Purpose, Effective Date, Carburetor & FBC Information

PURPOSE

Beginning with the Effective Production Date below, a new carburetor has been installed on 1987 Precis vehicles to improve driveability. This bulletin describes the differences between the old and new carburetors and gives specifications, part number information and schematic diagrams for the new carburetor. As reference to this bulletin, please attach the red-lettered sticker to Page 310-19 of the 1987 Precis Service Manual.

EFFECTIVE PRODUCTION DATE

Automatic Transmission - May 1, 1987
Manual Transmission - June 1, 1987

FIGURE 1:

CARBURETOR DESCRIPTION

The new air fuel type feedback carburetor (defined as new FBC) is a 2-barrel, downdraft feedback carburetor, like the old type carburetor. The new FBC includes a special design feature for optimum air/fuel mixtures throughout all ranges of engine operation. Fuel metering is accomplished by two solenoid valves (feedback solenoid valve & slow cut solenoid valve - Figure 1 on page 2). By varying the amount of time each solenoid valve is energized during the duty cycle, the air/fuel mixture delivered to the engine can be precisely controlled.

FIGURE 2 - TOP VIEW:

FIGURE 3 - VIEW A:

FIGURE 4 - VIEW B:

FIGURE 5 - VIEW C:

EXTERNAL VIEWS OF NEW FBC Figures 2, 3, 4, and 5 show various views of the new FBC.