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      11-09-2018, 09:38 PM   #1
jandref321
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X5M Boost Leak Problems

Gents,

I've been slaving away for the past six months trying to find a solution to my boost leak codes but have failed miserably.

30FF: Boost Pressure control, Boost Pressure Too Low Fault
310B: Boost Pressure Control 2, Plausibility Fault
3108: Boost Pressure Control 2, Leakage Fault



Conditions: 3-5 gear, 60-80 mph or 110mph, Exactly 14 or 16 PSI, JB4 on or off.

They started in April. I am running Velos stage 2+ and JB4. I had the JB4 installed and running for a month before this started. Since then I have completed the following:

-Turbos and wastegates rebuilt
-All Vacuum Lines Replaced
-Both boost solenoids replaced
-Replaced TMAPs
-Replaced all charge pipe hoses and clamps (For the second time)
-Replaced Intake Manifold Vent lines and cross over line
-Vacuum Test of all vacuum lines, tanks, and wastegate actuators
-Attempted Pressure test but found a hole in my passenger intake elbow (BMW reinstalled the hose clamp backwards to avoid the DV+ and the clamp ate through the elbow) I have ordered a new elbow and used rubber cement/tape to hold it until the new one arrives.
-Took to an Indy shop and they politely asked me to leave and not come back.
-Checked JB4 wiring 3 times
-Checked DV valve resistance and energized with 9volt to hear clicking

I am also running Go Fast Bit's Diverter Valve upgrade. I thought maybe they were not operating properly so I went back to stock DV and found that I could barely build boost and felt like limp mode. I switched back to DV+ and I can build boost but it dumps and throws a code at 16psi like before.

The stock diverter valves worked perfectly fine before I upgraded them and the diaphragms are in excellent condition. The DV+ has a heavy spring that holds the piston closed even when the solenoids are open. The Spring only allows the piston to open when enough boost is applied.


Considering this I think that the diverter valve solenoids are:

1) Failing open, but not throwing code until DV+ spring opens
2) Opening as soon as the engine turns on, but not throwing code until DV+ spring opens
3) Being actuated open by the computer erroneously, but not throwing code until DV+ spring opens

From some research and observation it seems that the DVs only open when energized and would fail closed. This leads me to believe that the issue could be software. Still leaving the other options open, and aside from the link to the DV, here are my thoughts on options:

1) Remove JB4
2) Replace DV solenoids
3) Replace Chargepipe
4) Replace Vacuum Pump

I have spent a behind load of money and time on this so far and not eager to keep working on it. JB4 with BCM is a PITA to remove/install on N63/S63. DV solenoids are like $60 each before shipping. Charge pipe is $450 or would need to spend a lot on a fabricator. Vacuum pump isn't that expensive but PITA to mess with.

Thoughts? Any extra tests you can think of?
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2017 F30 330e CURRENT M Sport Package, M Performance Decals
2012 E70 X5M CURRENT Stg 1+ Turbos, DPs, Velos Stg 2+, JB4, Race Cats, Bavauto Coils
2011 F10 535i SOLD Burger Tuning JB4, BMS CAI
2003 E46 M3 SOLD aFe CAI, AP Axleback, SSK, H&R Springs, TMS CMBR Arms, PF RTABs

Last edited by jandref321; 11-09-2018 at 10:09 PM.
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      11-10-2018, 12:34 AM   #2
greddy91
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How quickly is it building boost? Could the rebuilt wastegate be stuck open or not be fully closing perhaps? Turbo blankets in play that could be causing an obstruction?
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      11-10-2018, 12:50 AM   #3
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It builds boost very quickly with the DV+ on...just dumps it abruptly at 16psi and I get the codes. Stock DV it still builds boost but very slowly and it feels slow.

I had turbo blankets before the rebuild but tossed them. The wastegates shouldnt be an issue at all. I tested them with a vacuum pump and they were free moving and completely closed at 12 psi.
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      11-10-2018, 10:00 AM   #4
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Quote:
Originally Posted by jandref321 View Post
It builds boost very quickly with the DV+ on...just dumps it abruptly at 16psi and I get the codes. Stock DV it still builds boost but very slowly and it feels slow.

I had turbo blankets before the rebuild but tossed them. The wastegates shouldnt be an issue at all. I tested them with a vacuum pump and they were free moving and completely closed at 12 psi.
Could one of your boost pressure sensors be bad? After I tuned my car, I had one go bad and was chasing around the problem as well. I had a different code 29E1...
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      11-10-2018, 12:18 PM   #5
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Quote:
Originally Posted by 9vapors View Post
Could one of your boost pressure sensors be bad? After I tuned my car, I had one go bad and was chasing around the problem as well. I had a different code 29E1...
I already replaced the TMAPs in the intercoolers ...are you referring to the intake manifold sensors?
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      11-10-2018, 02:17 PM   #6
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Quote:
Originally Posted by jandref321 View Post
Quote:
Originally Posted by 9vapors View Post
Could one of your boost pressure sensors be bad? After I tuned my car, I had one go bad and was chasing around the problem as well. I had a different code 29E1...
I already replaced the TMAPs in the intercoolers ...are you referring to the intake manifold sensors?
I was referring to the ones in the intercoolers...
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      11-10-2018, 03:35 PM   #7
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I just removed the JB4 and the codes persist. Next step is replace the DV solenoids I guess
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      Yesterday, 01:24 PM   #8
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Quote:
Originally Posted by jandref321 View Post
I just removed the JB4 and the codes persist. Next step is replace the DV solenoids I guess
Man I wish I could help you, especially for all the help you've given the community... I hope you get it figured out soon, you've already spent a lot of time and $...
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      Today, 10:50 AM   #9
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I flashed the truck back to stock and no leak codes, but I'm not sure what boost I'm pushing. I downloaded the Torque app and using OBD2 wirelessly but it's not reading over 5 psi. The truck still feels like it's pushing more than 5 PSI so I think the app is inaccurate even though the vacuum is in the right range. The app did read 400 whp which should be around the stock 555bhp...obviously not a dyno, but just something else to consider.

Next step is reinstall the JB4 just to log and get an idea of how much boost I'm pushing. The codes were popping mainly around 16 psi, but occasionally around 14 psi so it could just be that the stock tune isn't reaching these levels and not throwing a code. Or the JB4 could have somehow corrupted the flash tune?

I'll try running stock with JB4 log then with JB4 Map 1 and then Map 6. If it's holding then it will be some issue with the flash tune and if not then it has got to be the charge pipes or DVs. I'd rather not buy a new plastic charge pipe that will bust again so I'll keep looking for a fabricator.
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2017 F30 330e CURRENT M Sport Package, M Performance Decals
2012 E70 X5M CURRENT Stg 1+ Turbos, DPs, Velos Stg 2+, JB4, Race Cats, Bavauto Coils
2011 F10 535i SOLD Burger Tuning JB4, BMS CAI
2003 E46 M3 SOLD aFe CAI, AP Axleback, SSK, H&R Springs, TMS CMBR Arms, PF RTABs
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