For 1990-2009 cars only
- Remove the manifold absolute pressure (MAP) sensor, if required.
- Disconnect the knock sensor wire harness connector (1) from the fuel rail stop bracket (2).
- Remove the positive crankcase ventilation (PCV) valve pipe from the left rocker cover - LS1.
- Remove the PCV valve pipe strap nut - LS1.
- Remove the PCV valve pipe from the right rocker cover and intake manifold - LS1.
- Remove the PCV valve pipe (1) from the valley cover and intake manifold - LS6.
- Remove the fuel rail bolts.
- Note the location of the fuel rail ground strap (1) on the intake manifold.
- Remove the engine coolant air bleed pipe hose from the throttle body.
- Remove the intake manifold.
- Remove the manifold-to-cylinder head gaskets (1) from the intake manifold.
- Discard the intake manifold gaskets.
Important: The intake manifold, throttle body, fuel injection rail, and fuel injectors may be removed as an assembly. If not servicing the individual components, remove the manifold as a complete assembly.
DO NOT use the intake manifold-to-cylinder head gaskets again.
Caution: The fuel rail stop bracket must be installed onto the engine assembly. The stop bracket serves as a protective shield for the fuel rail in the event of a vehicle frontal crash. If the fuel rail stop bracket is not installed and the vehicle is involved in a frontal crash, fuel could be sprayed possibly causing a fire and personal injury from burns.
Remove the intake manifold bolts (1) and fuel rail stop bracket (2).
The fuel rail ground strap must be installed during assembly.
