GM 88969023 Manifold,Intake

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When unplugging the intake manifold, the fuel managing pressure has to be relieved, the cable from the negative terminal of the battery has to be disconnected and the bolt attached to the oil dipstick tube has to be as well. After that, remove the power train/engine cover, disconnect the two clips, and remove the fuel-injection wiring harness. Take off the fuel rail and injectors as one unit, and the throttle body from the intake manifold. Label and remove the vacuum hoses and the PCV connecting from the back of the intake filter manifold and the electrical connectors if any and lastly, take off the two bolts in the alternator bracket. Next, undo the intake manifold nuts and bolts, and the support bracket bolts and then extract the manifold and the gasket from the engine. To install, degrease the mating surfaces of the intake manifold and the cylinder head mounting surface using lacquer thinner or acetone, and if the gaskets are indicative of leaks, then have the manifold examined for warpage and refinished if the case may be. Place a new gasket on the manifold studs and align the manifold over the cylinder head then secure by putting in the nuts, bolts and brackets. The nuts and bolts on the manifold to the cylinder head should be tightened in three or four sequences to the torque as this helps in avoiding warping. Following that, make sure you particularly tighten the manifold-to-cylinder head bolts, the lower bracket bolts. Insert the rest of the parts in the reverse manner they were removed with special attention to the coolant level adding if necessary, and ensure the throttle linkage moves freely before starting the engine. After the engine is running, perform a visual inspection of any leaks such as coolant leak and vacuum leak, followed by a road test to check functionality of all related accessories of the car like cruise control system, if any.