No boost, wastegates open! Please help

ssphil · 06-03-2017, 09:53 AM

Hello everyone,

Yesterday, my wastegates became full open (I can tell from the exhaust sound) and I have absolutely no boost at all. I already had this happen last year and it was the vacuum line to the front wastegate actuator that was disconnected. I do have vacuum in the lines, I inspected every lines except for the one going to the rear WG actuator (it is connected to the actuator but could not remove it to check for leaks).

What's really weird is that I do not have any codes (No 30ff, nothing)

I do not have the vacuum canisters anymore (haven't had them for over a year now).

I bypassed the boost solenoids by connecting the lines from the pump directly to the lines to the actuators.... still nothing,

This is the worst timing because this morning is the Eurokracy festival and I was supposed to track the car. Oh Well

Any input would be appreciated! Thanks!

mojobmw_e90 · 06-03-2017, 10:10 AM

Why can't u check the rear wga nipple to see if the hose is on? If I reach down u can feel the nipple with your hands and should be able to put the hose on if it's not on

Donutz · 06-03-2017, 12:58 PM

When my intercooler coupler popped off I couldn't make boost and I also had no codes. Are you sure it's the wastegate? Can you manually move the wastegate to see if it can actually move?

ssphil · 06-03-2017, 01:15 PM

I was able to check that the rear hose is on the nipple from the bottom (no place from the top because of the inlets) and it is on. I was also able to move the rod from the rear actuator by hand and it's not seized. I am not able to reach my hand fat enough to remove the hose from the nipple.

It must be something related to the wastegates because the exhaust is LOUD. Much louder than usual.

Faredo · 06-03-2017, 03:26 PM

have you tried sucking on the hose to actuate the WGs?

ssphil · 06-03-2017, 08:04 PM

I just did and I think the rear actuator hose might be leaking... I replaced the hoses from the vacuum pump fittings to the boost solenoids and I am now able to get 10psi.

I can still hear at least 1 open wastegate and boost builds veeeeeery slowly so there must be another vacuum line that leaks so tonight I'll replace both WG actuator hoses. I will report back as soon as I am done.

I hope I won't have to remove the rear inlet as I have the relocated VRSF kit.

06-03-2017, 09:53 AM	#1
ssphil Private 13 Rep 54 Posts Drives: E90 335i & F10 550i Join Date: Jul 2015 Location: Quebec, Canada iTrader: (0) Garage List 2007 BMW 335i [10.00] 1995 BMW 530i [10.00]	No boost, wastegates open! Please help Hello everyone, Yesterday, my wastegates became full open (I can tell from the exhaust sound) and I have absolutely no boost at all. I already had this happen last year and it was the vacuum line to the front wastegate actuator that was disconnected. I do have vacuum in the lines, I inspected every lines except for the one going to the rear WG actuator (it is connected to the actuator but could not remove it to check for leaks). What's really weird is that I do not have any codes (No 30ff, nothing) I do not have the vacuum canisters anymore (haven't had them for over a year now). I bypassed the boost solenoids by connecting the lines from the pump directly to the lines to the actuators.... still nothing, This is the worst timing because this morning is the Eurokracy festival and I was supposed to track the car. Oh Well Any input would be appreciated! Thanks! __________________ Weekend Warrior: '07 E90 335i, JB, 6MT, DR 6266, Fuel-it stg3 lpfp, Helix, Prometh WMI, 7.5" ARM FMIC, JB4+MHD, Built engine Daily Driver: ‘16 F10 550i, SG, 8AT, JB4, ARM downpipes, XHP stg 3 trans tune Retired: '18 F30 340i '95 E34 530i, '99 E46 323i, '00 E46 323i
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06-03-2017, 10:10 AM	#2
mojobmw_e90 Major 382 Rep 1,497 Posts Drives: 2014 E63S Join Date: Oct 2014 Location: Chicago IL iTrader: (3)	Why can't u check the rear wga nipple to see if the hose is on? If I reach down u can feel the nipple with your hands and should be able to put the hose on if it's not on
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06-03-2017, 12:58 PM	#3
Donutz Lieutenant 140 Rep 476 Posts Drives: 335i Join Date: Sep 2015 Location: Toronto, eh iTrader: (2)	When my intercooler coupler popped off I couldn't make boost and I also had no codes. Are you sure it's the wastegate? Can you manually move the wastegate to see if it can actually move?
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06-03-2017, 01:15 PM	#4
ssphil Private 13 Rep 54 Posts Drives: E90 335i & F10 550i Join Date: Jul 2015 Location: Quebec, Canada iTrader: (0) Garage List 2007 BMW 335i [10.00] 1995 BMW 530i [10.00]	I was able to check that the rear hose is on the nipple from the bottom (no place from the top because of the inlets) and it is on. I was also able to move the rod from the rear actuator by hand and it's not seized. I am not able to reach my hand fat enough to remove the hose from the nipple. It must be something related to the wastegates because the exhaust is LOUD. Much louder than usual.
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06-03-2017, 03:26 PM	#5
Faredo Lieutenant 318 Rep 404 Posts Drives: 335i Join Date: Sep 2016 Location: Arkansas iTrader: (0)	have you tried sucking on the hose to actuate the WGs?
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06-03-2017, 08:04 PM	#6
ssphil Private 13 Rep 54 Posts Drives: E90 335i & F10 550i Join Date: Jul 2015 Location: Quebec, Canada iTrader: (0) Garage List 2007 BMW 335i [10.00] 1995 BMW 530i [10.00]	I just did and I think the rear actuator hose might be leaking... I replaced the hoses from the vacuum pump fittings to the boost solenoids and I am now able to get 10psi. I can still hear at least 1 open wastegate and boost builds veeeeeery slowly so there must be another vacuum line that leaks so tonight I'll replace both WG actuator hoses. I will report back as soon as I am done. I hope I won't have to remove the rear inlet as I have the relocated VRSF kit.
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