High Idle why?

[WeekendMechanic]

I have all but one issue the idle reves at 1400rpm iv tried everything   

1 Turned the fuel enrichment screw back out .

2 Vaccum idle lever all the way up.

3 Took off accelerator lever and turned it all the way back.

Nothing is dropping the idle down if I do all of them lowest it goes is to 1200rpm.

[ORCoaster]

Too much pressure on the turbo enrichment pin perhaps?  Pushing it down too much and effectively doing the duty of the idle set screw?

Not sure what else to look at. 

[fatmobile]

Looks like you have the lever on the back of the pump.
 Hooked up to the cold start lever,..
it advances the timing and bumps the idle.

[WeekendMechanic]

Too much pressure on the turbo enrichment pin perhaps?  Pushing it down too much and effectively doing the duty of the idle set screw?

Not sure what else to look at.

Thanks! Forgot to mention that, I tried that, pin is all the way.

Externally there is nothing left to try.

Is there a way to modify the governor to drop the idle inside the LDA housing?

[WeekendMechanic]

Looks like you have the lever on the back of the pump.
 Hooked up to the cold start lever,..
it advances the timing and bumps the idle.

No cold lever im afraid thats the lever for the vaccum idle control its a later aaz pump.

[WeekendMechanic]

I`m hoping someone is familiar with this pump it has some wiring.

A cut off solenoid at the top, a sensor in the middle and another solenoid at the bottom.
Could the high revs have anything to do with these?

[ORCoaster]

I wonder if the sensor is giving the wrong information to where ever it goes.  The solenoid on top is for fuel cut off and I would expect the one below is the high Idle cold start mechanism. 

I would try pulling the wires off the sensor and see what that produces in the way of a result.  It probably gives a resistance change during operation.  So might that be as fuel pressure is increased?  Pull the sensor and clean it up.  Maybe it is got something in it and causing a bad send of information.

Just my ideas, nothing of fact here. 

[WeekendMechanic]

I checked the sensor with vcds lite, its pretty accurate at 1378 rpm.
I tried disconecting the sensor and bottom solenoid.Bottom solenoid,engine stays the same just more engine noise,sensor does nothing unpluged.
Error codes show up, I connect everything up again and clear codes and they dont show up again.

I don`t think its the electronics, I did more research into this and that bottom solenoid is just a timing advance/retard to reduce nox polution controlled by the sensor in the middle and temp sensor which is controlled by an electronic glow plug relay.

Does anyone know a way of a different method to calibrate the idle what about those screws around various places on the pump what do they do?

[WeekendMechanic]

I took it to a shop he took it apart and resolved the issue did not tell me much about what he did.
Oh well at least i`m a happy driver again.

[ORCoaster]

i would think that if you paid him to fix it, he should be willing to tell you what he did.