I'm gonna cut straight to the chase, I have a 318D E91.

About 2 months ago I bought a BlueSpark tuning box, put it on max setting and it was working fine for a couple of weeks then the EML came on. So I knocked it down a setting which caused the light to go out and everything was fine again. Some time down the line I noticed a problem between 1500-2000rpm, sometimes when going around roundabouts I would experience some kind of power loss or a misfire, if I keep the rpm between this range on a straight road I can feel some sort of small jerks (very subtle) as if something is pushing back on the car. I have plugged my car in and got P3043, P0101, P0402. I have taken the EGR off and cleaned it, replaced the Mass Airflow Sensor and it still hasn't fixed my problem. I'm now considering a bad fuel pump? MAP sensor? Injectors? No idea what's going on and btw I have taken the box off and the problem persists.

Please could someone point me in the right direction?

[feuer]

Originally Posted by Raakhuga

If you're experiencing actual missfires i would opt for new spark plugs, if the fuel pump is broken check when you turn the engine to second contact if the fuel pump pre-pumps fuel, but the car shouldn't even start if the fuel pump is broken .. ofcourse im new to the forum and i also recently bought my first BMW, also a E91, are you sure it's not just your traction control on roundabouts ? 😅 check if the engine idles Badly and/or irregular, in that case iT COULD be the spark plugs. I'm no expert though

Definitely you are NOT and expert as 318d doen NOT have spark plugs.

[juld0zer]

Take the shitbox off?

Sometimes you have to pay to play and running a tuning box on its maximum setting on a stock engine is asking for trouble.

What year is your car?

Originally Posted by juld0zer

Take the shitbox off?

Sometimes you have to pay to play and running a tuning box on its maximum setting on a stock engine is asking for trouble.

What year is your car?

The box is off, the year is 2010

[juld0zer]

Sooted intake ports?