Fuel - System Service Information/Precautions: Overview
Number: 92-07-6CSection: 6C
Date: SEPT. 1991
Corporate Bulletin No.: 136518R
ASE No.: A1, A8
Subject:
FUEL SYSTEM SERVICE INFORMATION
Model and Year:
1992 CAVALIER, CORSICA AND BERETTA WITH 2.2L ENGINE AND MULTI-POINT FUEL INJECTION SYSTEM
Beginning with the 1992 Model Year, the 2.2L engine has been upgraded to include a Multi-point fuel injection system. This particular fuel injection system is unique to the 2.2L engine within General Motors. The 2.2L engine has integrated the fuel rail that supplies fuel to the fuel injectors with the intake manifold (see Figure 1). The following procedures MUST be followed when servicing the 2.2L engine.
(Note:
1. Before servicing fuel related components, relieve fuel system pressure. 2. When re-installing fuel injectors, verify that only one lower O-Ring is installed and the old O-Ring is not in the lower manifold. 3. Remove the spark plugs and crank the engine after servicing the fuel injectors to verify that the engine is not hydra-locked with fuel from a leaking injector.)
1. Before performing engine noise evaluations, be sure to become familiar with the normal audible noise (ticking) level of the fuel injectors at several engine speeds. The audible noise of the fuel injectors is most prominent when the engine is at idle and the hood is raised. The fuel injectors' contribution to the total engine noise will tend to decrease at higher engine speeds. Once the noise associated with the fuel injectors has become familiar, proceed to investigate any customer comments of engine noise using established procedures. If the noise is diagnosed as fuel injectors then compare the vehicle with other vehicles of the same type. Keep in mind that the total fuel injector noise will vary slightly from car to car, but any large difference may indicate a problem.
2. The 2.2 Liter engine in addition to integrating the fuel rail with the intake manifold has also integrated the air inlet (fitted with a throttle valve), throftle position switch, idle air control valve, throttle cam housing, and vacuum ports in the upper assembly portion of the intake manifold. This eliminated having a separate bolt on throttle body unit. The lower portion of the intake manifold incorporates the fuel rail and allows for the mounting of the fuel injectors and the fuel pressure regulator assembly.
3. The following procedures are to be used when servicing the 2.2L engine.