My car ( 380 000 km) deserved a cleaning of the throttle body and found three holes.

I am wondering if the flap is correctly adjusted in zero position.
Should the hole 1 be above the flap or somehow in between as on the picture?

Can anybody tell what is the procedure for adjusting the flap at idle?

here is the picture.

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Any idea??
I think it can be a source for a bad idle

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I think those are called transition ports so that the air above and below the butterfly valve equalize smoothly and thus when the engine moves off of idle it doesn;t suddenly surge.

Carbs used to have these.

Roguh idle can often be traced to bad wires and air leaks. Have you tried cleaning your idle control valve?

Haasman

__________________
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)

Yes I tried everything mentioned in all the threads on the matter in this forum. thery are in the topic " loss of power while running"

One day I moved the screw that defines the end position of the flap. That is why I need to know the adjustement procedure to bring the flap to the nominal position.

My guess is that the hole @1 has to be above the flap and as I do not have the CD so I expect to get advice from anybody who may know

the picture points the screw I moved and that adjusts the flap.

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Forgot to mention

the hole @1 goes to the thermovalve via vacuum line

the 2 holes @2 are in fact connected on the throttle body and are the same, they go to the regeneration valve via vacuum line on the front left fender.