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[doughall]

Hi..
I've spent a few hours reading through various posts, and all have been helpful. I've learnt quite a lot!
Ok, this is what I have.
When the engine is idling, the EML comes on, with a 0400 code. (EGR Flow etc)
Once I move off, (in limp mode I might add) and get some load behind it, the light goes off, and normality resumes..

I have checked all vac pipes. All rubber elbows are ok, and fitted nicely. In checking the vac pipes, I can confirm that there is vacuum..
The EGR is ok, and has been cleaned.. It actuates nicely if i suck on the pipe.
The MAF has been replaced with a new one, just in case.
One thing I cant seem to check if the swirl flaps, but without taking the manifold off, I'm unsure how.

I have disconnected the vac pipe to the EGR to make sure that it's definitely seated when idling, and it still throws up the error..
 
Is there anything else I can try? Would the swirl flaps bring up that error, or do they have their own set of codes?

I have an MOT on Saturday...
Thanks in advance...
Doug.

[Marks DTM Calib]

Dependent on variant, the EGR opening is checked by monitoring of the MAF.

At idle on a diesel, the EGR should be fully open, as load increase and turbo spool up is required it closes.

Your issue may be that the EGR is not opening (if vac based check the EGR actuator for a split diaphragm).

[doughall]

Ta for the quick reply..
There is a pulsing vacuum coming from the EGR actuator..

[Marks DTM Calib]

That's fine but is the EGR actually opening?

As if its not then the ECU would report an error. 

[doughall]

Aside from the suck test with the EGR out, and the pulsing vac that I can feel from the pipe, how can I test this?