Tryied a lot of things to solve unstable Idle on my car. before changing ICV and Air mass flow meter, I have two question for experienced techs.

Question N°1
Could anybody tell me what the screw on the Idle Control Valve (below the seal) is meant for? What does it adjust ?
I believe it may adjust the minimum opening of the Idle control valve but I am not sure.

Question N°2
There are two pins one can see on the upper face of the Mass Flow meter close to the Fuel Dostributor. Any body knows what they are for I would like to avoid to open just for seeing.
( I do not have yet the picture but will be added soon)

Attached Thumbnails

 

Any idea on these topics?

Unfortunately I do not have any old ICV to try

Here is the picture for the second question

Don't know either answer. But, erratic idle is not likely to be solved by adjusting a screw on the ICV. You could remove the ICV and check if the action seems smooth - clean it if it's not. Another thing to check would be the condition of the potentiometer on the side of the airflow meter - they wear out causing this idle problem. Make sure you score marks first to allow you to re-install it in the original orientation. It rotates to calibrate. A flakey OVP can cause idle problems as well, and stalling.

Steve

__________________
'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7

Thanks Steve

OVP is brabd new.

I cleaned the ICV and the shutter is moving I checked it by applying 12V on it - but smothly I dont know how to do it.

As I did notice that screw I wanted to know its function because I believe that with the time the play around the shutter worns out and allows more air leak (that is my guess).

As I have not any spare and bad ICV for try. I was expecting someone to have any experience or a bad defective ICV and try to move the screw and see if it closes the shutter.

I have not yet adressed the Pot will do one of theses days.
I tryied several time to take out the caps that hide the screw and was not able to remove them.
Do you know how to do it? Do they become brittle with ageeing?
Is there a way to get them off?

any idea about the two pins on the Air mass meter?

Thanks Steve

OVP is brand new.

I cleaned the ICV and the shutter is moving I checked it by applying 12V on it - but smothly I dont know how to do it.

As I did notice that screw I wanted to know its function because I believe that with the time the play around the shutter worns out and allows more air leak (that is my guess) that cannot be compensated by a closure of the ICV.

As I have no spare nor bad ICV for try. I was expecting someone to have any experience or a bad defective ICV and try to move the screw and see if it closes the shutter.

I have not yet adressed the Pot and that will be done one of these days.
I tryied several time to take out the caps that hide the screw and was not able to remove them.
Do you know how to do it? Have yiu any picture of them to see how they gripp.
Do they become brittle with ageeing?
Is there a way to get them off?

any idea about the two pins on the Air mass meter?