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Old 02-03-2015, 01:08 AM
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Any way to block the EGR?

I've just temporarily removed the EGR pipe on my 2014 3 Litre diesel GC, and am a bit shocked at the amount of black crud in the inlet manifold already.

I don't s'pose anybody has worked out a way of blocking the EGR?

I assume a blocking plate would just cause fault codes.

Any know how on this?

Thanks

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  #2  
Old 02-04-2015, 09:13 PM
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Re: Any way to block the EGR?

Could you take some pictures? What's the age/mileage?

We need to help this EcoDiesel breathe easier
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Old 02-04-2015, 11:24 PM
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Re: Any way to block the EGR?

Quote:
Could you take some pictures? What's the age/mileage?

We need to help this EcoDiesel breathe easier
Hope this answers your question:
Unfortunately I didn't take photos before thoroughly cleaning the pipe, and doubt I could get photos inside the manifold- though I will try. When you poke your finger in and wipe what you can reach, your finger gets completely covered in the sticky black gunk, not good.

Suffice to say it's an oily, jet black, sooty build up, not thick enough to cause any significant restriction YET, but my GC diesel has only about 6,500 klms (not miles!) on the odo. (It's only nine months since delivery, was built in Jan14.)
I hate to think what it will be like at 60,000, or 160,000 klms.
It's not driven a lot as a daily as I have a separate work vehicle, but then we take it on big trips, towing a 3T caravan.

Glad I have the catch can on the PCV vent pipe though, that must help a little.
It was fitted at something like 3,000klms.

Cya
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Old 02-04-2015, 11:59 PM
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Perhaps I'm mistaken, but isn't the integrated air/oil separator *post* intake? If so, doesn't that imply that it's really hard to estimate how much of that buildup is making it to, say, the turbo?

Please correct me if I'm wrong.
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Old 02-05-2015, 01:33 AM
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Re: Any way to block the EGR?

There are rumors of an aftermarket tune that will turn off the EGR so you won't have to mess with it mechanically like putting in a block-off kit.
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Old 02-05-2015, 08:33 AM
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Re: Any way to block the EGR?

Quote:
Originally Posted by Roadkill View Post
Perhaps I'm mistaken, but isn't the integrated air/oil separator *post* intake? If so, doesn't that imply that it's really hard to estimate how much of that buildup is making it to, say, the turbo?

Please correct me if I'm wrong.
Not sure I understand your claim. Oil separators are part of the crankcase ventilation system so they can't be pre or post intake (they are not in the intake path). Our CRD has a centrifugal oil separator. It is located on the left front engine cover. Crankcase blow-by gases feed off the crankcase into the separator that is driven by the left camshaft. The rotating centrifuge separates the oil droplets that drizzle across machined baffles back down to the crankcase. The air/gas mix that is left flows from the center of the centrifuge through a rubber hose ("PCV hose") and connects into the main air intake hose, about a foot after the air filter box (pre-turbo).
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Old 02-05-2015, 08:47 AM
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Re: Any way to block the EGR?

Quote:
Originally Posted by hayasa View Post
There are rumors of an aftermarket tune that will turn off the EGR so you won't have to mess with it mechanically like putting in a block-off kit.
IIRC they don't have it for late model diesel GC's. It seems like there'll be a market for it though.

I'm not sure on the warranty impact of a tune either? I would imagine even if you restored the default settings before going to the dealer for warranty work [if needed] the dealer would be able to tell if changes were made and reset back to OEM settings. That might cause issues.
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Old 02-05-2015, 10:00 AM
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Re: Any way to block the EGR?

That would be a risk I and others would be willing to take. I hope a kit/flash surfaces soon.

I understand the need for emissions controls. But, if I'm going to spend $4,500 extra for the already clean, modern diesel powerplant, I would have expected a more thorough engineering of the systems. I've already heard/read cases where the exhaust gases of larger diesels are cleaner than the air they take in.

The stock controls, clearly, are suffocating this engine on both the Grand Cherokees and the RAM 1500s at low mileages
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Old 02-05-2015, 10:35 AM
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Re: Any way to block the EGR?

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Originally Posted by jeepgrandcherokeesal View Post
That would be a risk I and others would be willing to take. I hope a kit/flash surfaces soon.

I understand the need for emissions controls. But, if I'm going to spend $4,500 extra for the already clean, modern diesel powerplant, I would have expected a more thorough engineering of the systems. I've already heard/read cases where the exhaust gases of larger diesels are cleaner than the air they take in.

The stock controls, clearly, are suffocating this engine on both the Grand Cherokees and the RAM 1500s at low mileages

I'd be willing to gamble myself to be honest. It would would nice to know if setting back to stock could be undetectable to the dealer. Either way I don't think there's a tune just yet.
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Old 02-05-2015, 11:00 AM
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Re: Any way to block the EGR?

I'm curious what oil are you guys with the carbon EGR problems using?
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Old 02-06-2015, 03:14 AM
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Re: Any way to block the EGR?

Quote:
Originally Posted by demarpaint View Post
I'm curious what oil are you guys with the carbon EGR problems using?
Still factory oil for me, haven't done my first oil change yet.
I will most certainly be using the correct spec MOBIL 1 ESP 5-30 low ash oil.
(It's on the "to do list".)

Re "Roadkill's question, as to where the PCV gas feeds in:
Quote:
Not sure I understand your claim. Oil separators are part of the crankcase ventilation system so they can't be pre or post intake (they are not in the intake path). Our CRD has a centrifugal oil separator. It is located on the left front engine cover. Crankcase blow-by gases feed off the crankcase into the separator that is driven by the left camshaft. The rotating centrifuge separates the oil droplets that drizzle across machined baffles back down to the crankcase. The air/gas mix that is left flows from the center of the centrifuge through a rubber hose ("PCV hose") and connects into the main air intake hose, about a foot after the air filter box (pre-turbo).
Thanks for that, you beat me to it.

The PCV air, and oil,, feeds into a small manifold just upstream of the turbo. So every bit of oil gunks up the turbo, and inter cooler, and then the main inlet manifold, then gets burnt and of course adds to ash in the DPF.

Whilst my (roughly) teaspoon of oil every 1,000klms (600 miles) may not be ALL of the oil, it sure helps by eliminating that from the intake air. The ideal would be to have ZERO oil going in.
No doubt the centrifugal separator on the end of the cam shaft probably does a reasonable job, but a lot gets past and the whole idea of the catch can is to get as much as possible.

As for the EGR, it feeds filthy exhaust gas straight into the main inlet manifold (ie: downstream of the turbo) at less than full throttle settings. It seriously gunks up the inlet manifold, and no doubt, inlet valves too.
Many older diesels have EGR, and they are easy to "fix" with a blanking plate, but I suspect it's not so easy on this engine.

See http://www.chiptuning.com.au/egr_blanking_info/

Cya
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Old 02-07-2015, 09:36 AM
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Re: Any way to block the EGR?

Quote:
Originally Posted by Futuresystem View Post
As for the EGR, it feeds filthy exhaust gas straight into the main inlet manifold (ie: downstream of the turbo) at less than full throttle settings.
I'll have to poke around under the hood this weekend and see what sensors we're dealing with. I'll post some pictures soon.
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