[oskars89]

Hello!
I have issue with my e90 N47 2008. While driving in city in 1st 2nd gear it drops check engine and stalls, then it takes up to 5sec to restart car, feels like no fuel in system. I did connect computer, when car stalled, it showed an error - fuel rail/system pressure too low P0087. Outside city it newer stalls..

[Jturbo_M3]

Sorry to hear that man, a failing fuel pump may struggle to maintain pressure, especially at lower speeds or under heavy demand. A clogged fuel filter can also reduce pressure. Consider replacing it if it's been a while. Also, there might be issues with the fuel pressure sensor providing incorrect readings or problems within the fuel rail itself.

[oskars89]

Thanks for reply!
I did change fuel filter, but no changes.
I was also thinking about rail pressure sensor, but is it possible that sensor fails, then works again? Usually engine stalls when driving out of parking, even with warm engine, it can stall 3 times a day, then month no issues, then again it stalls. When the car stalls, it tries to crank it back, but fastest way to turn on engine back on is to remove key, reinsert and start engine.
You said about fuel pump, you mean pump in tank or high pressure pump?

[Jturbo_M3]

It's possible that the fuel rail pressure sensor could be intermittently failing, causing changes in fuel pressure and leading to stalling issues. Also, I meant the pump in the tank.

[oskars89]

Thank you! Will start with sensor replacement then 👌

[Jturbo_M3]

Hopefully, everything turns out fine. keep me posted.