BMW X1 (E84) 2011 no accelaration after stop

[x1beemer]

Hellow everyone!!

First of all i'll tell you the model and mileage - BMW X1 (E84) 2011 / 150K
I faced an issue twice. one in a few months back and one today morning.

Both times I was at a red light. stopped. stayed around 30 secs.

First occurrence

Released the brake and slowly pressed the gas pedal (just like a normal day)
engine is on. no rpm movement. slowly moving forward. with jerking. (like vehicle about to cough)
Then I stopped the vehicle. Put to the P. turned off engine. started the engine. put to D gear.
same. pressed the gas pedal to the floor. vehicle moving slowly with jerk.
then suddenly all went ok and moved forward.
took the vehicle for an inspection. no issues found.


Today occurrence

Released the break and slowly pressed the gas pedal.
engine is on. no rpm movement. slowly moving forward. no jerk.
pressed the gas pedal to the floor. no effect. slowly moving. Then I took off from the road and hit the brake to stop. then the engine went off in D gear.
Dashboard is on. No errors displayed.
Then I put it to P. Started the vehicle. went to the office. no issues.


I don't have much knowledge, but I want some opinions from the experts.

[wheela]

Curious if your DME isn't getting the signal from the accelerator pedal, or the throttle isn't getting the signal from the DME, or the throttle is getting the signal, but the plate is getting stuck and not opening?

Do you have any logging software? It would be nice to log pedal position, throttle position request, and throttle position actual when this happens to see what the DME is seeing/doing. If you have the n55 motor (35i) you can use the MHD app to log these things. I don't think MHD works for the other engines, but perhaps others can chime in with what software you could use if you're not n55.

For example, here's some screenshots from one of my MHD logs, I've circled the parameters I mentioned above.

[x1beemer]

Originally Posted by wheela

Curious if your DME isn't getting the signal from the accelerator pedal, or the throttle isn't getting the signal from the DME, or the throttle is getting the signal, but the plate is getting stuck and not opening?

Do you have any logging software? It would be nice to log pedal position, throttle position request, and throttle position actual when this happens to see what the DME is seeing/doing. If you have the n55 motor (35i) you can use the MHD app to log these things. I don't think MHD works for the other engines, but perhaps others can chime in with what software you could use if you're not n55.

For example, here's some screenshots from one of my MHD logs, I've circled the parameters I mentioned above.

Thanks mate for your reply. i don't have necessary tools. issue happened again and i did a scan though my mechanic. here is the result.

please help me with this report and explain. what should be the next steps based on this?

[wheela]

Sorry, I'm not familiar with that app - are those all active codes that are listed? I see mention of a glow plug, you must be a diesel engine?

[x1beemer]

Originally Posted by wheela

Sorry, I'm not familiar with that app - are those all active codes that are listed? I see mention of a glow plug, you must be a diesel engine?

Yes, according to the mechanic it's either clean or replace the EGR valve.
maybe replace the glow plugs too.

Yes its Diesel engine comes in X1 E84