EGR opens at cold idle

[alynxs]

Hello. I have a ford focus 2, 2007 year, 1.6 TDCi 90cp. In morning,  i can see with forscan that my egr is openning at cold idle, after i start the car. Egrvp varies between 50-70%, causing a very rough idle. When i stop the car i can see egr moves between 0 and 100% and then remains on 0 after few cycles. Egr has been cleaned and calibrated with forscan. Egr is a valeo one.

I tried with another egr from a local service and it happens the same. My ecu commands the egr to open after i start the car even engine is very cold. The start, the running of car is pretty good, except the rough idle at cold. No dtcs errors.

What it can be?

[alynxs]

No one any opinion on this?

[TomsFocus]

Honestly, I think it's normal to be slightly open at cold idle but can't seem to find EGR logs from my old one to confirm.  

Although it feels a bit rough it helps reduce emissions and reuce coolant warm up times due to the EGR cooler.   It's self testing fine after shut off as you say it moves between 0 to 100% a couple of times.  The EGR mapping on these doesn't take driveability into consideration, the horrible pull away 'dip' on them is caused by the poor EGR mapping as well.

[alynxs]

I have rough idle sometimes at cold and i can`t figure why it is happening. Injectors are fine.

[TomsFocus]

5 minutes ago, alynxs said:

I have rough idle sometimes at cold and i can`t figure why it is happening. Injectors are fine.

Are the glowplugs ok?  They're used for several minutes after startup on these, you can watch them cycle on & off through Forscan live data same as the EGR.

A rough idle isn't unusual on these though, unless it's really bad and shaking the car or smoking a lot I really wouldn't worry about it.

[alynxs]

Glowplugs are fine, replaced all four 2 weeks ago with Bosch new ones.

Yes, that's it, the rough idle shakes the car a little on cold, but i have no smoke, at idle and at running there is no smoke. At start there is little white smoke, but very little, for about 1-2 seconds after start-up.

And by rough idle at cold i mean at 10 degrees, not very cold.

These values are at 40 degrees engine temperature, but car runs fine at that temperature.

[alynxs]

No one?