30ff low boost pressure

335sss · 02-19-2015, 05:10 PM

2010 bmw 335 63000miles

Got 30ff code last night when driving normal merging on freeway then was only able to boost 8 psi which would drop down to 5. Today boost is going up to 12 psi and drops to around 11 And no half engine light has come on today as yet.

Recently install jb4 about 4 days ago. Now have 30ff boost leak code. Current mods are 7" vrsf intercooler, jb4, vrsf chargepipe.

Changed stock diverter valves a month before jb4 install to new stock diverter valves. Could the new stock diverter valves be leaking already?Noticed hissing when car is running from around the front intake/diverter valve area. Intercooler looks fine.

Any help would be appreciated
thanks

135Pats · 02-19-2015, 05:45 PM

V likely the stock DVs....They suck, in candor.

Get some soapy water on the clamps/hose and see if it bubbles when you give it some gas, that'll help narrow down boost leaks. Good news is boost leaks are rarely "hard" or expensive to fix, bad news is they're a PITA to track down sometimes.

335sss · 02-19-2015, 06:12 PM

Oh ok thanks. It's just strange because I replaced the stock diverter valves a month ago to new stock diverter valves and I would think they wouldn't break so easily but as you said they suck. Today I haven't gotten any codes as yet. I will try they soap and water and see if I get any bubbles.

335NJ · 02-19-2015, 06:18 PM

Did you make sure the O-Ring and clip are seated properly around the throttle body from the CP?

335sss · 02-19-2015, 06:45 PM

I tugged on it when I put it on and it seemed ok. The chargepipe was just a little bit shaky but not by much at all.

335sss · 02-19-2015, 06:54 PM

I did get a 2d2e angle of throttle valve code but I read that I should ignore it as it is a plausibly code from extra lag fix in jb4. Idk if this is associated with the 30ff code.

jonas · 02-19-2015, 07:19 PM

Codes gone, problems gone!

No, but seriously, if you have a keen ear, boost leaks are very easy to track. Soapy water works well too, but can be hard to get in some places, and then see said places after. Please do report back confirmed problem, and solution!

335sss · 02-19-2015, 08:37 PM

Thanks. I hear sum air hissing around the front of the car where the diverter valve is and the intercooler charge pipe. I think I'm just gonna go ahead and change the diverter valves to some the turbosmart or forge ones. Maybe the new stock diverter valves got stuck some how last night and are probably going bad. Hopefully this fixed the problem.

335sss · 02-21-2015, 05:33 PM

Installed turbo smart dvs and cel hasn't came back yet. Hopefully this fixed it.

335sss · 02-22-2015, 02:21 AM

Driving home tonight merging on freeway driving normal and 30ff code back again. Maybe vacuum lines need to be changed next?

Lawton438 · 02-22-2015, 01:30 PM

My bets on vacuum line.

I had exact same issue, it ended up being the one that ran at the front of the engine just under the engine plastic cover, but as said just trace them all and make sure you give them a riggle where they're terminated.

335sss · 02-23-2015, 03:25 AM

Ok thanks. I'll try that next. Should I get the oem vacuum lines? Or do u have any suggestions which ones to get?

