N54Tech.com - International Turbo Racing Discussion
(#1)
Old
lituga lituga is offline
New Member
 
Posts: 24
Join Date: Nov 2018
Car: e61 535i xDrive
Default progressively worse then intermittent 30ff - 07-09-2020, 11:55 AM

hey all,

Got a weird issue here. Two out of three times I drive the car, I will only make 0-3psi of boost before throwing 30FF. However sometimes I can get in the car and easily get up to full boost which has me thinking there is a bad sensor or it's related to the wastegates. Would running an MHD tune with stock ********* eventually clog up an O2 sensor or ***? Is it possible there could be a failing injector? 30ff is the only code I have gotten and there aren't any obvious vacuum leaks...just replaced a few of them and the boost solenoids

Thanks!


'10 535xiT, 90k, dci, forge cp+bov, britalman muffler, extremecontact sports, stoptech slotted, mhd stg. 2
Reply With Quote
(#2)
Old
nhatnguyen14's Avatar
nhatnguyen14 nhatnguyen14 is offline
Junior Member
 
Posts: 46
Join Date: Aug 2019
Car: N54 E89
Default 07-09-2020, 02:08 PM

check your high pressure fuel pump. mine didn't throw any codes but wouldn't produce boost over 3 psi.
Reply With Quote
(#3)
Old
lituga lituga is offline
New Member
 
Posts: 24
Join Date: Nov 2018
Car: e61 535i xDrive
Default 07-11-2020, 01:57 PM

how would I check it? Please don't give me nightmares lol

An additional observation. 90% of the times it has worked are after I restart the engine for a second time after having just driven it the first time for 5 to 10 minutes. usually hitting 30ff after having no more than 3psi boost (feels like 0) i.e. the engine is warm. And then it is hitting FULL BOOST as usual when working. Idle seems just a bit louder and tiny bit rougher at around 900 to 1000 rpms before settling as usual to around 700rpm within a minute.

Could it be something like the exhaust is clogged creating backpressure for turbos? Leaky injector needing to clear out? I noticed some oil on spark plug #2 from front but I am hoping it leaked from the oil filler cap


'10 535xiT, 90k, dci, forge cp+bov, britalman muffler, extremecontact sports, stoptech slotted, mhd stg. 2
Reply With Quote
(#4)
Old
nhatnguyen14's Avatar
nhatnguyen14 nhatnguyen14 is offline
Junior Member
 
Posts: 46
Join Date: Aug 2019
Car: N54 E89
Default 07-11-2020, 02:38 PM

I have JB4 mobile app that reads the pressure. The parameter is FP_H. It's basically reading the pressure on the fuel rail sensor. I assume INPA can read it too.
Reply With Quote
(#5)
Old
nhatnguyen14's Avatar
nhatnguyen14 nhatnguyen14 is offline
Junior Member
 
Posts: 46
Join Date: Aug 2019
Car: N54 E89
Default 07-11-2020, 06:30 PM

Found this on the forum:

FP H: Fuel pressure, high system. Otherwise known as the high pressure pump. Note all N54 include this and other platforms can only log this if also equipped with the flex fuel connector. This value represents the voltage of the high pressure 0-5V sensor, where a value of 20 is 5v. Each unit of measure is roughly equal to 150psi. Typical values at full throttle are 10-14, or 1500 to 2100psi. Values of less than 900psi as full throttle indicate a fuel delivery problem and the JB4 will failsafe at 700psi at full throttle. Note when not at full throttle a typical value is 5 or 750psi.
Reply With Quote
(#6)
Old
lituga lituga is offline
New Member
 
Posts: 24
Join Date: Nov 2018
Car: e61 535i xDrive
Default *UPDATE* - 07-28-2020, 12:04 PM

so, about two weeks ago after driving the car hard for 15 minutes and putting some Jectron in, it felt like the wastegate was able to unstick and boost came back harder than ever! Things were great for about a week until now where I am at zero boost again. Acceleration from a stop isn't so bad but all passing maneuvers are over...feels like about 190whp.

the only codes I have seen are 30FF and more recently, a 30FC. The car drives very smoothly except for the very noticeable lack of boost );

I took some logs from today. Is it okay to keep driving the car around with wide open wastegates if that is what's happening?

Thanks!


'10 535xiT, 90k, dci, forge cp+bov, britalman muffler, extremecontact sports, stoptech slotted, mhd stg. 2
Reply With Quote
(#7)
Old
Bmw335turbo's Avatar
Bmw335turbo Bmw335turbo is offline
Junior Member
 
Posts: 119
Join Date: Dec 2019
Car: 335
Default 07-28-2020, 01:11 PM

Smoke test it.....


Reply With Quote
(#8)
Old
lituga lituga is offline
New Member
 
Posts: 24
Join Date: Nov 2018
Car: e61 535i xDrive
Default 07-30-2020, 08:16 AM

I did, nothing obvious besides the rear elbow leak at 10psi. I don't think a boost leak would explain going from zero to full boost all of a sudden. I'm wondering if anyone is able to figure out if it's a wastegate problem from the logs


'10 535xiT, 90k, dci, forge cp+bov, britalman muffler, extremecontact sports, stoptech slotted, mhd stg. 2
Reply With Quote
(#9)
Old
lituga lituga is offline
New Member
 
Posts: 24
Join Date: Nov 2018
Car: e61 535i xDrive
Default 08-13-2020, 04:26 PM

turns out that both of my wastegates are stuck open. I think the worsening 30ff through the year was from having one of them stick, which is why I could still make about 12 psi of boost (while target was 15psi). Now both are stuck open and that's why I got 0 boost. Solenoid values were all correct and functioning, but the actuators could no longer function. R.I.P. original turbos (as far as I know from 72k) 94k miles

the car still attempts to actuate the wastegates which is a slight groaning sound at the usual rpm when boost comes on around 2.5k rpm.

planning on going ******* *** and upgrading turbos


'10 535xiT, 90k, dci, forge cp+bov, britalman muffler, extremecontact sports, stoptech slotted, mhd stg. 2
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump




vBulletin Skin developed by: vBStyles.com
Copyright 2007 - 2020, N54tech.com