Help identifying hose on S54

E90PAT · 07-06-2019, 07:32 PM

What is the purpose of the electrical device between—what appears to be—the fuel line and tapping into the crank case hose?

vt100 · 07-06-2019, 11:37 PM

This is a crankcase breather valve, part of the PCV hose (11157834056). The metal pipe it's attached to is not a fuel rail but rather an idle regulation air line (13417834068).

Here is some explanation:
https://www.pelicanparts.com/techart...eplacement.htm

Vanne · 07-07-2019, 08:51 AM

Its emissions control. Pretty sure only US cars have this.

jdoublehcubed · 07-07-2019, 10:40 PM

Interesting note, if you leave that unplugged the car will start fine but run very rough. Seems like I fail to plug that in basically every time I do a valve adjustment.

07-06-2019, 07:32 PM	#1
E90PAT SOFLO CODING 199 Rep 3,587 Posts Drives: Z4M Join Date: Apr 2009 Location: SoFla iTrader: (18)	Help identifying hose on S54 What is the purpose of the electrical device between—what appears to be—the fuel line and tapping into the crank case hose? Attached Images
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07-06-2019, 11:37 PM	#2
vt100 Second Lieutenant 126 Rep 264 Posts Drives: '06 Z4MC, '12 128i Join Date: Apr 2019 Location: SFO iTrader: (0)	This is a crankcase breather valve, part of the PCV hose (11157834056). The metal pipe it's attached to is not a fuel rail but rather an idle regulation air line (13417834068). Here is some explanation: https://www.pelicanparts.com/techart...eplacement.htm
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07-07-2019, 08:51 AM	#3
Vanne Down Under!! 1621 Rep 4,294 Posts Drives: 2007 Z4MC Join Date: Mar 2013 Location: Dubai iTrader: (4)	Its emissions control. Pretty sure only US cars have this. __________________ 2007 EuroSpec Z4///MC - Building/Developing Z4 GT3 Powered by
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07-07-2019, 10:40 PM	#4
jdoublehcubed Mechanical Engineer 96 Rep 1,025 Posts Drives: 2006 Z4MR, Imola Red Join Date: Jul 2012 Location: Anaheim, CA iTrader: (1)	Interesting note, if you leave that unplugged the car will start fine but run very rough. Seems like I fail to plug that in basically every time I do a valve adjustment.
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