Official 3.0 Diesel Engine Issues & Comments Thread

[KamilFKH]

Originally Posted by thto

Hi All

I am having some intermittent starting problems with my diesel x5.
Starts on the button every morning rain or shine, or whenever has not run for several hours.

At other times it can be problematic, sometimes taking 5-10 minutes to start after cranking every minute or so.

when driving, it is sweet and no lumpy idling.


I purchased a peake code reader and for those familiar with them, this is what I found.

From 'fc' (fault check mode) press 'go' and reader shows '52' then 'c' then 'ie' then '25' then returns to '--' (which I believe means no more codes found).

I understand this to be a code of ie25.

I cannot find this code anywhere in the accompanying peake booklet, do I need to convert it?

I suspect the starting issue is heat related on a resistor type / sensor item as when cold the car starts like a dream. Only when warm and used several times in the day do I get the problem.

Anyone help?

Thanks

Hi,
The problem with quick finding what is problem is with the codereader fault code interpretation. If You use another tool (e.g. some OBD2 scanner with larger display or PC connected) You would find that the code is not ie25 but 1E25 and then after a short Inet search You would find it means "Überwachung Drehzahlgeber/Cam Shaft position sensor". I had the same issue on my 3.0D car from time I bought it but the problem (car won´t start) occured only when coolant temperature was exactly at the point when the gauge needle left the blue area. At first, without any diagnostic adapter, I thought it´s something to do with immobiliser that does not allow car to be started, but after reading all car´s fault memories I found this fault. About 82€ for the sensor solved the problem.

One more thing concerning to this 1E25 fault. If it is stored in Your DDE 4.0 fault memory, the DDE control unit falls into, let me say, "emergency" mode causing some parts of the engine to be switched off of operation:
-the turbocharger exhaust gas flaps are not operated
-the amount of fuel injected is limited to some value
-swirl flaps in mainfold are not operated and remain closed

and maybe some more restriction, for full list I should search WDS where the description is located. This all causes the engine to perform much worse with lower torque, lower max power, lower dynamic, higher fuel consumption all this causes poor performance of EGS (automatic gearbox control unit) shifting "few hundreds revs" later (e.g. at 4t instead of at 2,5t when trying to overtake etc.) I reckon that the overall performance of my 184HP M57 3.0D engine was limited to value somewhere around 100-120HP so It felt like You have a totally clogged air filter or pulled handbrake.

Do not forget to erase this fault from DDE for sure. I did it and then I thought I have a brand new car . Awesome power, huge torque. Of course I get used to it soon but the first impression from this change was very intense .

Cheers, Kamil