Idle revs

Hi guys

i want to change the idle on Elite 2500 using NSP software i am at the Target RPM I change it in there but it does nothing my turner said there is a couple of other places to change the idle but did not tell me where ??? hoping to up the idle

What is the idle control you're trying to change?

If you're trying to lower it, there may be other factors limiting your changes, such as a mechanical idle stop, air leak, or other factor.

trying to raise the idle 100/200 reves

Uh, as in - you're using an electronically controlled throttle, a stepper motor, an air bypass, or other idle control?

If you have a simple throttle stop or solinoid, adjust the closed point and/or try increasing the timing a little around idle and/or play with the fuelling a little?

In the NSP software, add a new page, and select the idle control template.

This screen is brilliant at giving you an idea of what the entire idle control system is doing

Main one to look at, is the idle state. it should show closed loop. If it doesn't, its because the ECU doesn't beleive the engine or car is in a state whereby it should be idling. eg doing 100kmh on the fwy, throttle is applied etc

Make sure on the main idle control page, its actually set to closed loop mode, not open. And make sure the idle control method is right for your car, eg DBW, 2 wire etc. You probably should also check idle control is actually working too, idle control valves can bind up and stick open. If this is happening, usually you changing the target rpm or base closed loop fuel table (what actually controls fueling under idling) should result in the wideband show it getting leaner or richer, but the rpm won't change. If your idle control valve has a position sensor, which many do, you can also log the idle output vs position and see if the position is even changing.

Also, check if the vehicle speed check is enabled, and if it is, don't set it to 0 as small fluctuations in the speed sensor input can disable closed loop idle control. By default its usually like 20km/h, but isn't necessary this is even on.

Now if that all checks out, and its in closed loop, but its still not dropping you need to find out why closed loop can't get there. Because keep in mind, if you say to the Haltech, idle 200rpm higher the way it does that is by changing fueling and the amount of air (idle control valve, solenoid or DBW), but it has limits on how much play it has.

If your using DBW idle control on the main idle control page there is a max dbw position. By default i think this is 10%, but if its been changed, the ECU might not be allowed to open the throttle any further, so can't increase rpm's

Likewise if your using a stepper motor, you need to know how many steps the stepper motor can step. If that is set to low, then the motor will never fully open the idle control valve