I'm looking for guidance on the behavior of the Idle Air Screw on a properly functioning D-Jet injected car. All of the descriptions that I've found for adjusting the idle are basically just "turn the screw left to make it idle faster, right to make it slower." There's never any description of how much you need to turn it though.
When working correctly is it highly sensitive and only requires very small adjustments to make noticeable changes to the idle? Some of Andrew's posts ( @adawil2002 ) suggest this is the case. Or is it a pretty gross adjustment that requires a lot of turns before seeing much of a change? The idle screw itself has quite a range of adjustment and a big spring to keep it from moving, which would suggest that it's not too fine of a control.
Small adjustments to the idle air screw on my car have basically no effect. Large adjustments don't seem to do a lot either. This includes turning and turning the screw with very little change in the idle speed to show for it. There is a distinct change in the intake sound when I screw it in and out, but the car seems intent on keeping the idle low. I can screw it way out and the sound of air getting sucked into the intake gets louder and louder, but the idle barely budges. I realize the opening for the idle air passage is small compared to the opening of the throttle butterfly, but when I can hear a significant difference in airflow while turning the idle screw in and out I expect to see more of an effect on the idle than it has.
When working correctly is it highly sensitive and only requires very small adjustments to make noticeable changes to the idle? Some of Andrew's posts ( @adawil2002 ) suggest this is the case. Or is it a pretty gross adjustment that requires a lot of turns before seeing much of a change? The idle screw itself has quite a range of adjustment and a big spring to keep it from moving, which would suggest that it's not too fine of a control.
Small adjustments to the idle air screw on my car have basically no effect. Large adjustments don't seem to do a lot either. This includes turning and turning the screw with very little change in the idle speed to show for it. There is a distinct change in the intake sound when I screw it in and out, but the car seems intent on keeping the idle low. I can screw it way out and the sound of air getting sucked into the intake gets louder and louder, but the idle barely budges. I realize the opening for the idle air passage is small compared to the opening of the throttle butterfly, but when I can hear a significant difference in airflow while turning the idle screw in and out I expect to see more of an effect on the idle than it has.
