[Engine] Annoying hanging revs, pulsating idle in 1.6hdi

[Sol]

The doser (or doseur) is a section sitting between the turbo & intercooler, and the intake manifold. On the M59 and B9 > 2010 (ish) they had butterfly valves in them and coordinate the intake between intercooled air and hot straight from the turbo.

Meant to help warming up.

So many issues I guess, they did away with it so the later 8V Diesel (yep they went back to 8V probably for low end torque) had a fake doser which was a plastic replica with no valves and just pipes the turbo into the intercooler and then out of that into the engine.

If you look at the two corrugated rubber pipes (caterpillar shaped things on the left) they lead to the doser (or fake depending on year) and learned recently you can't swap the valve model for a non valve one without a remap or it throws a warning light.

Looks like this: (the whole bit that has the red circle - ignore the circle, the entire unit is the doser)
   

[Chips'n'gravy]

Very nicely laid out.

I'd love to hear more about the doser swapping. Did you mean you have to remap?

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