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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Evap leak n52



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      04-19-2018, 01:13 PM   #1
Shafin328i
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Evap leak n52

So after about 3 weeks of doing a 3 stage manifold swap I got a service engine soon light. The close gas cap light came on as well. I went to advance auto to scan the code and I got a P0442 code. Hoses everything seems fine to me. Car runs the same. Any ideas what may be the issue because of the manifold change or should I do a smoke test?
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      04-19-2018, 11:22 PM   #2
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Smoke test for leaks. If nothing, I'd suspect the DTML pump
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      04-22-2018, 08:25 PM   #3
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My car has had a 2a16 leak for a while, I replaced the DMTL pump and gas cap. It turned out to be the same tube as this post http://www.e90post.com/forums/showthread.php?t=991841

Picture shows my hand (blue glove top right) holding the tube away from the offending AC line (see linked post). P/N 13907530976

To get an idea of where this is located, itís basically below the intake, in the area made available by moving the power steering reservoir. You can see the steering shaft so that might help get you oriented.

I could feel the tubing worn down. I removed the air box to get the front end of this tube section unclipped. The tube section is about a foot long. The lower end is by the firewall, but I had to remove the underbody transmission shield and get under the car to get it clipped in on replacement.
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Last edited by djh2; 04-25-2018 at 04:26 PM.. Reason: smaller photo, with highlight
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      04-22-2018, 08:46 PM   #4
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Quote:
Originally Posted by djh2 View Post
My car has had a 2a16 leak for a while, I replaced the DMTL pump and gas cap. It turned out to be the same tube as this post http://www.e90post.com/forums/showthread.php?t=991841

Picture shows my hand (blue glove top right) holding the tube away from the offending AC line (see linked post).

To get an idea of where this is located, it’s basically below the intake, in the area made available by moving the power steering reservoir. You can see the steering column so that might help get you oriented.

I could feel the tubing worn down. I removed the air box to get the front end of this tube section unclipped. The tube section is about a foot long. The lower end is by the firewall, but I had to remove the underbody transmission shield and get under the car to get it clipped in on replacement.
Thank you for this! This might actually be my issue because I did move around the reservoir a lot and was a struggle to install my manifold. I'll take a look into it thanks again
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      04-23-2018, 09:11 AM   #5
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Interesting, so do you guys recommend adding the 1/2" pipe insulation to prevent this?

I assume you only need to remove the air intake box, or is better to do underneath the car?
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      04-23-2018, 06:04 PM   #6
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Quote:
Originally Posted by mecheng77 View Post
Interesting, so do you guys recommend adding the 1/2" pipe insulation to prevent this?

I assume you only need to remove the air intake box, or is better to do underneath the car?
Yes, PSA: your tube is wearing out!

I have 173K miles on my car, this issue came up in the fall.

You can check on this issue by moving the power steering fluid reservoir out-of-the-way. Thatís just two 10 mm nuts. Feel around for a flat spot worn by that metal connector on the AC hose.

If you end up needing to remove the section I would recommend removing the air filter box (on N52).

Was just able to remove the lower connector by the firewall from the power steering reservoir spot but it was a very tight space for my arm. I had to reattach it underneath which probably gives a lot more access for removal anyway.

Tools needed are 8mm and 10mm sockets/wrenches and the torx screw for the intake, T25 if I recall correctly
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      04-24-2018, 08:44 AM   #7
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Quote:
Originally Posted by djh2 View Post
Yes, PSA: your tube is wearing out!

I have 173K miles on my car, this issue came up in the fall.

You can check on this issue by moving the power steering fluid reservoir out-of-the-way. Thatís just two 10 mm nuts. Feel around for a flat spot worn by that metal connector on the AC hose.

If you end up needing to remove the section I would recommend removing the air filter box (on N52).

Was just able to remove the lower connector by the firewall from the power steering reservoir spot but it was a very tight space for my arm. I had to reattach it underneath which probably gives a lot more access for removal anyway.

Tools needed are 8mm and 10mm sockets/wrenches and the torx screw for the intake, T25 if I recall correctly
Thanks, yes it is easy to do, just move the PS reservoir. I put the insulation on the AC line instead but I might move it.

The corrugated line is a vacuum line? It looks like wiring loom?
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      04-25-2018, 04:24 PM   #8
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The corrugated line is part of the evap control system. Not exactly vacuum, but the DMTL pump pressurizes the system to check for leaks.

It doesn't look right on this diagram, but this is the part number:13907530976
http://www.realoem.com/bmw/enUS/show...34#13907530976

Looks like this: https://www.ecstuning.com/b-genuine-...e/13907530976/
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Last edited by djh2; 04-25-2018 at 04:34 PM..
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