[gvnyo]

Lately as I drive my car it kind of jerks during acceleration, no limp mode or anything similar (i've dealt with that before) this is a different kind of feeling. Revs seem normal but it does feel jumpy. I took my car out for a spin today and I noticed it felt weak in the beginning, and as i accelerated it got worse and worse, i did a log on my jb4 and i was able to see that boost was just jumping like crazy. I did a 0-60 and slowly built up boost to 17psi around 3600rpms then it went straight to 19psi @ 3700rmps and then dropped straight back to 11psi @ 3750rpms and then back up to around 14psi and then down again to 11psi and all while staying in 3rd gear. I've never gone to 19psi, its usually around 14/15 so i dont know whats going on, and dont know how to adjust boost level on the jb4 either. Does anyone have any input on this or what could be causing the boost to bounce like this? Thanks in advance!

[MysticRob]

Check all your vacuum lines...

[gvnyo]

Originally Posted by MysticRob

Check all your vacuum lines...

Wouldnt that throw off a 30ff code?

[azra_sehic96]

I got all 6 injectors changed on my 435i about a month ago and the fuel pump, about 3 days later I started experiencing my car jerking under acceleration, I drove with it like that for about a month and just recently took it to get diagnosed at my local bmw and after two days of testing it and running it through the computers he told me my car is just performing at its best ability due to all 6 injectors being changed, I'm still iffy about it but no lamps came on within the month of driving it

[azra_sehic96]

also he told me at this point my traction control is doing it to keep the car performing how it should

[BM3Rrrr]

Your mechanic must be on drugs....
So he is telling you that jerking acceleration is normal and the car is performing at its best?