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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 > Need help with a loss of power issues!!



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      01-31-2013, 11:30 PM   #1
slostjoe
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Okay, instead of driving Terry any more crazy than I already have I'm making this thread because I'm having some severe issues with power loss on my 08 335, The modifications I have are the ones listed in my signature.

So everything was fine and I had been running 100% E85 with no issues for several thousand miles,

Then out of the blue it sounded like my car started misfiring. I sent logs to Terry and he seemed to think everything looks somewhat fine So to trace down the issue we went back to pump gas I still felt a severe loss of power below 4000 rpm's and pretty much anywhere in wide-open throttle even after returning to pump gas my car always throws random codes but they are never the same ones except last few days its been throwing fuel mixture codes and then a fuel pressure code.

So I just ordered the low and high fuel pressure sensor. I've logged and watched my fuel pressure and didn't see any issues there either. So i removed the Cobb and Jb4 and the car still feels very underpowered.

So my question is....was it a waste to replace these sensors or should I be looking somewhere else?

Thanks, Skyler.
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      01-31-2013, 11:38 PM   #2
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Quote:
Originally Posted by slostjoe
Okay, instead of driving Terry any more crazy than I already have I'm making this thread because I'm having some severe issues with power loss on my 08 335, The modifications I have are the ones listed in my signature.

So everything was fine and I had been running 100% E85 with no issues for several thousand miles,

Then out of the blue it sounded like my car started misfiring. I sent logs to Terry and he seemed to think everything looks somewhat fine So to trace down the issue we went back to pump gas I still felt a severe loss of power below 4000 rpm's and pretty much anywhere in wide-open throttle even after returning to pump gas my car always throws random codes but they are never the same ones except last few days its been throwing fuel mixture codes and then a fuel pressure code.

So I just ordered the low and high fuel pressure sensor. I've logged and watched my fuel pressure and didn't see any issues there either. So i removed the Cobb and Jb4 and the car still feels very underpowered.

So my question is....was it a waste to replace these sensors or should I be looking somewhere else?

Thanks, Skyler.
Sounds like a high pressure fuel pump. 100% e85 will do that to these pumps. What are your exact faults?
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      01-31-2013, 11:44 PM   #3
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Are you asking what are the exact codes its throwing?

If so..

29f4
29f3
29f5
2d25
2ef4

These are just some of them. Lol
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      01-31-2013, 11:55 PM   #4
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Damn 100% E85...I dont know too many people running such a high content of E85. 29f3 is definitely the LP fuel sensor. I would change one sensor out at a time..
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      02-01-2013, 12:10 AM   #5
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Quote:
Originally Posted by cn555ic
Damn 100% E85...I dont know too many people running such a high content of E85. 29f3 is definitely the LP fuel sensor. I would change one sensor out at a time..

Yes sir, I've been running it for about 4,500mi with zero issues. I miss it so much! I want this fixed so bad.

The LP sensor is under the intake manifold correct?
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      02-01-2013, 10:01 PM   #6
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