Little turbo, no boost?

Dazza335iC · 08-10-2020, 04:41 PM

I stepped away from driving my 335d on a daily basis with this whole COVID thing, and the last time I drove it I noticed a distinct lack of torque below 3500rpm, almost like the little turbo isn't building boost. I logged road speed, engine speed, and before-correction boost pressure in iCarly but I'll be damned if I can figure out how to get to the log (anyone know how?). What are some things to look for? All vacuum lines are new, less than 10k miles. No codes, even stored/ghost codes. Everything looks perfect, no signs of boost leaks, oil leaks, etc. I'm not sure where to look next. Any ideas are appreciated!

335dlci · 08-10-2020, 06:06 PM

I have had my vac lines fail at 20k what kind did you use

Dazza335iC · 08-11-2020, 09:41 AM

OEM cloth-braided, made by Continental IIRC

335dlci · 08-11-2020, 12:43 PM

Quote:

Originally Posted by Dazza335iC

OEM cloth-braided, made by Continental IIRC

Yeah same shit i used

chau · 08-11-2020, 08:27 PM

Is the exhaust note louder? I know you said you don't have any codes but it could be the vacuum solenoid. Check this video, might help diagnose the issue

calebmoscufo · 08-31-2020, 08:50 PM

I had the same problem after i did egr race pipe. i did the job in the dark and left a vac line that comes off a harness disconnected. i plugged it later and now its a rocket again. so maybe check your lines in the vicinity of the egr cooler for leaks because its vital for small turbo actuator.

Definitely switch to silicone hoses asap.

e90Noobie · 09-15-2020, 02:12 PM

https://youtu.be/xmVBfOmpQho

08-10-2020, 04:41 PM	#1
Dazza335iC Second Lieutenant 54 Rep 215 Posts Drives: E39 M5, F15 35d Join Date: Nov 2014 Location: Portland, OR iTrader: (0) Garage List 2000 E39 M5 Dinan [0.00] 2017 X5 35d [0.00]	Little turbo, no boost? I stepped away from driving my 335d on a daily basis with this whole COVID thing, and the last time I drove it I noticed a distinct lack of torque below 3500rpm, almost like the little turbo isn't building boost. I logged road speed, engine speed, and before-correction boost pressure in iCarly but I'll be damned if I can figure out how to get to the log (anyone know how?). What are some things to look for? All vacuum lines are new, less than 10k miles. No codes, even stored/ghost codes. Everything looks perfect, no signs of boost leaks, oil leaks, etc. I'm not sure where to look next. Any ideas are appreciated!
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08-10-2020, 06:06 PM	#2
335dlci Lieutenant Colonel 277 Rep 1,574 Posts Drives: 335d Join Date: Apr 2014 Location: Socal iTrader: (0)	I have had my vac lines fail at 20k what kind did you use
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08-11-2020, 09:41 AM	#3
Dazza335iC Second Lieutenant 54 Rep 215 Posts Drives: E39 M5, F15 35d Join Date: Nov 2014 Location: Portland, OR iTrader: (0) Garage List 2000 E39 M5 Dinan [0.00] 2017 X5 35d [0.00]	OEM cloth-braided, made by Continental IIRC
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08-11-2020, 08:27 PM	#5
chau Second Lieutenant 28 Rep 234 Posts Drives: 335d Join Date: Mar 2013 Location: Philadelphia iTrader: (0)	Is the exhaust note louder? I know you said you don't have any codes but it could be the vacuum solenoid. Check this video, might help diagnose the issue
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08-31-2020, 08:50 PM	#6
calebmoscufo Registered 0 Rep 1 Posts Drives: bmw 335d Join Date: Aug 2020 Location: pensylvania iTrader: (0)	lp turbo no boost I had the same problem after i did egr race pipe. i did the job in the dark and left a vac line that comes off a harness disconnected. i plugged it later and now its a rocket again. so maybe check your lines in the vicinity of the egr cooler for leaks because its vital for small turbo actuator. Definitely switch to silicone hoses asap.
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09-15-2020, 02:12 PM	#7
e90Noobie Private First Class 16 Rep 137 Posts Drives: 335d Join Date: Aug 2018 Location: Nunya iTrader: (0)	https://youtu.be/xmVBfOmpQho
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