P30FF error.....Boost Leak HELP

Tucker020 · 03-02-2013, 02:47 PM

Got the boost leak error yesterday. I've checked all vacuum hoses and diverter valves to make sure nothing has popped off. I can't see/feel any noticeable cracks or splits in any hoses, DV's, or Chargepipe. I know there are possibilities of wastegate problem or FMIC connection..., but I do have one question. I've noticed that when I squeeze the hose in picture 1 below, that I can hear air coming from what seems like one of the solenoids in picture 2. Is that normal or is one of the solenoids stuck open? I read that can be one of the boost leak problems.

Car runs fine with no errors as long as I'm not going over 3-4K RPM. Car idles at -8psi, and will go up to 7psi at about 5K RPM before error occurs. Light usually comes on right at the shift.

Thanks in advanced!

Red_Bean_Bun · 03-02-2013, 02:49 PM

Seeing is not enough .....

enrita · 03-02-2013, 02:54 PM

Just fix the leak...
The hose in the picture is for water cooling, nothing to do with boost

Tucker020 · 03-02-2013, 02:58 PM

Quote:

Originally Posted by enrita

Just fix the leak...
The hose in the picture is for water cooling, nothing to do with boost

Extremely helpful, thank you. I'm trying to determine where the leak is. I wouldn't have thought anything about the hose except that I was hearing air from near the solenoids when I squeeze it.

GMWNashville · 03-03-2013, 08:58 AM

Check/replace your vac lines to your wastegates and solenoids

zeenon53 · 03-03-2013, 09:26 AM

If you have an 07 out in the texas heat it's possible that the vac lines to the wastegates have started to dry rot and crack a little causing a slight leak under full boost. I had a similar problem with my sti when i had one.

Tucker020 · 03-04-2013, 05:01 PM

Thanks for all responses. I will be conducting a more thorough test hopefully tonight or tomorrow night using this write up.

http://www.n54tech.com/forums/showthread.php?t=13114

Will update once problem is solved.

Randomaccess335 · 03-04-2013, 05:08 PM

Ur probably just moving the water moving, if there was leak in coolant line you would know it. I had boost leak issues, I found oil at the connections of the fmic just tighten t clamps more....... But lots of other things it could be, yoda, I'd start with the fmic connections first
R

Sparky68 · 03-04-2013, 05:13 PM

Been chasing mine down for weeks, replacing front 2 vac lines and plugs while it all apart on Saturday. already replaced the stock CP and diverters.

Good luck finding it as yours does exactly the same as mine.

03-02-2013, 02:47 PM	#1
Tucker020 Private 5 Rep 71 Posts Drives: 2007 335i E93 Join Date: Mar 2012 Location: Texas iTrader: (1)	P30FF error.....Boost Leak HELP Got the boost leak error yesterday. I've checked all vacuum hoses and diverter valves to make sure nothing has popped off. I can't see/feel any noticeable cracks or splits in any hoses, DV's, or Chargepipe. I know there are possibilities of wastegate problem or FMIC connection..., but I do have one question. I've noticed that when I squeeze the hose in picture 1 below, that I can hear air coming from what seems like one of the solenoids in picture 2. Is that normal or is one of the solenoids stuck open? I read that can be one of the boost leak problems. Car runs fine with no errors as long as I'm not going over 3-4K RPM. Car idles at -8psi, and will go up to 7psi at about 5K RPM before error occurs. Light usually comes on right at the shift. Thanks in advanced!
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03-02-2013, 02:49 PM	#2
Red_Bean_Bun Captain 63 Rep 944 Posts Drives: E92 Join Date: Nov 2009 Location: Montreal iTrader: (4)	Seeing is not enough .....
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03-02-2013, 02:54 PM	#3
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	Just fix the leak... The hose in the picture is for water cooling, nothing to do with boost __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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03-03-2013, 08:58 AM	#5
GMWNashville Colonel 173 Rep 2,373 Posts Drives: 19 G05, 16 F80, 10 E70x5D Join Date: Jan 2008 Location: Nashville, TN iTrader: (2)	Check/replace your vac lines to your wastegates and solenoids
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03-03-2013, 09:26 AM	#6
zeenon53 Major 44 Rep 1,155 Posts Drives: BMW Join Date: Apr 2010 Location: obx iTrader: (3)	If you have an 07 out in the texas heat it's possible that the vac lines to the wastegates have started to dry rot and crack a little causing a slight leak under full boost. I had a similar problem with my sti when i had one. __________________ 2016 340i xdrive 2009 335i
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03-04-2013, 05:01 PM	#7
Tucker020 Private 5 Rep 71 Posts Drives: 2007 335i E93 Join Date: Mar 2012 Location: Texas iTrader: (1)	Thanks for all responses. I will be conducting a more thorough test hopefully tonight or tomorrow night using this write up. http://www.n54tech.com/forums/showthread.php?t=13114 Will update once problem is solved.
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03-04-2013, 05:08 PM	#8
Randomaccess335 Captain 70 Rep 868 Posts Drives: 07' 335I Join Date: Mar 2011 Location: boynton beach, Fl iTrader: (11)	Ur probably just moving the water moving, if there was leak in coolant line you would know it. I had boost leak issues, I found oil at the connections of the fmic just tighten t clamps more....... But lots of other things it could be, yoda, I'd start with the fmic connections first R __________________ JB4 G5 ISO , AR DP's, DO Meth kit Trunk Mount, ETS 5" Intercooler, M6 Rims, ER Charge Pipe, Fordged DV's, MMp relocated inlets, Ebay 4" chrome Tips, Lux Angel Eyes ********11.910 @ 117.091.851 60'*********
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03-04-2013, 05:13 PM	#9
Sparky68 Brigadier General 800 Rep 4,361 Posts Drives: 2016 M2 Alpine White Join Date: Oct 2012 Location: Cambs UK iTrader: (11) Garage List 2016 BMW M2 [0.50] 2017 BMW F30 330D [0.00] 2014 M135 [0.00] 2007 BMW 335i [0.00]	Been chasing mine down for weeks, replacing front 2 vac lines and plugs while it all apart on Saturday. already replaced the stock CP and diverters. Good luck finding it as yours does exactly the same as mine. __________________ OG M2 7sp DCT Masata FMIC -Masata Boost Pipe - Cobra Catless DP - Powervalve Exhaust - Devilsown Methanol Injection Turbosmart BOV BM3 Stage 3 Halim custom map Pure 500
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