Misfires on cylinder 6 at high boost... weak hpfp ?

Eurofam

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Oct 4, 2020
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Hey guys old post I know but it seems I’m having the same issues,
e92 335i auto trans, stock rebuilt turbos, index 10 injectors, brand new coilpacks and spark plugs gapped to .022, new hpfp, lpfp, new vanos solenoids, camshaft position sensors and crankshaft position sensor, running msd81 with mhd stage 2, only code pulled is cylinder 6 misfire. I’m a noob with bmw’s and I’m not really sure how to tell what’s wrong by looking at the logs I have. Seems to rough idle and misfire at any rpm, anything past quarter throttle instant misfire on 6.
 

Attachments

  • 2020-09-26 14_04_17 IJE0S v9.0 Stage 2 91oct_95ron b1AT_noALP.csv
    7.9 KB · Views: 16

Eurofam

Private
Oct 4, 2020
42
7
0
Hey guys old post I know but it seems I’m having the same issues,
e92 335i auto trans, stock rebuilt turbos, index 10 injectors, brand new coilpacks and spark plugs gapped to .022, new hpfp, lpfp, new vanos solenoids, camshaft position sensors and crankshaft position sensor, running msd81 with mhd stage 2, only code pulled is cylinder 6 misfire. I’m a noob with bmw’s and I’m not really sure how to tell what’s wrong by looking at the logs I have. Seems to rough idle and misfire at any rpm, anything past quarter throttle instant misfire on 6.
 

Attachments

  • 2020-09-25 20_55_34 IJE0S v9.0 Stage 2 91oct_95ron b1AT_noALP.csv
    7.2 KB · Views: 13

Eurofam

Private
Oct 4, 2020
42
7
0
You have a injector problem on bank 2 either wiring or you need new injectors its most likely no 6

Thank you for the input!! Cylinder 6 is the only one that’s misfiring, I can say that I have tried the leak test and no 6 didn’t leak. I thought maybe it’s clogged as someone on N54 tuners on Facebook suggested injector cleaner so I ran some thru the system after these logs and it seemed to help cut down some of the misfiring
 

martymil

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Sep 6, 2017
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Once these injectors start stuffing up they are usually toast, you can see it in your logs how bad bank 2 is.

I would change the injectors in bank 2 and go from there.
 
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