BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > 30FF turbo problem?

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      12-01-2019, 04:48 AM   #1

Drives: BMW E90 335I
Join Date: Sep 2019
Location: Hong Kong

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30FF turbo problem?

Hello guys.. I am a newbie..just bought an e92 n54 335i about 2 months..and this car drives me crazy enough..

1st day I went deep throttle and got the half engine light when over 3-4k rpm... but the light disappeared when I restarted the car..So I sent it to garage.. the technician told me 30FF code was found.. had checked the vacuum line by smoke.. seems nothing leak.. they suggested me to replace 2 pressure converters.. and I told them to replace the VRSF's charge pipe with bov, cone intake and bigger intercooler..I thought everything is gonna be ok.. but it isn't..

Still find the half engine light when I go deep throttle over3300rpm.. no sound from the bov..no sound from the wastegate.. no white smoke observed from the exhaust..just a bit loud from the exhaust.no acceleration clearly between 50-90km/h.. until over 100... I can feel some power is going up slightly but not fast.. just like an N/A.. I feel there is some power loss.. just feel like I am a 3-legs horse.. the technician told me maybe 1 high boost turbocharger is dead.. highly recommend me to replace the turbos...well you know.. the labour fee will cost a lot.. the money for my stage2+ planning is gone..all gone for the repair fee..and now I am wondering I should have listened to him? Is there the other way to check before the worse case?

Really sad.. I hope you guys can give me some suggestions, thank you.
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E92 335i N54=money gone
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      12-02-2019, 06:16 AM   #2
Lieutenant Colonel

Drives: 2012 335i Sedan
Join Date: Oct 2012
Location: Vancouver, Canada

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30ff is a Vaccum Leak.
have your Vacuum lines replaces, should cost you no more than 30.
if you do it yourself.

see my diy on the front turbo actuator vacuum line.

Get high temp silicone lines, and do not replace the plastic lines that go over the engine.

just keep in mind, that you car is 10+ years old and plastic will deteriorate and a small leak is enough. smoke test may not be enough.
you have to do a vacuum test.
replace lines is cheaper than a Vacuum test.

I would start there.
good luck.
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      12-02-2019, 09:33 AM   #3
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Drives: BMW 335xi N54 Auto
Join Date: Apr 2019
Location: Ottawa Ontario

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replace the boost solinoids and run a lower stage. 99% you are getting throttle closures and the DME is compensating. If you replaced all those parts without MHD that would be pretty weird. If you have MHD please post a log.

When your mechanic tells you to replace the boost solinoids and you tell him to add performance parts............................................. .............
Synapse Bov, CP, AA Intercoooler 5", ARM DP's
MHD Stage2+/xHP/xDelete
Road to 500hp daily on the way
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