Are there any vacuum lines that are more prone to leaking than others?

atropine · 07-26-2017, 02:04 PM

I embarked on my DPF/SCR/EGR delete process last night. I read and read and read on this forum and thanks to everyone's write-ups I was able to get the entire exhaust/DPF system out. I also got the intercooler and intake out. I have a headlight washer leak so I removed the bumper cover and doingnthatvat the same time. I ordered a bunch of new vacuum tubing to replace the OEM stuff since I already have everything apart. I read several of the great write-ups on this recently and I think I will be able to do this. I'm planning to replace every vacuum line I can reach/see. But I am wondering - with a tuned car, are there any particular vacuum lines that are the "most important" to replace? Any that are the most common to leak with a modified car?

dmanb2b · 07-26-2017, 02:13 PM

Replace them all. Go slow and use an exacto knife to relieve tension on the nipples before pulling hoses off.

To answer your question, the ones near turbo will look worst, but you might as well get them all while you have access, especially around the motor mounts

atropine · 07-26-2017, 02:52 PM

Will do. Speaking of motor mounts, why in the world do the motor mounts require a vacuum line? Do the dampeners get stiffer as vacuum is generated?

Torqu3 · 07-26-2017, 02:58 PM

Quote:

Originally Posted by atropine

Will do. Speaking of motor mounts, why in the world do the motor mounts require a vacuum line? Do the dampeners get stiffer as vacuum is generated?

That's exactly what happens.

atropine · 07-27-2017, 10:06 AM

I got all the vacuum lines replaced last night. All of them except the bottom half of the line that runs to the wastegate (at least I think that is what it is called). That line comes from the factory with a end/end connector halfway up the line so I just replaced the upper half. I don't see any way of getting the bottom half of that line off or back on without removing the turbos and other stuff, which is more than what I want to get into. The rest of the lines were a big enough pain. Have any of you guys replaced the bottom half of this line?

335dlci · 07-27-2017, 10:45 AM

Quote:

Originally Posted by atropine

I got all the vacuum lines replaced last night. All of them except the bottom half of the line that runs to the wastegate (at least I think that is what it is called). That line comes from the factory with a end/end connector halfway up the line so I just replaced the upper half. I don't see any way of getting the bottom half of that line off or back on without removing the turbos and other stuff, which is more than what I want to get into. The rest of the lines were a big enough pain. Have any of you guys replaced the bottom half of this line?

replaced them all actaully. including the ones you are speaking of. it does help to have a lift to do them because they are hidden behind the DPF>

Chief Orman · 07-27-2017, 11:32 AM

Quote:

Originally Posted by 335dlci

replaced them all actaully. including the ones you are speaking of. it does help to have a lift to do them because they are hidden behind the DPF>

Does having the DPF removed facilitate getting access the hardest to reach vacuum lines or is one still looking at taking off the turbos?

Yozh · 07-27-2017, 11:35 AM

You don't need to take the turbos out to change your vacuum lines.

Chief Orman · 07-27-2017, 12:35 PM

Quote:

Originally Posted by Yozh

You don't need to take the turbos out to change your vacuum lines.

Yozh how do you think it should take a reasonably competent mechanic to replace all the lines?

Torqu3 · 07-27-2017, 01:15 PM

Quote:

Originally Posted by Chief Orman

Yozh how do you think it should take a reasonably competent mechanic to replace all the lines?

Reasonably competent mechanic here. Had I not stripped my exhaust pressure sensor bolt and had to get a tow to the shop to fit, I could have done it in 4 hours.

Hockey13 · 07-27-2017, 02:48 PM

Quote:

Originally Posted by Chief Orman

Quote:

Originally Posted by Yozh

You don't need to take the turbos out to change your vacuum lines.

Yozh how do you think it should take a reasonably competent mechanic to replace all the lines?

I did a brief write up a while back. let me know if you can't find it.

Yozh · 07-27-2017, 03:31 PM

Quote:

Originally Posted by Chief Orman

Yozh how do you think it should take a reasonably competent mechanic to replace all the lines?

I would say 3-4 hours if they know what they are doing. That includes the engine mounts.

Torqu3 · 07-27-2017, 03:31 PM

Quote:

Originally Posted by Hockey13

I did a brief write up a while back. let me know if you can't find it.

I compiled a list of DIY threas for this very reason. Here's yours. http://www.e90post.com/forums/showthread.php?t=1255573

07-26-2017, 02:04 PM	#1
atropine Enlisted Member 7 Rep 40 Posts Drives: 2011 335d M-Sport with deletes Join Date: Aug 2016 Location: Logandale, NV iTrader: (0)	Are there any vacuum lines that are more prone to leaking than others? I embarked on my DPF/SCR/EGR delete process last night. I read and read and read on this forum and thanks to everyone's write-ups I was able to get the entire exhaust/DPF system out. I also got the intercooler and intake out. I have a headlight washer leak so I removed the bumper cover and doingnthatvat the same time. I ordered a bunch of new vacuum tubing to replace the OEM stuff since I already have everything apart. I read several of the great write-ups on this recently and I think I will be able to do this. I'm planning to replace every vacuum line I can reach/see. But I am wondering - with a tuned car, are there any particular vacuum lines that are the "most important" to replace? Any that are the most common to leak with a modified car?
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07-26-2017, 02:13 PM	#2
dmanb2b Banned 2125 Rep 3,368 Posts Drives: G07, F97, F30, E90, E46, E30 Join Date: Jul 2016 Location: NY iTrader: (5)	Replace them all. Go slow and use an exacto knife to relieve tension on the nipples before pulling hoses off. To answer your question, the ones near turbo will look worst, but you might as well get them all while you have access, especially around the motor mounts
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07-26-2017, 02:52 PM	#3
atropine Enlisted Member 7 Rep 40 Posts Drives: 2011 335d M-Sport with deletes Join Date: Aug 2016 Location: Logandale, NV iTrader: (0)	Will do. Speaking of motor mounts, why in the world do the motor mounts require a vacuum line? Do the dampeners get stiffer as vacuum is generated?
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07-27-2017, 10:06 AM	#5
atropine Enlisted Member 7 Rep 40 Posts Drives: 2011 335d M-Sport with deletes Join Date: Aug 2016 Location: Logandale, NV iTrader: (0)	I got all the vacuum lines replaced last night. All of them except the bottom half of the line that runs to the wastegate (at least I think that is what it is called). That line comes from the factory with a end/end connector halfway up the line so I just replaced the upper half. I don't see any way of getting the bottom half of that line off or back on without removing the turbos and other stuff, which is more than what I want to get into. The rest of the lines were a big enough pain. Have any of you guys replaced the bottom half of this line?
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07-27-2017, 11:35 AM	#8
Yozh Colonel 870 Rep 2,615 Posts Drives: 2011 335d M-Sport Join Date: Mar 2014 Location: Wet Coast iTrader: (4)	You don't need to take the turbos out to change your vacuum lines.
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