Patent ID: 7353812

Claim:
An internal combustion engine, comprising: an intake manifold; a throttle body having a main passage connected with said intake manifold, with said throttle body also having a throttle plate for controlling airflow through said main passage and said intake manifold; a bypass passage having a first portion formed in said throttle body and a second portion formed integrally with said intake manifold; a venturi formed in the second portion of the bypass passage, with said venturi having a vacuum passage extending into a vacuum manifold; and a direct vacuum supply passage extending from the second portion of the bypass passage into said vacuum manifold, wherein said intake manifold and said bypass passage are molded integrally into a first assembly, and said vacuum manifold, said venturi vacuum passage, and said direct vacuum supply passage are molded integrally as a second assembly, with said first assembly and second assembly being joined after molding, and with said engine further comprising a first check valve positioned in a valve chamber formed in the venturi vacuum passage between said venturi and said vacuum manifold, and a second check valve positioned in a valve chamber formed in the direct vacuum supply passage between the second portion of the bypass passage and the vacuum manifold.