OkeyDan
New member
- Joined
- May 29, 2017
- Location
- Netherlands
Ah okay, thanks.
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It should not be that sensitive, and i dont think you should need the duty cycle that high to idle.
Yes, I'm running closed loop too, mine needs more work though. And I must say I wouldn't have thought it was so sensitive. I don't know about your car but in mine having a Idle valve duty cycle of 86% results in about 800 rpm and a duty cycle of 88% results in about 1500 rpm. So it sometimes keeps oscillating between 2 duty cycle steps. Does this sound familiar?
@Homer: I think I have about, 20, 20, 40. And the gain slider at about 350. Not quite sure what a diode would do across the + and - other than flyback suppression, you could elaborate on that? And do you know what your duty cycle is while idling a warm engine? Spark advance idle control, sounds fancy, I don't think MSEXTRA has this functionality.
PWM: Used with PWM type idle control valves, either two wire or three wire types, for best control apply external Schottky diode flyback.
It's just flyback suppression as you mentioned.
Duty cycle on my 5cyl is ~47-48% at 850 rpm and a heat soaked 40C MAT.
It's best to set the reference DC curve to achieve 100 rpm higher than your target idle rpm. When you let off the throttle the idle will settle above the target RPM and then the PID will pull the idle down to the target. Keeps your engine from potentially stalling. Also if you can, add some extra timing in the bins below your idle speed. It'll help when you get sudden load changes at idle.
I'd have thought MS would have that control.
http://vems.hu/vt/help/v3/v3_idle_control_menu.html
For explanation of the PID values.
By the way, the ac doesn't cut off under load.
The problem is that the flaps are vaccum controlled, and it switches to foot and defrost setting when you have boost on the intake, the problem related to that is two small check valves on the vaccum lines that go near the oil dipstick, check them out, pull them apart and check that they only flow on 1 way.
Most likely, they are stuck, I manage to fix mine just by toying with it blowing a bunch of times