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Jasmeleg Jasmeleg is offline
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Posts: 14
Join Date: Mar 2015
Car: '07 E90 335i Arktis Metallic 6MT
Default E82 N55 E20-30 Misfires now Super Knock Codes - 05-30-2021, 07:04 PM

I have been chasing some issues at higher boost levels.

Car setup:
E82 135i N55 6mt 102Kmi (06/2012 build with Bosch style HPFP)
AFE Intake
Aluminum Chargepipe
VRSF Offroad DP
(Genuine, not Ebay knockoff) NGK 97506 Plugs gapped at 0.022"
Delphi GN10571 Coils
93 octane fuel with 3gal of E85 (E20-25) was at 1/4 tank at time of logs
N55_ISO_5_17_T5 firmware

I installed the JB4 and was running map 5 for a little bit of time without issue. I don't drive this car that often with working from home and it not being my daily.

I decided to do a BEF and try a little ethanol and that's when I first started having a misfire code. Anytime I would go WOT and get > 14-15psi of boost I would hit a wall and all kinds of misfires. I had records of the plugs being done 40K miles ago and but they were stock replacements and stock gap. Replaced the plugs with one step cooler plugs and new coils because those looked original to the car.

On the drive to test out the new coils and plugs to see if the misfires went away, I got a code 2F7C and 2F7A. I guess the good thing is I am not getting a misfire anymore but the knock codes are concerning!

Here is a link to the most recent logs from a drive earlier today. The events at the very end of the drive are when it was hitting a wall. Basically will pull great up to 5K rpm then will hit a wall. From looking at the logs myself it does not look like I am running out of fuel :/

Any and all help is appreciated!! This is the second car I've owned with a JB4 and definitely love the platform and product.
Attached Files
File Type: csv P5_M5_R15_210530_1543.csv (70.3 KB, 55 views)

Last edited by Jasmeleg; 05-30-2021 at 07:06 PM.. Reason: Can Not Post Datazap
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