintenance involves cleaning of the Intake Manifold Gasket area using a brush to remove any dirt buildup between the gasket surface and the Intake Manifold wall. After cleaning, apply a thin coating of liquid gasket gm 10066689 (Canadian 10686719) around the opening of the Intake Manifold bolt threads. Install the Intake Manifold first followed by the evap purge solenoid , solenoid , and isolator . Next tighten all Intake Manifold bolts to a torque of 22 foot-pounds. First extract the Intake Manifold gaskets from the system then throw away the previous gaskets. When checking the Intake Manifold it needs cleaning so you should inspect it and then add new Intake Manifold gaskets and replace the Intake Manifold. Apply a 5 mm (0.20 inch) band of threadlock gm p/n 12345382 (Canadian P/N 10953489) to the threads of the Intake Manifold bolts, then tighten the bolts in sequence to 5 nm (44 inch lbs.) for the first pass and 10 nm (89 inch lbs.) for the final pass. Reinstall the evap purge solenoid , isolator , and bolt , tightening the bolt to 10 nm (89 inch lbs.)mount the solenoid for the evap purge system by connecting its vent tube to the solenoid body and vapor pipe. Before mounting the MAP Sensor onto the Intake Manifold apply a thin layer of clean engine oil to its seal. Then connect the MAP Sensor followed by the pcv hose and, if needed, the vacuum brake booster hose. Guide the electrical harness through the engine space before joining the Knock Sensor harness with the MAP Sensor and Knock Sensor wires. Reinstall the fuel injectors together with the Throttle Body unit.