idle control valve . m40 engine.

[arrisbmw]

HI . need some advice please .

something I don,t understand. the icv . does not seem to work on my car when cold it does not increase the idle speed.

Is there a separate module that controls it. ?

I have adjusted the tps , so continuity when throttle closed, then no continuity part throttle followed by continuity when W.O.T, that seems fine.

I,ve swapped with a used icv , no different , the ohm reading on both icv is 8 ohm.

[TurtleDesignTech]

So long as the spring is working in the ICV then it probably works.

All the ECU does it read the TPS for continuity across a certain set of pins, it puts a voltage across the ICV accordingly.

If butterfly in the throttle is closed, the ECU should be reading the TPS as closed (as you have it set up properly). It should simply open the ICV by putting voltage across it and letting air bypass the closed throttle body.

As far as I am aware idle speed itself is controlled by the ECU. Mine is about 900 when cold and settles to about 600 after 45-60 seconds or so.

Only thing I can think of is vacuum leaks or the diaphragm in your Fuel Pressure Regulator has had it.

[Bonymaenjack]

So long as the spring is working in the ICV then it probably works.

All the ECU does it read the TPS for continuity across a certain set of pins, it puts a voltage across the ICV accordingly.

If butterfly in the throttle is closed, the ECU should be reading the TPS as closed (as you have it set up properly). It should simply open the ICV by putting voltage across it and letting air bypass the closed throttle body.

As far as I am aware idle speed itself is controlled by the ECU. Mine is about 900 when cold and settles to about 600 after 45-60 seconds or so.
you mention a spring but is the ICV controlled by a spring or is it free unhindered to move

Only thing I can think of is vacuum leaks or the diaphragm in your Fuel Pressure Regulator has had it.

[arrisbmw]

So long as the spring is working in the ICV then it probably works.

All the ECU does it read the TPS for continuity across a certain set of pins, it puts a voltage across the ICV accordingly.

If butterfly in the throttle is closed, the ECU should be reading the TPS as closed (as you have it set up properly). It should simply open the ICV by putting voltage across it and letting air bypass the closed throttle body.

As far as I am aware idle speed itself is controlled by the ECU. Mine is about 900 when cold and settles to about 600 after 45-60 seconds or so.

Only thing I can think of is vacuum leaks or the diaphragm in your Fuel Pressure Regulator has had it.

thanks for the speedy reply. I wish mine did that 900 down to 600. mine just stays at 600.
thnks your 100 % right .

[arrisbmw]

[quote="Bonymaenjack"][quote="TurtleDesignTech"]So long as e
.
you mention a spring but is the ICV controlled by a spring or is it free unhindered to move


I think its sprung closed , and voltage opens it.

[arrisbmw]

I was wrong before , so corrected my mistake on previous post sorry if confused anyone.
Turkle design was spot on,
still chasing the problem, will updt when i solve it.