E92 335i loss of power, no boost. Help?

TecTonic · 05-09-2020, 03:57 PM

Hello,

I am new to this forum so please bare with me. I own a 2009 335i that has had bolt-on modifications including; FMIC, Charge Pipe + BOV, Cone air filters and MHD tuning v8.0 stage 2+.

There is notably a loss in power, the turbos in particular are not spooling as it should. The BOV is not audible which I suspect is associated with the turbos not operating.
I have produced a datalog during my latest run with the vehicle: https://datazap.me/u/tectonic

Apart from the issues, there are no problems with start up and there are no sounds that would be of concern. I have checked only visually for any abnormalites in the engine bay such as vacuum hoses but I just have no idea why it's not holding boost. In addition, no fault codes were present when I datalogged my last trip.

Any suggestions would be grateful, thank you.

RajB · 05-18-2020, 04:35 PM

Hmm difficult one especially as no errors. I would have thought vacuum but then even that should throw an error.

buddyboy · 05-27-2020, 03:08 PM

I find these cars can be pretty slow to throw a code sometimes. Did you fit all the parts yourself ? Check intercooler pipes, chargepipe to throttle body connection, hoses to boost solenoids, hoses to vacuum cannisters.

How does it feel when accelerating? Very strange it is throwing codes. What are you using to check fault codes. mHD won't show all fault codes. Protools is much better for that

05-09-2020, 03:57 PM	#1
TecTonic New Member 0 Rep 5 Posts Drives: BMW 335i Join Date: May 2020 Location: United Kingdom iTrader: (0)	E92 335i loss of power, no boost. Help? Hello, I am new to this forum so please bare with me. I own a 2009 335i that has had bolt-on modifications including; FMIC, Charge Pipe + BOV, Cone air filters and MHD tuning v8.0 stage 2+. There is notably a loss in power, the turbos in particular are not spooling as it should. The BOV is not audible which I suspect is associated with the turbos not operating. I have produced a datalog during my latest run with the vehicle: https://datazap.me/u/tectonic Apart from the issues, there are no problems with start up and there are no sounds that would be of concern. I have checked only visually for any abnormalites in the engine bay such as vacuum hoses but I just have no idea why it's not holding boost. In addition, no fault codes were present when I datalogged my last trip. Any suggestions would be grateful, thank you.
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05-18-2020, 04:35 PM	#2
RajB Brigadier General 448 Rep 3,312 Posts Drives: E92 335i Join Date: Nov 2014 Location: Midlands iTrader: (4)	Hmm difficult one especially as no errors. I would have thought vacuum but then even that should throw an error. __________________ E92 335i / M3 Hybrid - The Build
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05-27-2020, 03:08 PM	#3
buddyboy First Lieutenant 265 Rep 331 Posts Drives: 17 540ix Join Date: Oct 2018 Location: Ireland iTrader: (0)	I find these cars can be pretty slow to throw a code sometimes. Did you fit all the parts yourself ? Check intercooler pipes, chargepipe to throttle body connection, hoses to boost solenoids, hoses to vacuum cannisters. How does it feel when accelerating? Very strange it is throwing codes. What are you using to check fault codes. mHD won't show all fault codes. Protools is much better for that
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