Quote:
Originally Posted by ClampThurst
I've had this on my X3 2017(73,000 miles) N55 motor as well(even posted on here about it and noone had any good input on it). It used to do it a bunch and one day I disconnected the batter power for one minute and it went away but is now back after a few months. I am getting an "under voltage in vehicle" computer code (4809AB) not sure why, might be a drop in voltage while starting. Also getting a "ZGM central fault memory full-no control unit fault"(801C20) Not sure if these are related to the idle problem. Mine ranges from 700-1000 RPM at street light after stopping. Have you noticed if it does it in manual gear select mode??? Mine did not, the RPM variations only occurred when coming to a stop in automatic transmission mode only. It occurs with Climate control on and off.
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No I haven't checked while in manual gear box mode. I'm always in automatic gearbox mode.
I'll check if it does it in manual gear box mode.
The RPM's will only jump up and down at a full stop, or while in heavy traffic. It doesn't happen often though…
I was driving the x3 last night and it was fine. RPM stable at every red light/full stop in traffic.
Once I let go of the brake pedal, RPM comes back to normal reallll quick.
It accelerates fine and puts down power all the way through each gear/RPM band without any hesitation.
So I doubt it's fuel injectors.
Sometimes no one will answer and we got to figure it out by ourselves