02-19-2015, 05:10 PM	#1
335sss Private First Class 9 Rep 159 Posts Drives: rip-10 335 e90/current-09 e92 Join Date: Dec 2013 Location: Chicago iTrader: (1)	30ff low boost pressure 2010 bmw 335 63000miles Got 30ff code last night when driving normal merging on freeway then was only able to boost 8 psi which would drop down to 5. Today boost is going up to 12 psi and drops to around 11 And no half engine light has come on today as yet. Recently install jb4 about 4 days ago. Now have 30ff boost leak code. Current mods are 7" vrsf intercooler, jb4, vrsf chargepipe. Changed stock diverter valves a month before jb4 install to new stock diverter valves. Could the new stock diverter valves be leaking already?Noticed hissing when car is running from around the front intake/diverter valve area. Intercooler looks fine. Any help would be appreciated thanks
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02-19-2015, 05:45 PM	#2
135Pats Major General 461 Rep 6,478 Posts Drives: A few BMWs Join Date: May 2012 Location: Maryland iTrader: (3)	V likely the stock DVs....They suck, in candor. Get some soapy water on the clamps/hose and see if it bubbles when you give it some gas, that'll help narrow down boost leaks. Good news is boost leaks are rarely "hard" or expensive to fix, bad news is they're a PITA to track down sometimes. __________________ E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP F30 N55 XDrive EBII
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02-19-2015, 06:12 PM	#3
335sss Private First Class 9 Rep 159 Posts Drives: rip-10 335 e90/current-09 e92 Join Date: Dec 2013 Location: Chicago iTrader: (1)	Oh ok thanks. It's just strange because I replaced the stock diverter valves a month ago to new stock diverter valves and I would think they wouldn't break so easily but as you said they suck. Today I haven't gotten any codes as yet. I will try they soap and water and see if I get any bubbles.
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02-19-2015, 06:18 PM	#4
335NJ Colonel 535 Rep 2,872 Posts Drives: 2008 335i 6MT E90 Join Date: Feb 2014 Location: NJ/Philadelphia Suburbs iTrader: (1)	Did you make sure the O-Ring and clip are seated properly around the throttle body from the CP?
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02-19-2015, 06:45 PM	#5
335sss Private First Class 9 Rep 159 Posts Drives: rip-10 335 e90/current-09 e92 Join Date: Dec 2013 Location: Chicago iTrader: (1)	I tugged on it when I put it on and it seemed ok. The chargepipe was just a little bit shaky but not by much at all.
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02-19-2015, 06:54 PM	#6
335sss Private First Class 9 Rep 159 Posts Drives: rip-10 335 e90/current-09 e92 Join Date: Dec 2013 Location: Chicago iTrader: (1)	I did get a 2d2e angle of throttle valve code but I read that I should ignore it as it is a plausibly code from extra lag fix in jb4. Idk if this is associated with the 30ff code.
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02-19-2015, 07:19 PM	#7
jonas Private 15 Rep 68 Posts Drives: It's black... Join Date: Feb 2015 Location: United States iTrader: (0)	Codes gone, problems gone! No, but seriously, if you have a keen ear, boost leaks are very easy to track. Soapy water works well too, but can be hard to get in some places, and then see said places after. Please do report back confirmed problem, and solution! __________________ 2013 F350 37 inch tires, and go fast parts 2008 335i JB4, FBO (Powered by Hopes and Dreams) [SOLD] 2002 F-250 40" tires, and other goodies (toy) [SOLD] USAF, Support the Troops
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02-19-2015, 08:37 PM	#8
335sss Private First Class 9 Rep 159 Posts Drives: rip-10 335 e90/current-09 e92 Join Date: Dec 2013 Location: Chicago iTrader: (1)	Thanks. I hear sum air hissing around the front of the car where the diverter valve is and the intercooler charge pipe. I think I'm just gonna go ahead and change the diverter valves to some the turbosmart or forge ones. Maybe the new stock diverter valves got stuck some how last night and are probably going bad. Hopefully this fixed the problem.
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02-21-2015, 05:33 PM	#9
335sss Private First Class 9 Rep 159 Posts Drives: rip-10 335 e90/current-09 e92 Join Date: Dec 2013 Location: Chicago iTrader: (1)	Installed turbo smart dvs and cel hasn't came back yet. Hopefully this fixed it.
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02-22-2015, 02:21 AM	#10
335sss Private First Class 9 Rep 159 Posts Drives: rip-10 335 e90/current-09 e92 Join Date: Dec 2013 Location: Chicago iTrader: (1)	Driving home tonight merging on freeway driving normal and 30ff code back again. Maybe vacuum lines need to be changed next?
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02-22-2015, 01:30 PM	#11
Lawton438 First Lieutenant 45 Rep 393 Posts Drives: 335i Join Date: Apr 2013 Location: Stoke on trent iTrader: (2)	My bets on vacuum line. I had exact same issue, it ended up being the one that ran at the front of the engine just under the engine plastic cover, but as said just trace them all and make sure you give them a riggle where they're terminated.
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02-23-2015, 03:25 AM	#12
335sss Private First Class 9 Rep 159 Posts Drives: rip-10 335 e90/current-09 e92 Join Date: Dec 2013 Location: Chicago iTrader: (1)	Ok thanks. I'll try that next. Should I get the oem vacuum lines? Or do u have any suggestions which ones to get?
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