Upper Intake Manifold & CPI Assembly: Installation

1. To install, reverse removal procedure. Align CPI assembly grommet with casting grommet slots and push down on CPI until it is seated in bottom of guide hole. See Fig 1.
2. Push poppet nozzles into casting sockets. Ensure poppet nozzles are firmly seated and locked in casting socket. Install fuel inlet and return lines. Lubricate NEW "O" rings with clean engine oil.
3. Pressurize fuel system and check for fuel leak. Install upper intake manifold assembly. Tighten upper intake manifold bolts and nuts to 90 INCH lbs. (10 N.m) and in sequence. See Fig 2.

Fig 1: Exploded View Of Central Port Injection (CPI) Assembly

Courtesy of GENERAL MOTORS CORP.

Fig 2: CPI Upper Intake Manifold Tightening Sequence

Courtesy of GENERAL MOTORS CORP.