PCV ?....is it hidden?

kimiraikkonen · 01-31-2017, 01:36 PM

Hi. Am in the process of changing my TA and currently have the plenum off. Since I"m in there, figured I'd change out my PCV valve. However, I can't seem to locate it. If I start tracing back from the oil return hose (the one that connects to the intake)...it disappears around cylinder 5-6 ..

Is the PCV way in the back of the engine? Anyone change it before? Thx.

kimiraikkonen · 01-31-2017, 05:48 PM

bump....anyone? about to button up the plenum and wanted to see if I can replace since i'm already there.

Mr. BMW · 01-31-2017, 06:16 PM

Quote:

Originally Posted by kimiraikkonen

bump....anyone? about to button up the plenum and wanted to see if I can replace since i'm already there.

I didn't know modern cars still had these. I would think you would see it sticking out of the valve cover like they did back in the day..

kimiraikkonen · 01-31-2017, 11:13 PM

Quote:

Originally Posted by Mr. BMW

I didn't know modern cars still had these. I would think you would see it sticking out of the valve cover like they did back in the day..

https://www.ecstuning.com/b-genuine-...e/11617836553/

The crankcase return hose connects to this and the other end connects to the air intake plenum in the front of the car. Problem is if I follow this hose to the back, I lose where it goes at seems to take a nose dive under the cabling near the throttle actuators.

JsL · 01-31-2017, 11:26 PM

Don't know if this helps, but it's item #2 in this diagram.

http://www.realoem.com/bmw/enUS/show...17#11617836553

kimiraikkonen · 01-31-2017, 11:31 PM

Quote:

Originally Posted by JsL

Don't know if this helps, but it's item #2 in this diagram.

http://www.realoem.com/bmw/enUS/show...17#11617836553

Thanks, but yes, I saw that when I ordered the part. The problem is it's probably embedded under the wiring harness under the plenum. I'm hoping someone's replaced their PCV and can provide some pointers on how best to get this out.

Agent-GHQ · 02-01-2017, 01:31 AM

What's your reason to replace the pcv?

kimiraikkonen · 02-01-2017, 02:17 AM

Quote:

Originally Posted by Agent-GHQ

What's your reason to replace the pcv?

My car hit 100K mi recently and just did my spark plugs, oil separators, and one of the TA. Figured I hit the PCV (crankcase valve) as well to see if oil consumption can improve. Currently 1500 mi/L.

fred340 · 02-01-2017, 08:54 AM

It not a conventional pcv valve system on the s65: it's a baffle type system in the valve cover that separate the oil vapors and oil droplets.

kimiraikkonen · 02-01-2017, 11:40 AM

Quote:

Originally Posted by fred340

It not a conventional pcv valve system on the s65: it's a baffle type system in the valve cover that separate the oil vapors and oil droplets.

Hi. Sorry, but I think you are incorrect on this. The baffles are the Oil Separators (qty 2 that we have near Cyl 3-4 and 7-8). -> See the Orange boxes in the picture.

What I'm referring to is the Crankcase Valve. ECS Tuning calls it the PCV but it might be just a breather valve. Sorry I don't have a better pic on me, but on the pic below, the ventilation hose (one circled in yellow) is where it starts (connection to the plenum).

The problem I'm having is I lose where the hose goes as it gets back into the engine block. Am trying to get better info on where the ultimate connection is on the valve to the block (before I randomly start tearing back stuff).

https://www.ecstuning.com/b-genuine-...e/11617836553/ (Pcv valve)

https://www.ecstuning.com/b-genuine-...e/11617838288/ (Crankcase vent hose that connects to the PCV)

Jobe. · 02-01-2017, 12:05 PM

The PCV valve is located on the back side of the engine just behind bank 2 cylinder head.

kimiraikkonen · 02-01-2017, 12:08 PM

Quote:

Originally Posted by Jobe.

The PCV valve is located on the back side of the engine just behind bank 2 cylinder head.

Thanks Jobe. Can I access it from the engine bay or does the engine need to be lifted to gain access?

Jobe. · 02-01-2017, 02:44 PM

Quote:

Originally Posted by kimiraikkonen

Thanks Jobe. Can I access it from the engine bay or does the engine need to be lifted to gain access?

Without removing several components from the top/back of the engine you wouldn't be able to get to it. If I remember correctly you would need to remove the engine wiring harness on that side plus the egr hose. It might be accessible from the bottom, but it would be tough considering it is on the topside of the transmission housing.

dparm · 02-01-2017, 03:04 PM

Quote:

Originally Posted by Agent-GHQ

What's your reason to replace the pcv?

Depending on the specific design, they eventually wear out. See below photo for a simple explanation.

Obviously, the spring is fatigued over time and doesn't rebound correctly (or at all). The diaphragm can also get jammed or so dirty that it doesn't move enough.

fred340 · 02-01-2017, 03:27 PM

The n65 engine does not have a typical pcv valve: the sytem uses two oil seperators where the valve covers and intake meet. Oil accumulated after this process in the intake goes through the front bottom of the intake and then through the tube discuss before on this topic. After there is a oil drain back valve that brings back the oil in the crankcase.

hpapad01 · 02-01-2017, 03:46 PM

Quote:

Originally Posted by Jobe.

