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Once the manifold is deemed re-usable or replaced as needed, the new gasket is applied, the manifold is put in position and the mounting bolts are torqued with a calibrated torque wrench in the OEM specified sequence.Plastic manifolds are checked for cracks, heat damage, and warpage. If the surface of a manifold is not flat, the new gasket will not seal properly. Aluminum and plastic manifolds are checked with a machinist’s straightedge to ensure the surface flatness does not exceed the original equipment manufacturer’s specification.
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Once all connections to the manifold are clear, the manifold is unbolted and removed from the engine.If the fuel rail is bolted to the intake manifold, the supply and return connections to the fuel rail are disconnected.If the car has an upper plenum, that is removed and set aside. Ignition components, such as the coil, are removed as needed. All electrical connections and emission and vacuum lines in the way of the intake are removed. The accelerator cable assembly and cruise control cable are removed and set aside.If the intake manifold has internal cooling system passageways, the engine coolant is drained below the level of those passageways. Working on a cold engine, the engine cover is removed.How do mechanics replace the intake manifold gasket?
Manifold car code#
However, as a leak persists, it may grow larger and it possible for the leak to degrade engine performance enough that it will cause a trouble code to set, which will cause the check engine light to illuminate. Minor leaks at the intake manifold gasket will not usually cause the check engine light to illuminate. Vacuum air leaks into the manifold due to a defective gasket that will upset the air-fuel ratio.