Cadillac 25943867 Pipe Assembly, Intake Manifold Rear Crossover

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In order to remove the intake manifold, one has to first disarm the fuel system and the battery then take off the air intake duct. Next, remove the engine covers; remove the electrical connection to the throttle body, and also remove the electrical connections to the fuel injectors. Also, pulled the electrical connectors and took out the EVAP purge solenoid and MAP sensor, and rest of the wiring harness was placed aside after removing brackets. Unbolt and unbend the fuel rails and injectors this is not mandatory but will prevent damages on the injectors in the process of taking out the intake manifold. Remove any vacuum hoses connected to the intake manifold or throttle body and then loosen the intake manifold mounting bolts in a star-pattern with a 1/4-turn increment until they can then be removed. Slowly raise the intake manifold, ensure that there are no more bolts holding the manifold, do not pry the manifold off the heads as this will cause damage. During installation, it is advisable that the contact surfaces that belong to the cylinder heads and the manifold should be free from other residues of this gasket type, thus, the smell of old gaskets should not be eliminated with the help of a cutter. No debris should be allowed to remain on the surfaces and to achieve this, the surfaces should be wiped with a cloth that is soaked in safety solvent or brake cleaner and in case there is need to chase the threads in the bolt holes with a tap, compressed air should be used to clean the holes. Place the new gaskets on the suitable position on the intake manifold, making they are correctly positioned, and then mount the manifold gently. Use a medium strength thread locking compound on the bolt threads, install the bolts on the block and tighten them with the sequence suggested but do not over tighten in order to prevent gasket leakage. Last of all, the rest of the installation is done this way, and you need to check for lean vacuum after starting the engine at the Intake manifold joints.