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  #49  
Old 05-22-2014, 11:13 PM
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Quote:
Originally Posted by Zybane View Post
Not sure why I constantly get this PCV disconnected CEL.
Out of curiosity, did you ever try running the system with the same hoses but with the Provent removed? I'm planning to install a Provent this summer and based on your experience I'm already planning to use larger diameter hoses and as few couplers as possible in order to keep the pressure drop to a minimum.
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  #50  
Old 05-23-2014, 12:24 PM
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Question Re: PCV line / Oil Catch can

Now I get the advantages of a catch can especially in our CRDs, but if adding one causes as many problems as Zybane is having it seems to be more trouble than it's worth. Is there a catch can that is more reliable than the Pro-Vent in the GC? I guess the Pro-Vent is the most effective, but I'd rather have something that works all the time and doesn't throw CELs. Or are those not effective enough to be worth the effort?
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  #51  
Old 05-23-2014, 04:12 PM
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Re: PCV line / Oil Catch can

From Zybane:
Quote:
Not sure why I constantly get this PCV disconnected CEL. Does anyone know what exactly that sensor is measuring on the intake tube that the PCV exhaust goes through? There is a chap down in the export forum in Australia that has the Pro-Vent with his diesel and doesn't get a CEL. Then again, they have different emissions systems on their diesels. So strange this issue...
In my opinion it would have to be restriction, causing an increase in pressure.
I suspect that with the tight turns and reducers, there is enough flow restriction to cause the messages. I would also suspect that you will need to replumb it somehow avoiding such tight turns and therefore avoid crankcase pressure buildup which would be causing the error messages.
Maybe the answer is having the catch can further away if necessary, with lower radius turns on the pipe and avoiding any reducers and/or 90 degree bends completely if possible.
Having said that, I'm sure a catch can is a very good idea. I will certainly be looking into fitting one, and the Provent seems the pick of the bunch. I regularly hear absolute horror stories on all makes about crud build up on turbos and inlet manifolds- a combination of oil residue and hot EGR gas cooking it all.

Good luck
David.
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  #52  
Old 05-25-2014, 05:21 AM
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Re: PCV line / Oil Catch can

Quote:
Originally Posted by Futuresystem View Post
From Zybane:


In my opinion it would have to be restriction, causing an increase in pressure.
I suspect that with the tight turns and reducers, there is enough flow restriction to cause the messages. I would also suspect that you will need to replumb it somehow avoiding such tight turns and therefore avoid crankcase pressure buildup which would be causing the error messages.
Maybe the answer is having the catch can further away if necessary, with lower radius turns on the pipe and avoiding any reducers and/or 90 degree bends completely if possible.
I think this is probably the cause. I am running a Provent with no issues but I am using 1" inner diameter silicone tube throughout with no reducers etc. My Provent is also installed lower in the engine bay and sits under the a/c line which might help.
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  #53  
Old 05-26-2014, 09:59 AM
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Re: PCV line / Oil Catch can

Quote:
Originally Posted by Futuresystem View Post
From Zybane:


In my opinion it would have to be restriction, causing an increase in pressure.
I suspect that with the tight turns and reducers, there is enough flow restriction to cause the messages. I would also suspect that you will need to replumb it somehow avoiding such tight turns and therefore avoid crankcase pressure buildup which would be causing the error messages.
Maybe the answer is having the catch can further away if necessary, with lower radius turns on the pipe and avoiding any reducers and/or 90 degree bends completely if possible.
Having said that, I'm sure a catch can is a very good idea. I will certainly be looking into fitting one, and the Provent seems the pick of the bunch. I regularly hear absolute horror stories on all makes about crud build up on turbos and inlet manifolds- a combination of oil residue and hot EGR gas cooking it all.

Good luck
David.
Quote:
Originally Posted by Roachy View Post
I think this is probably the cause. I am running a Provent with no issues but I am using 1" inner diameter silicone tube throughout with no reducers etc. My Provent is also installed lower in the engine bay and sits under the a/c line which might help.
Hey guys, a few things. The error code is that the PCV system is "disconnected". It reading a disconnect would appear that it is venting to atmosphere, so the pressure is lower, not higher. There is also a sensor on the front of the PCV air pump housing that AUS cars don't have, so that may be another issue.

The sensor that takes in the venting from the PCV at the air intake tube is quite strange. It has a strange rounded shape with the bottom squared off, and is light orange in color. I can't see any visible metering devices in there, not sure how that sensor works.

