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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Can I get some opinions on this log?



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      12-31-2013, 10:31 AM   #1
Krells
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Can I get some opinions on this log?

http://datazap.me/u/krells/jb4-map-1-dci-e30

I have been having random cylinder 6 misfires and cylinder deactivation on map 5. Map 1 seems to not trigger SES or any codes. I am try to see if my issues are with an injector or if my HPFP is going out again. Thanks for looking.
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      12-31-2013, 10:41 AM   #2
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Are these long term or short term fuel trims?
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      12-31-2013, 10:49 AM   #3
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I am still new at this but from the info I read about jb4 logging they should be short term fuel trims in the log.
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      12-31-2013, 11:45 AM   #4
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Then the scaling is screwed up somehow, fuel trims max at +34. At that point the DME cannot deliver more fuel.
Either way you are running into a fueling limitation. Ideally you’d run a back end flash to handle timing, VANOS, fueling, and other stuff while leaving iso boost control to the piggyback. You should be able to get away with E30 piggyback only, but different cars react differently.

Would be useful to log LPFP PSI to see if it’s taking.
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      12-31-2013, 04:44 PM   #5
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Is that what is showing as fp_l ? Or am I looking for something else?
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      12-31-2013, 05:22 PM   #6
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Quote:
Originally Posted by Krells View Post
Is that what is showing as fp_l ? Or am I looking for something else?
Yes it is, sorry didn't see it at first. It's all over the place. Also, JB displays fuel trim on a sliding scale of 50 I believe
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      12-31-2013, 07:18 PM   #7
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Okay. So log without e85 and see how it goes. Probably need a new lpfp and a flash in the spring to continue with e85, correct?
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      12-31-2013, 07:34 PM   #8
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FP_L is your low pressure fuel pump. It seem's that you are maxing it out, dips of 48 and low 50's are not good, Probably why you are reverting to map 4. You're logs are also showing your fuel trims maxing out from the E85, could be from the failing LPFP also. I would suggest either less E85, adding a 255 inline pump or meth. As for the misfire you should start with a spark plug change.
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