I'm desperate, please help me! F10 535i N55 stalls when warm.

[Salvarinho]

Hello lovely people from this community,

I have this problem since two months now, which literally drives me crazy!


About the symptoms:
Very noticeable jerking, stuttering and starting difficulties when the engine is warm/hot. Sometimes the engine won't even start at all. Engine has starting-problems.
The problem only occurs after the engine has warmed up and ONLY when starting/idling.
Error only occurs after about 10-15 minutes after the car has been shut down.

ISTA says P0172: system too rich; which means that the DME either detects too little air or too much gasoline.



So to reproduce the problem:
1. Car start perfectly when cold, not a single problem or vibration!
2. I drive half an hour normally (City/motorway)
3. Shutting the car off.
4. Waiting 15 - 20 minutes
5. Restarting the engine
6. Either the car starts with huge difficulties (sputters, shakes, jerks) OR it stalls and shuts off immediately.




So far I've replaced:
Intake manifold gaskets. (Even though this can't be the cause of the issue, since in the event of an air leak the DME would detect too much air and not too little (or am I wrong there?)
6x injectors
6x spark plugs
6x ignition coils
MAF
2 O2-sensors
2 MAP sensors
Air Filter
Engine oil change (with filter)
2 Camshaft Positioning sensors
Cleaned both Vanos-Selenoid
Crankshaft Positioning sensor

I'm desperate and on the verge of a mental breakdown

Someone got an idea?



https://www.youtube.com/watch?v=lBPZEJDPXTw




Any help is appreciated

[f10_M550i]

Hello lovely people from this community,

I have this problem since two months now, which literally drives me crazy!


About the symptoms:
Very noticeable jerking, stuttering and starting difficulties when the engine is warm/hot. Sometimes the engine won't even start at all. Engine has starting-problems.
The problem only occurs after the engine has warmed up and ONLY when starting/idling.
Error only occurs after about 10-15 minutes after the car has been shut down.

ISTA says P0172: system too rich; which means that the DME either detects too little air or too much gasoline.



So to reproduce the problem:
1. Car start perfectly when cold, not a single problem or vibration!
2. I drive half an hour normally (City/motorway)
3. Shutting the car off.
4. Waiting 15 - 20 minutes
5. Restarting the engine
6. Either the car starts with huge difficulties (sputters, shakes, jerks) OR it stalls and shuts off immediately.




So far I've replaced:
Intake manifold gaskets. (Even though this can't be the cause of the issue, since in the event of an air leak the DME would detect too much air and not too little (or am I wrong there?)
6x injectors
6x spark plugs
6x ignition coils
MAF
2 O2-sensors
2 MAP sensors
Air Filter
Engine oil change (with filter)
2 Camshaft Positioning sensors
Cleaned both Vanos-Selenoid
Crankshaft Positioning sensor

I'm desperate and on the verge of a mental breakdown

Someone got an idea?



https://www.youtube.com/watch?v=lBPZEJDPXTw




Any help is appreciated

What happens if you disconnect the battery for a bit and then reconnect it?
I would have thought injectors but it looks like you replaced them.

I wonder if the problem is the control unit for the electric fuel pump? It's located in the trunk next to the battery. It's suppose to regulate the amount of fuel being delivered. could be faulty. I think they do go bad some times.

[White94RX]

Not exactly correct. The EKPS does control the fuel pump by varying the voltage, but I'm almost certain they still use a standard pressure regulator to prevent too much fuel pressure. I think the EKPS just slows the pump down when fuel demands are lower, thereby saving on power, for fuel economy.

[Salvarinho]

So guys I solved the Issue! TB was somehow defective. But the most noticeable effect was after an oil flush followed by an oil change. The Short-distance-driving had a massive effect on the engine oil e.g. Oil dilution with Gasoline. Thats why I got "System too rich"

First of all I let the old oil out. Secondly I put 6 Liters of new "old" oil (with new Filter) as a cleaning agent together with an engine flush to get all the crud out.
Last but not least I let the everything out and put the new "Ravenol RCS 4w-40". AMAZING OIL!! I HIGHLY RECOMMEND IT!


So everything is fine now

[dewana421]

So guys I solved the Issue! TB was somehow defective. But the most noticeable effect was after an oil flush followed by an oil change. The Short-distance-driving had a massive effect on the engine oil e.g. Oil dilution with Gasoline. Thats why I got "System too rich"

First of all I let the old oil out. Secondly I put 6 Liters of new "old" oil (with new Filter) as a cleaning agent together with an engine flush to get all the crud out.
Last but not least I let the everything out and put the new "Ravenol RCS 4w-40". AMAZING OIL!! I HIGHLY RECOMMEND IT!


So everything is fine now

okay totally lost...what is TB????? that was defective...................
you just changed your oil and problem went away??? are you saying you never changed the oil for a long time?

[Solidsnake227]

So guys I solved the Issue! TB was somehow defective. But the most noticeable effect was after an oil flush followed by an oil change. The Short-distance-driving had a massive effect on the engine oil e.g. Oil dilution with Gasoline. Thats why I got "System too rich"

First of all I let the old oil out. Secondly I put 6 Liters of new "old" oil (with new Filter) as a cleaning agent together with an engine flush to get all the crud out.
Last but not least I let the everything out and put the new "Ravenol RCS 4w-40". AMAZING OIL!! I HIGHLY RECOMMEND IT!


So everything is fine now

What is TB?

[DRTE30]

What is TB?

Throttle Body

https://www.realoem.com/bmw/enUS/sho...diagId=13_1181