Civic Hatchback L4-1488cc 1.5L SOHC (D15A2) 3V Carb (1987)
Altitude Compensator: Description and Operation
Fig. 69 Typical air jet controller
The air jet controller, Fig. 69, is an atmospheric pressure sensing device. It controls the amount of air flow into the slow and main air jets of the
primary carburetor throat, and the slow air jet of the secondary carburetor throat. As outside pressure is reduced by increasing altitude, the bellows
expands to open the valve in the air jet controller, increasing air flow to the jets to maintain optimum air/fuel ratio.