OEM Chevrolet Avalanche 1500 Intake Manifold

Chevrolet Avalanche 1500 Intake Manifold Parts Questions & Experts Answers

• Intake Manifold
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  Q: How to replace the intake manifold on Chevrolet Avalanche 1500?

  A: To change an Intake Manifold, take off the Throttle Body and Fuel Injectors then disconnect the electrical connectors of manifold absolute pressure (MAP) sensor and Knock Sensor. Disconnect the Knock Sensor harness connector and put the electrical harness momentarily, aside. If the vehicle has vacuum assisted brakes, remove the vacuum brake booster hose from the back of the Intake Manifold and then the positive crankcase ventilation (PCV) hose. Next extract the MAP Sensor and the evaporative emission (EVAP) purge solenoid vent tube which need to be disconnected from the solenoid and vapor pipe respectively. Unfasten the evap purge solenoid bolt , solenoid , and isolator from the Intake Manifold and loosen and remove the Intake Manifold and Intake Manifold gaskets, throwing away the old gaskets. If there is a need for it, clean and check the Intake Manifold. For installation, new Intake Manifold gaskets should be put onto the Intake Manifold and then the manifold installed. Apply 5mm (0.20 in) band of threadlock - gm p/n 12345382 (Canadian P/N 10953489) on to the thread of the Intake Manifold bolts and tighten them in sequence, a first pass of 5 nm (44 inch lbs.), followed by a final pass of 10 nm (89 inch lbs.). Replace the evap purge solenoid, isolator, and bolt, torquing the bolt to 10n.m (89 inch.lb). Connect the evap purge solenoid vent tube to the solenoid and vapor pipe. Use minute amount of clean engine oil to lightly cover the MAP Sensor seal and install the MAP Sensor to the Intake Manifold. Reattach the pcv hose and the vacuum brake booster hose respectively to the back of the Intake Manifold if necessary. Route the electrical harness across the engine linking the Knock Sensor harness as well as hooking up the electrical connectors for the MAP Sensor and Knock Sensor. Last but not the least replace the fuel injectors and Throttle Body.