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Stoolz Stoolz is offline
Senior Member
Posts: 886
Join Date: Jan 2015
Car: 11 135i
Exclamation Worst problem ever N55 - 07-03-2018, 12:09 AM

My car has been off the road for almost 12 months now and I've spent near ten k trying to fix it.
Mods in signature but jb4 and pi pulled out right now.
Car runs perfect (with or without jb4 and over 500whp) while cool.
Once warmed up even stock there is a massive shutdown every pull after being faultless warming up in any gear on any boost on any tune including stock and any fuel at around 4.5k rpm.
I get knock and fueling codes but have replaced ECU, gearbox(dct) , knock, 02, fuel pressure, tmap, and maf sensors. Even though I've had knock codes there is no detectable knock you can hear.
The logs on mhd or jb4 are immaculate, nothing shows up out of the ordinary.
I've also replaced tstat and waterpump.
We are totally running out of ideas.
One thing strikes me is that launch control has some similarities like 4500rpm rev limit and it only works when the car has warmed up but this is probably only coincidence.
Please help if you can!

2011 135i Dct coupe Alpine white n blacked out.
VTT DBB,Pure Inlet, JB4,GFB DV+,MHD,Fuel-it Platinum PI with Cm 5 - 50:50 Meth, E85, N20 tmap, Fuel It S2 lpfp, KB Boost A Spark, BMS IC /CP / IT / OCC, SG Boost Pipe, Quaife LSD, Federal RS-RR,M4 Flywheel, SSP R spec clutches, Kw V3 & Pro rolled guards, AR CL **, Bmw PE. Custom mi**ipe kitties. 1000wrms custom audio.

Last edited by Stoolz; 07-03-2018 at 04:18 AM..
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