D21 Hardbody XE 4WD L4-2389cc 2.4L SOHC MFI (KA24E) (1997)
Swirl Control Valve: Description and Operation
SYSTEM DESCRIPTION
This system has a swirl control valve in the intake passage of each cylinder.
While idling and during low engine speed operation, the swirl control valve closes. Thus the velocity of the air in the intake passage increases,
promoting the vaporization of the fuel and producing a swirl in the combustion chamber.
Because of this operation, this system tends to increase the burning speed of the gas mixture, improve fuel consumption and increase the stability in
running conditions.
Also, except when idling and during low engine speed operation, this system opens the swirl control valve. In this condition, this system tends to
increase power by improving intake efficiency via reduction of intake flow resistance, intake flow.
When engine coolant temperature is below 0°C (32°F) swirl control valve is kept open.