Without removing several components from the top/back of the engine you wouldn't be able to get to it. If I remember correctly you would need to remove the engine wiring harness on that side plus the egr hose. It might be accessible from the bottom, but it would be tough considering it is on the topside of the transmission housing.

Ha,ha, OP it would be easier to just replace the entire engine...

kimiraikkonen · 02-01-2017, 07:00 PM

Quote:

Originally Posted by Jobe.

Without removing several components from the top/back of the engine you wouldn't be able to get to it. If I remember correctly you would need to remove the engine wiring harness on that side plus the egr hose. It might be accessible from the bottom, but it would be tough considering it is on the topside of the transmission housing.

Jobe. Ouch, it looks like it's way back here (see yellow box below)??

Bavarian Beast · 02-02-2017, 12:37 AM

That MUST be about a 10 minute job......dang!

Jobe. · 02-02-2017, 09:00 AM

That is it...

kimiraikkonen · 02-02-2017, 03:49 PM

Quote:

Originally Posted by Jobe.

That is it...

Ouch. Looks like it's sitting on top of the EGR valve. Anyone do a DIY on EGR removal? Is it even possible from inside the engine bay?

bigjae1976 · 02-04-2017, 10:28 AM

That's definitely a recipe for some cuss words and scraped arms!

Cheylese · 07-08-2018, 04:52 PM

Is there only one PCV valve for the 2008 V8 E92?

01-31-2017, 01:36 PM	#1
kimiraikkonen Lieutenant 275 Rep 465 Posts Drives: 2008 E90 M3 6MT Join Date: Jun 2016 Location: San Francisco iTrader: (2)	PCV ?....is it hidden? Hi. Am in the process of changing my TA and currently have the plenum off. Since I"m in there, figured I'd change out my PCV valve. However, I can't seem to locate it. If I start tracing back from the oil return hose (the one that connects to the intake)...it disappears around cylinder 5-6 .. Is the PCV way in the back of the engine? Anyone change it before? Thx.
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01-31-2017, 11:26 PM	#5
JsL Major 448 Rep 1,263 Posts Drives: 2011 AW M3 ZCP Join Date: Dec 2013 Location: SF Bay Area iTrader: (2)	Don't know if this helps, but it's item #2 in this diagram. http://www.realoem.com/bmw/enUS/show...17#11617836553
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02-01-2017, 01:31 AM	#7
Agent-GHQ Captain 107 Rep 837 Posts Drives: '13 AW ///M3 E92 MT Comp Pkg Join Date: Jul 2009 Location: San Diego, CA iTrader: (0)	What's your reason to replace the pcv?
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02-01-2017, 08:54 AM	#9
fred340 Private 80 Rep 62 Posts Drives: E90 M3&328 Join Date: Mar 2013 Location: montreal, qc iTrader: (0)	It not a conventional pcv valve system on the s65: it's a baffle type system in the valve cover that separate the oil vapors and oil droplets. Last edited by fred340; 02-01-2017 at 09:01 AM..
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02-01-2017, 03:27 PM	#15
fred340 Private 80 Rep 62 Posts Drives: E90 M3&328 Join Date: Mar 2013 Location: montreal, qc iTrader: (0)	The n65 engine does not have a typical pcv valve: the sytem uses two oil seperators where the valve covers and intake meet. Oil accumulated after this process in the intake goes through the front bottom of the intake and then through the tube discuss before on this topic. After there is a oil drain back valve that brings back the oil in the crankcase.
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01-31-2017, 05:48 PM	#2
kimiraikkonen Lieutenant 275 Rep 465 Posts Drives: 2008 E90 M3 6MT Join Date: Jun 2016 Location: San Francisco iTrader: (2)	bump....anyone? about to button up the plenum and wanted to see if I can replace since i'm already there.
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02-01-2017, 12:05 PM	#11
Jobe. Second Lieutenant 99 Rep 252 Posts Drives: BMW M3 Join Date: Oct 2015 Location: Huntsville iTrader: (7)	The PCV valve is located on the back side of the engine just behind bank 2 cylinder head.
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02-02-2017, 12:37 AM	#18
Bavarian Beast Too many wagons on the bahn..... 98 Rep 582 Posts Drives: LMB 2011 BMW e93 Join Date: Feb 2013 Location: Hawaii iTrader: (1)	That MUST be about a 10 minute job......dang!
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02-02-2017, 09:00 AM	#19
Jobe. Second Lieutenant 99 Rep 252 Posts Drives: BMW M3 Join Date: Oct 2015 Location: Huntsville iTrader: (7)	That is it...
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02-04-2017, 10:28 AM	#21
bigjae1976 Major General 1570 Rep 8,075 Posts Drives: 11 E90 M3 Individual Join Date: Mar 2006 Location: Houston, TX iTrader: (22) Garage List 2004 BMW M3 [4.50] 2011 BMW E90 M3 [5.25] 2013 BMW 328i [5.00]	That's definitely a recipe for some cuss words and scraped arms! __________________ 2018 F30 320iX Melbourne Red 2011 E90 M3 Monte Carlo Blue 2004 E46 M3 Imola Red 2000 E36/7 Z3 Steel Blue
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07-08-2018, 04:52 PM	#22
Cheylese Registered 0 Rep 1 Posts Drives: 2008 BMW M3 E92 Join Date: Jul 2018 Location: KS iTrader: (0)	Is there only one PCV valve for the 2008 V8 E92?
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