[ttsvetanov]

Hello guys. I am trying to deal with some problems on my recently bought E93 N54 2007
When the car is cold (not started for more than 5 to 6 hours) I am having a rough start with check engine light and of course limp mode. By rough start I mean normal crank start, but very bad engine work with loud injectors and RPM between 500 and 1500. After some seconds (maybe 30 I presume) the engine is starting to work normally (650~ RPM) with limp mode. Then if I shut off and start again the engine – everything is working smoothly. I repeat, this only happens on cold start.
Another problem (I think its not related to the first, but I am not sure) is cylinder injection cut when I kickdown. Restarting the engine is fixing the problem.
The error codes I am getting are:
0029DC – cylinder injection cut – the second problem
0029F2 – high-pressure fuel system, fuel pressure – after the rough cold start
I am not sure where could be the problem – the HPFP or some injector failing?
The things I’ve done so far by know:
- 002E8E – intelligent battery sensor, communication
- 002E98 – generator, communication
- 002E85 – electric coolant pump, communication
- 002E83 – electric coolant pump, energy operation
All of the above problems was fixed by changing the voltage regulator for generator.
- 0029F3 – fuel sensor, electric
- 0029F1 – fuel pressure plausibility
- 02AAF – Fuel pump, plausibility
All of the above problems was fixed by changing the low-pressure sensor with the new design of Bosh.
- 0029D0 – Misfiring, cylinder 4
The problem was fixed with changing the injector for cylinder 4 (with brand new index 12_.
All of the spark plugs are also changed.

Thank you in advance and sorry for my bad english!

PS: Added video running rough at cold start.

[J0hnct78]

Originally Posted by ttsvetanov

Hello guys. I am trying to deal with some problems on my recently bought E93 N54 2007
When the car is cold (not started for more than 5 to 6 hours) I am having a rough start with check engine light and of course limp mode. By rough start I mean normal crank start, but very bad engine work with loud injectors and RPM between 500 and 1500. After some seconds (maybe 30 I presume) the engine is starting to work normally (650~ RPM) with limp mode. Then if I shut off and start again the engine – everything is working smoothly. I repeat, this only happens on cold start.
Another problem (I think its not related to the first, but I am not sure) is cylinder injection cut when I kickdown. Restarting the engine is fixing the problem.
The error codes I am getting are:
0029DC – cylinder injection cut – the second problem
0029F2 – high-pressure fuel system, fuel pressure – after the rough cold start
I am not sure where could be the problem – the HPFP or some injector failing?
The things I’ve done so far by know:
- 002E8E – intelligent battery sensor, communication
- 002E98 – generator, communication
- 002E85 – electric coolant pump, communication
- 002E83 – electric coolant pump, energy operation
All of the above problems was fixed by changing the voltage regulator for generator.
- 0029F3 – fuel sensor, electric
- 0029F1 – fuel pressure plausibility
- 02AAF – Fuel pump, plausibility
All of the above problems was fixed by changing the low-pressure sensor with the new design of Bosh.
- 0029D0 – Misfiring, cylinder 4
The problem was fixed with changing the injector for cylinder 4 (with brand new index 12_.
All of the spark plugs are also changed.

Thank you in advance and sorry for my bad english!

Hi,

Mine was running bad when cold. After I did the walnut blasting to clean the intake valves it ran a lot better.

[ttsvetanov]

Intake valves are already cleaned, i am pretty sure that the problem is related with fuel preparation.

[ttsvetanov]

Added video for rough cold start.

[lukemcmullen45]

To me that sounds like the HPFP. You mentioned one injector was index 12. Are they all index 12? You can’t mix and match index’s (with the exception of 11 and 12 I believe). Maybe there’s a chance the injectors are a little bit clogged, try running a fuel additive through one time and see if it does anything. It can’t hurt anything to try.

[chiefsotos]

same problem here, in the first cold start when the outside temperature is below 15c i have rough idle with same symptoms, limp mode and sometime shut off. After second start engine running perfect.
Never found what the problem be and this is happening 2 years now.

[ttsvetanov]

Originally Posted by lukemcmullen45

To me that sounds like the HPFP. You mentioned one injector was index 12. Are they all index 12? You can’t mix and match index’s (with the exception of 11 and 12 I believe). Maybe there’s a chance the injectors are a little bit clogged, try running a fuel additive through one time and see if it does anything. It can’t hurt anything to try.

The injectors are:
Cylinder 1 to 3 - index 01
Cylinder 4 to 6 - index 12

Already tried to cleaned them with Bardhal injector cleaner, no diffrence.

[Saif2018]

Originally Posted by ttsvetanov

The injectors are:
Cylinder 1 to 3 - index 01
Cylinder 4 to 6 - index 12

Already tried to cleaned them with Bardhal injector cleaner, no diffrence.

What codes are you getting at the moment?

[ttsvetanov]

Originally Posted by Saif2018

What codes are you getting at the moment?

The error codes I am getting are:
0029F2 – high-pressure fuel system, fuel pressure – after the rough cold start
0029DC – cylinder injection cut – the second problem

[Saif2018]

Originally Posted by ttsvetanov

Datalog?

[ttsvetanov]

Sorry for maybe a stupid question, but how to log live data? I have ELM327 adapter, USB cable with inpa and insta, but how can i log something?

[Saif2018]

Originally Posted by ttsvetanov

Sorry for maybe a stupid question, but how to log live data? I have ELM327 adapter, USB cable with inpa and insta, but how can i log something?

Use MHD or JB4 to Datalog.

You can also Datalog whilst idling if you have cold start, rough idle issues etc.

[notzz]

I would start with the fuel pump

[ttsvetanov]

The problem is solved, it was the HPFP. After the change of the pump, there is no any performance issues. Also the cold start is smooth. Thank you for the shared suggestions.

[Saif2018]

Originally Posted by ttsvetanov

The problem is solved, it was the HPFP. After the change of the pump, there is no any performance issues. Also the cold start is smooth. Thank you for the shared suggestions.

that's great

[iqraceworks]

Originally Posted by lukemcmullen45

To me that sounds like the HPFP. You mentioned one injector was index 12. Are they all index 12? You can’t mix and match index’s (with the exception of 11 and 12 I believe). Maybe there’s a chance the injectors are a little bit clogged, try running a fuel additive through one time and see if it does anything. It can’t hurt anything to try.

Yes you can as long as you code them in, it's fine.

[Bimmer_Bro]

Originally Posted by ttsvetanov

The injectors are:
Cylinder 1 to 3 - index 01
Cylinder 4 to 6 - index 12

Already tried to cleaned them with Bardhal injector cleaner, no diffrence.

Glad you fixed your issue. I would still Update those index 01 injectors. I also read you can only mix index 12 with index 11 injectors.
Those index 1 may or may not be slightly leaking. Very surprised you have 12s and 1s mixed.

[ttsvetanov]

I replaced all injectors with Index 12 and i code them. No more fuel issues.

[Saif2018]

Originally Posted by ttsvetanov

I replaced all injectors with Index 12 and i code them. No more fuel issues.