joe_peters
NAXJA Forum User
- Location
- Grants Pass, OryGun
The idle should be completely dependent on the IAC. The "base idle screw adjustment" isn't really there for that purpose, it is just commonly referred to that way. A better description would be "keep the steel throttle plate from slamming closed in the alloy throttle body and wearing bad spots in it" screw adjustment.
What happens is somebody thinks the idle is off, and the first thing they do is crank the "base idle screw" in. And then all those who follow aren't aware that the IAC now has to work not only to adjust as real time conditions require, but it is also starting off from a failed premise that the data the PCM/ECU is receiving is correct.
Your idle should be 700-750 rpms, in drive, with the engine and transmission fully warmed up--after about 20 minutes of operation. There is no specification for P or N.
It is the job of the IAC to provide the correct idle.
What happens is somebody thinks the idle is off, and the first thing they do is crank the "base idle screw" in. And then all those who follow aren't aware that the IAC now has to work not only to adjust as real time conditions require, but it is also starting off from a failed premise that the data the PCM/ECU is receiving is correct.
Your idle should be 700-750 rpms, in drive, with the engine and transmission fully warmed up--after about 20 minutes of operation. There is no specification for P or N.
It is the job of the IAC to provide the correct idle.