No boost with jb4
Thread Starter
Junior Member
Joined: Feb 2023
Posts: 20
Likes: 1
c43
Thread Starter
Junior Member
Joined: Feb 2023
Posts: 20
Likes: 1
c43
Finally
Just want to update dealer took the car for the 5th time and changed the ECU and everything works perfect supposedly the engineers didn’t see anything on the old ecu ( guess the jb4 really is invisible) ….anyway it’s to late cause I already have a lawyer for a lemon law case ….. so it looks like it wasn’t the jb4 after all 😮💨
Junior Member
Joined: Jan 2020
Posts: 68
Likes: 19
2019 AMG C43 Wagon
I've encountered this 3 times in the last couple months since I installed the JB4. A quick restart fixes it... even done it while moving by knocking it into neutral :-). No warning, no obvious overboost scenario... just all of a sudden its a slow car...
No solution yet?
No solution yet?
Junior Member
Joined: Jan 2020
Posts: 68
Likes: 19
2019 AMG C43 Wagon
A little update - this problem has completely vanished since removing the JB4 and getting a EC tune. If I were a betting man, I would suspect the BMS allows for occasional overboost situations... which forces the ECU into limp mode. ECU tune, CPC and no JB4 for months now and not a single issue.
