[southdon1798]

Help!!!

2010 BMW 320D EFFICIENT DYNAMICS

So I’m having intermittent fuel issues that cause the limp mode light to come on and the engine to sometimes cut out. When I then come to a stop and try to start the engine straight away on the button it cranks but doesn’t start. I then push the button again and it starts straight away and drives for a bit then the process repeats. All the while the engine jerks every so often and then cuts out.
I changed the in line fuel filter about 10 days ago and since then no problems until this morning which is when the above started happening again. I’ve got a Carly OBD scanner and have provided pictures of the codes it is throwing up.

For reference I’ve only owned the car a month and the previous owner did not mention these issues but did provide me with paperwork of the previous work it has had done to it. This includes

1 new EGR valve on 30/04/2024 at 78348 miles

1 New inlet manifold and breather hose
1 new Mass Airflow sensor on 05/06/2024 at 78618miles
(These new parts above were supplied and fitted by and independent garage)

And then the car was taken to BMW where the following actions were taken
(20/08/2024 78778 miles)

Clean Inlet manifold ports
1 new EGR valve
ECU reprogramme

Any ideas or suggestions on my next port of call for fixing this car, when it’s right it’s a superb car to drive but I can’t trust it and that kills me inside. Thanks for reading 😊

(Also as another point of reference the car comes with full service history)

[phils2]

Put each code into google and have a good look at a fair few results to see if there's a common theme.

[phils2]

I does seem like an obvious fuel supply issue. If you have live data, try read the fuel pressure and see if it fluctuates.

[gbalthrop]

Originally Posted by southdon1798

... 2010 BMW 320D EFFICIENT DYNAMICS... having intermittent fuel issues that cause the limp mode light to come on and the engine to sometimes cut out. When I then come to a stop and try to start the engine straight away on the button it cranks but doesn’t start. I then push the button again and it starts straight away and drives for a bit then the process repeats... [Codes: 4590, 4630, 4B73 & 483A

First Suspect: an intermittent issue with wiring related to "Rail Pressure Control", between DDE & one of following:
1) Rail Pressure Sensor;
2) Rail Pressure Control Valve;
3) Volume Control Valve.

Throwing parts is NOT suggested, as the components appear to function correctly UNTIL there is an intermittent fault,
probably associated with wiring. You need to determine what further data your Carly can provide in addition to Codes.
Fault Codes are only the starting point for proper diagnosis. "Smart Mechanic" may help. I don't use Carly, so can't help there.

ISTA or INPA will provide the following. You need to determine what the 'Carly-Equivalent' (if any) of these is
(it's in your DDE Fault Memory -- you just need some Tool that can read/display it. If you attach a ScreenPrint
of additional data, we can help:

1) Freeze Frame Data or Fault Details: Snapshot of system conditions at moment fault occurred, such as voltage,
pressure, temperature, mileage/km, whether fault currently present or NOT, etc.

2) Live Data: Real-time display of system conditions, such as:
a) Rail Pressure;
b) Voltage Supply;
c) Other INPUTS from sensors to DDE.

If you can get any of that Data, including ScreenPrints of any FF Data, Live Data, or "Smart Mechanic" Details, please post it. The FF Data should show what happens when fault occurs. Live Data requires "catching fault in act", or seeing what parameter/signal ceases when engine cuts out.

Also, please provide Last-7 Characters of your VIN so we can provide ISTA ScreenPrints showing Electrical Circuits, Connector/Component Locations & other specific test suggestions.

Please also indicate if you have a Multimeter (Minimum Electrical Test Tool). $10 US for multimeter from Amazon:
https://www.amazon.co.uk/s?k=multime...f=nb_sb_noss_1

George