Originally Posted by newfort (Post 1186976)

Hi david2047,

Sorry, don't have insight into the pressure convertor and the noise you are experiencing.

Before you begin to tinker with the EGR valve and/or cooler, I would invest in a scanner (if you don't already have one). I personally use Foxwell NT530 and it has been good so far. This way you can check for any codes to diagnose the actual issue. For all you know the EGR could be perfectly fine and the problem might be somewhere else.

A lot of folks also use ISTA software to diagnose and run specific tests.

Originally Posted by david2047 (Post 1187201)

Hey guys,
I found another problem yesterday
The car use a lot of fuel when it is idling or waiting for traffic light,
basically the fuel consumption decrease 0.1L every 5 second when it's not driving,

but when it's driving the fuel consumption is fine, around 10-11L/100km
Does anyone know what is going on?

Originally Posted by Clavurion (Post 1187203)

If you have quite recently reset the consumption calculation the consumption when vehicle isn't moving changes the figure quite drastically. That is normal and does not indicate the engine is consuming fuel more than normal on idle.

Originally Posted by Clavurion (Post 1187007)

Glow plugs won't change the consumption. That "duck noise" is typical for a failed EGR vacuum solenoid like you already figured out. If you don't have diagnostics check the engine coolant temp on cluster hidden menu. It should be near 90 C. Low running temps can make consumption worse and eventually causes problems with DPF.

Originally Posted by david2047 (Post 1187596)

Hi Clavurion,
A little update, with a 15 mins drive, 60% highway and 40% city, the engine coolant temp keep at around 56 C.
I reckon I should replace the thermostat.
Thanks for the information.

Originally Posted by Clavurion (Post 1187616)

There are three possible causes. Main thermostat, EGR thermostat or auto gearbox heat exchanger. EGR thermostat is easy to replace even without loosing coolant. Gearbox heat exchanger you can rule out by compressing the coolant line from radiator to heat exchanger (Nr.11).

Originally Posted by david2047 (Post 1187636)

Cheers
Can I double check the auto gearbox heat exchanger with you?
is it the first one in this link?
https://www.realoem.com/bmw/enUS/sho...diagId=17_0399
17217553389