Originally posted by eclipzGST there is still a passage that allows air in. That is how your car can idle when the throttle plate is closed. The BISS screw is what opens and closes this passage.
The BISS is not what opens and closes this passage, the IAC is. Think about it, how could a screw open and close itself? The IAC is a stepper motor that gives/takes signals to the PCM and constantly adjusts itself in %'s. The IAC has a pretty broad control, up to 27% throttle I believe.
91 awd: 60-1, 880's, E-Prom, etc. 93 awd: JDM 6 bolt, K&N, full exhaust, Wally 255, otherwise stock.
R.I.P. the original "Factory Freak" 15.5's with short ram and catback only 1996 RS 5-speed
