Where can turbo boost leak on e90 320D?

tadaska · 07-26-2022, 04:02 PM

I know the seals around the manifold could be letting some boost lose. But is there anywhere else? Like EGR blanking at the exhaust. Could the boost leak there?

tadaska · 07-30-2022, 02:49 PM

Do these have anything to do with turbo boost pressure?

https://www.google.com/search?q=1161...&bih=929&dpr=1

Silver Streek · 08-01-2022, 02:50 AM

It's usually the hoses, they can split which generally leaves an oily residue on the outside of the hoses where the split is. The connections at the intercooler can start to leak boost also. Sometimes the intercoolers themselves can leak boost if they crack etc.

tadaska · 08-01-2022, 09:36 AM

Quote:

Originally Posted by Silver Streek

It's usually the hoses, they can split which generally leaves an oily residue on the outside of the hoses where the split is. The connections at the intercooler can start to leak boost also. Sometimes the intercoolers themselves can leak boost if they crack etc.

Thx, next week I'm replacing the thermostat will have a look around and see if I can spot something. Is it a sign of a boost leak if there is no turbo kick at 2k rpm like it used to be. I do feel a bit of a kick at maybe 2.7k rpm but not much.

Silver Streek · 08-02-2022, 02:14 AM

Doesn't sound like a turbo leak to me, make the actuator on the turbo is sticking.

rasa bmw · 08-04-2022, 02:41 AM

pressure converter or vac lines

tadaska · 08-07-2022, 04:08 AM

This is my first turbo car and I'm clueless. Trying to search for info on the turbo actuator and pressure converter but almost no helpful info.

How do I approach this? I will be replacing the thermostat tomorrow morning and I think it's all around that area and I should have better access to see things?

But what do I look for? How do I check if the actuator is sticky? Where is the pressure converter? Is it a dedicated pressure converter for the turbo or is it some general converter somewhere? How do I check for vacuum line problems?

If anyone can pitch in to help regarding any of this it will be much appreciated.

TIA

J21J · 11-27-2022, 12:48 PM

If you can pressurise the system that would be best then you can hear air escaping.

The other thing to look at is your egr valve staying stuck open causing these symptoms.

07-26-2022, 04:02 PM	#1
tadaska Major 114 Rep 1,001 Posts Drives: 2006 E90 320D ES Join Date: May 2016 Location: Eastbourne iTrader: (0)	Where can turbo boost leak on e90 320D? I know the seals around the manifold could be letting some boost lose. But is there anywhere else? Like EGR blanking at the exhaust. Could the boost leak there?
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07-30-2022, 02:49 PM	#2
tadaska Major 114 Rep 1,001 Posts Drives: 2006 E90 320D ES Join Date: May 2016 Location: Eastbourne iTrader: (0)	Do these have anything to do with turbo boost pressure? https://www.google.com/search?q=1161...&bih=929&dpr=1
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08-01-2022, 02:50 AM	#3
Silver Streek Lieutenant 119 Rep 599 Posts Drives: 325d E91 Join Date: Feb 2018 Location: The Moon iTrader: (0)	It's usually the hoses, they can split which generally leaves an oily residue on the outside of the hoses where the split is. The connections at the intercooler can start to leak boost also. Sometimes the intercoolers themselves can leak boost if they crack etc.
	Appreciate 1 tadaska113.50 Quote

08-02-2022, 02:14 AM	#5
Silver Streek Lieutenant 119 Rep 599 Posts Drives: 325d E91 Join Date: Feb 2018 Location: The Moon iTrader: (0)	Doesn't sound like a turbo leak to me, make the actuator on the turbo is sticking.
	Appreciate 1 tadaska113.50 Quote

08-04-2022, 02:41 AM	#6
rasa bmw Colonel 243 Rep 2,026 Posts Drives: 640d sport/f31 330d x drive Join Date: Jul 2017 Location: northumberland iTrader: (0)	pressure converter or vac lines
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08-07-2022, 04:08 AM	#7
tadaska Major 114 Rep 1,001 Posts Drives: 2006 E90 320D ES Join Date: May 2016 Location: Eastbourne iTrader: (0)	This is my first turbo car and I'm clueless. Trying to search for info on the turbo actuator and pressure converter but almost no helpful info. How do I approach this? I will be replacing the thermostat tomorrow morning and I think it's all around that area and I should have better access to see things? But what do I look for? How do I check if the actuator is sticky? Where is the pressure converter? Is it a dedicated pressure converter for the turbo or is it some general converter somewhere? How do I check for vacuum line problems? If anyone can pitch in to help regarding any of this it will be much appreciated. TIA
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11-27-2022, 12:48 PM	#8
J21J Enlisted Member 3 Rep 32 Posts Drives: Bmw E90 Join Date: Jul 2021 Location: Scotland iTrader: (0)	If you can pressurise the system that would be best then you can hear air escaping. The other thing to look at is your egr valve staying stuck open causing these symptoms.
	Appreciate 0 Quote