As for the 1" hose all the way, not sure how that is possible? The PCV air pump outlet is 5/8th inch, and the air intake tube inlet is 7/8's inch. Both the Provent ports are 1", so to connect to the vehicle there has to be reducers/couple-rs in there somewhere.

Strangely, after resetting the code I think I've noticed that the CEL for the PCV system always triggers on acceleration. Weather that is coincidence or not, I will have to follow up on.
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  #54  
Old 05-30-2014, 08:53 PM
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Re: PCV line / Oil Catch can

The error code "disconnected" might still be a red herring I think.
I fail to see how the (crankcase) pressure could be lower- it's just not possible to add extra plumbing and reduce resistance to flow.

Disconnecting the PCV line at the source (at the end of the camshaft) would indeed reduce pressure where it joins the intake, thereby no doubt causing such a message. I just can't imagine the error messages being caused by anything other than a restriction of flow.

My opinion anyway.
I'm very convinced that fitting a catch can is a very good idea- I will be doing so as soon as I have a chance.

(2,100 klms on the clock and we love our Jeep GC diesel)

Cheers
David
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  #55  
Old 05-30-2014, 11:55 PM
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Quote:
Originally Posted by Futuresystem View Post
I just can't imagine the error messages being caused by anything other than a restriction of flow.
That's what I assumed as well. "Disconnected" meaning "I'm sensing a lower pressure than I expect". The catch can, the hosing, and the couplers all introduce additional resistance to flow that will inescapably reduce the pressure at the end of the run.

All we can hope to do is to minimize the pressure drop by minimizing the flow resistance. Since the can is basically unmodifiable, that leaves hosing (diameter and length) and couplers as variables.

I haven't decided how to attack this project, but my initial strategy is to run hoses that are the diameter of the catch can's ports (which I understand to be larger than the stock hosing) and place the size change couplers as the very first and very last elements in the system.

Not much space in the engine compartment, so this may be tough to accomplish.
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Old 06-01-2014, 10:45 AM
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Re: PCV line / Oil Catch can

One issue I am running into is I have yet to find anyone running a ProVent200 on a US spec diesel. All the ones are AUS, and their PCV system doesn't have this "Extra" sensor that US models have. Honestly I think that is whats causing my CEL, the US cars are more aggressive at monitoring the PCV system due to our crazy emissions laws.

Having a "disconnected" PCV would be a huge pollution law breaker under US code, so I think they set up the PCV system super sensitive to disturbance.

The CEL doesn't appear to affect the engine operation in any way, just want to get rid of that dang light plus the fault is being logged. So for warranty they could be like "why did you drive around for such a long time with this CEL".

I may have to re-do the entire hose setup. If it still gives an error, I guess I will have to go with a different/smaller catch can and sell the Provent.
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Old 06-03-2014, 04:30 PM
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Re: PCV line / Oil Catch can

I have just spent a little time this afternoon reviewing the catch can idea. I'm not so sure I would jump to the conclusion that the disconnected PCV code implies an open tube. Disconnected with the PCV plugged could easily be what they mean, we don't know for sure. Plugging it would be very bad for the engine as we probably all know. Increased crank case pressures would equal all sorts of problems. Either way, plugged or open to the environment, there are clear reasons for an error code I supposed.

The increased pressure thing triggering the fault code seems plausible to me. That is seems to occur during acceleration, when there would be increased crankcase pressure, may support this as well. It's also a common theme for the available catch cans to have too small inlet and outlet ports for what we need.

Anyway, just thought I'd throw that out there. I'm in agreement that there is a real need for one on this vehicle and am trying to figure out the best way to go, hopefully getting around the error code issues.
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Old 06-06-2014, 05:23 PM
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Re: PCV line / Oil Catch can

Ya, still playing around with it. The Provent 200 has huge 1" inlet and outlet's, should not be that restrictive (unless the paper element is). This may give the steel mesh type catch cans an edge as they should have very little pressure buildup vs a paper filter element. Although, the crankcase gases seem to be coming out the end of the tube that goes into the air intake track just fine.

I just bought a 1" elbow to plug in both sides of my tubing and eliminate the Provent and see if I still get the CEL.
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Old 06-07-2014, 06:12 AM
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PCV line / Oil Catch can

Try running it without the filter and see if it still throws the code, this will tell you if the problem is over or under pressure


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  #60  
Old 06-07-2014, 11:40 PM
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Re: PCV line / Oil Catch can

I just spliced in a 1" 90 degree elbow and eliminated the Provent in the circuit. Gonna drive it for a few days and see if I get the CEL.
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