JB4 Map 5 or 1 = 30FF, Map 4 = no issue

TexE90 · 04-01-2013, 10:19 AM

Running Map 5 or map 1 on my JB4 gives me a 30FF WOT. I gun it, psi builds to ~10-12 psi, car shifts gears, psi drains until it drops below 5 psi at which point the 30FF code is thrown.

Map 4... I gun it, psi builds to 8-9psi, car shifts, psi drains but stays just north of 5psi. No code is thrown.

My car is stock except for JB4 and DCI - '07 e90.

My turbos were replaced ~3k miles ago so I can't imagine they are already struggling.

I've tried to listen for the "tornado siren" sound but all I hear is the whistle of the DCI. Is there anything else I should be on the lookout for? Will a smoke test show anything since psi goes away after gear shift only? I'm not sure when my plugs were last changed - could it be that? No SES is thrown.

At a loss on this one... Any help is appreciated.

marv85 · 04-01-2013, 10:20 AM

boost leak, boost control issue (boost solenoids, vacuum lines leaking/broken)

TexE90 · 04-01-2013, 10:23 AM

Quote:

Originally Posted by marv85

boost leak, boost control issue (boost solenoids, vacuum lines leaking/broken)

So smoke test it and see?

GmoBmw · 04-01-2013, 10:28 AM

Quote:

Originally Posted by TexE90

So smoke test it and see?

Yes

marv85 · 04-01-2013, 10:34 AM

Quote:

Originally Posted by TexE90

So smoke test it and see?

That would be step 1. if that test is negative i.e no leak, then you start looking at your vacuum lines, canisters etc... if there is nothing there, then you change your boost solenoids (or borrow two from a friend and test them...). I had an issue where my car underboost after 5000rpm , it turned out to be the boost solenoids.

TexE90 · 04-01-2013, 10:47 AM

Great, thanks for the info guys!

Jeff@TopGearSolutions · 04-01-2013, 11:34 AM

Smoke tests really dont work on boosted cars. There is no pressure. You need atleast 15-20 PSI of pressure for a smoke test to work.

Check connections and hoses for Vac/boost lines, intercooler and charge pipe.

TexE90 · 04-01-2013, 02:11 PM

Just bought a gauge so I can go through this checklist to verify the integrity of the hot side:
http://www.n54tech.com/forums/showthread.php?t=13114

Hopefully I find the leak that way... My guess is the hoses are fine but the solenoids aren't working

marv85 · 04-01-2013, 04:12 PM

Quote:

Originally Posted by TexE90

Just bought a gauge so I can go through this checklist to verify the integrity of the hot side:
http://www.n54tech.com/forums/showthread.php?t=13114

Hopefully I find the leak that way... My guess is the hoses are fine but the solenoids aren't working

My guess would be boost control as well based on your description

TexE90 · 04-01-2013, 04:51 PM

Boost control as in? The solenoids?

TexE90 · 04-01-2013, 09:03 PM

I think I found the issue... The little 2" pipe connecting the wastegate side of the solenoid to the T connector was barely on. It has a ~0.5" crack up the side of it. I could flick it on and off the solenoid with one finger.

Hopefully that's the only issue and I can escape this repair with $5 in damage.

04-01-2013, 10:19 AM	#1
TexE90 Banned 10 Rep 134 Posts Drives: 2007 335i E90 Join Date: Nov 2012 Location: United States iTrader: (1)	JB4 Map 5 or 1 = 30FF, Map 4 = no issue Running Map 5 or map 1 on my JB4 gives me a 30FF WOT. I gun it, psi builds to ~10-12 psi, car shifts gears, psi drains until it drops below 5 psi at which point the 30FF code is thrown. Map 4... I gun it, psi builds to 8-9psi, car shifts, psi drains but stays just north of 5psi. No code is thrown. My car is stock except for JB4 and DCI - '07 e90. My turbos were replaced ~3k miles ago so I can't imagine they are already struggling. I've tried to listen for the "tornado siren" sound but all I hear is the whistle of the DCI. Is there anything else I should be on the lookout for? Will a smoke test show anything since psi goes away after gear shift only? I'm not sure when my plugs were last changed - could it be that? No SES is thrown. At a loss on this one... Any help is appreciated.
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04-01-2013, 10:20 AM	#2
marv85 Colonel 70 Rep 2,626 Posts Drives: '07 E92 335i MT Join Date: Jun 2010 Location: Bay Area iTrader: (7)	boost leak, boost control issue (boost solenoids, vacuum lines leaking/broken) __________________ '07 E92 335i 6MT- HP650, inlets/outlets, ER FMIC, VRSF CP, LPFP stg2, CSF rad, 'is Aux rad, ER OC, Ohlins, M control arms, eibach front sway bar. '05 C55 AMG SOLD - '22 Tesla M3P \| '10 E92 335i M, 6MT COBB, FBO, st2 LPFP, Mfactory LSD \| '07 E90 335i, PTF COBB E50, FBO, HFS4
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04-01-2013, 10:47 AM	#6
TexE90 Banned 10 Rep 134 Posts Drives: 2007 335i E90 Join Date: Nov 2012 Location: United States iTrader: (1)	Great, thanks for the info guys!
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04-01-2013, 11:34 AM	#7
Jeff@TopGearSolutions 3441 Rep 79,212 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	Smoke tests really dont work on boosted cars. There is no pressure. You need atleast 15-20 PSI of pressure for a smoke test to work. Check connections and hoses for Vac/boost lines, intercooler and charge pipe.
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04-01-2013, 02:11 PM	#8
TexE90 Banned 10 Rep 134 Posts Drives: 2007 335i E90 Join Date: Nov 2012 Location: United States iTrader: (1)	Just bought a gauge so I can go through this checklist to verify the integrity of the hot side: http://www.n54tech.com/forums/showthread.php?t=13114 Hopefully I find the leak that way... My guess is the hoses are fine but the solenoids aren't working Last edited by TexE90; 04-01-2013 at 03:05 PM..
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04-01-2013, 04:51 PM	#10
TexE90 Banned 10 Rep 134 Posts Drives: 2007 335i E90 Join Date: Nov 2012 Location: United States iTrader: (1)	Boost control as in? The solenoids?
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04-01-2013, 09:03 PM	#11
TexE90 Banned 10 Rep 134 Posts Drives: 2007 335i E90 Join Date: Nov 2012 Location: United States iTrader: (1)	I think I found the issue... The little 2" pipe connecting the wastegate side of the solenoid to the T connector was barely on. It has a ~0.5" crack up the side of it. I could flick it on and off the solenoid with one finger. Hopefully that's the only issue and I can escape this repair with $5 in damage.
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