Leaking EGR Cooler - Chevy and GMC Duramax Diesel Forum
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Old 01-12-2012, 04:18 AM   eBay Motors  #1 (permalink)
 
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Leaking EGR Cooler

I have a coolant leak at my egr cooler and was wondering if I could simply bypass any coolant going in and out of the cooler by connecting the two coolant hoses together?

Would there be any damage to the heater core by doing this?

I'm planning on blocking the egr very soon and would bypass at that time.

Thanks
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Old 01-12-2012, 04:48 AM   eBay Motors  #2 (permalink)
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just do an egr delete kit. gets rid of the cooler and egr. just my $.02
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Old 01-12-2012, 08:23 PM   eBay Motors  #3 (permalink)
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WHat dmaxhd said. don't cost to much and then its gone! and most get a little better MPG after the delete.
i wish i would have just bought the delet kit and not the blocker and finger stick for the 65 bucks it cost me!
put a little more into it and youll be happy ya did
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Old 01-12-2012, 08:33 PM   eBay Motors  #4 (permalink)
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After you see what your intake tract looks like when you take the cooler off to fix the leak, you will want to delete it.

Look at the intake ports on the head of this LBZ, all that black coloring is soot
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Old 01-12-2012, 08:37 PM   eBay Motors  #5 (permalink)
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I need to delete mine as well. Can anyone point us in the right direction for a good delete kit?

I was looking at this but heard bad things about it.
Sinister LLY Duramax EGR Delete
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Old 01-12-2012, 08:39 PM   eBay Motors  #6 (permalink)
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Don't waste your money on the Sinister kit, they need to stick with 6.0 Ford deletes.

Get with a vendor on here and get one from ProFab or SDP. Both are very well put together kits.
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Old 01-12-2012, 08:42 PM   eBay Motors  #7 (permalink)
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Those of us who unfortunately live in emissions test cities might do the blocker over the delete since the inspectors are starting to look under the hood. Wouldn't a blocker achieve the same result as a delete in terms of preventing the intake build-up? Obviously, if you can remove un-used part that's better but I don't think the inspectors would catch a blocked egr as long as you can pass the tailpipe test and aren't throwing emissions codes from the blocked egr (like my VW will do if I block the egr).

ETA: Obviously from my sig it's not an issue on my current truck but I am planning to get an LBZ so I need to learn more about this.
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Old 01-12-2012, 08:47 PM   eBay Motors  #8 (permalink)
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Yes the blocker will stop exhaust gas flow back into the engine. But you still have coolant circulating through the cooler which can ( not very often) rupture and leak, Then you will be pumping coolant into the intake.
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Old 01-12-2012, 09:00 PM   eBay Motors  #9 (permalink)
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Quote:
Originally Posted by GMguy View Post
Yes the blocker will stop exhaust gas flow back into the engine. But you still have coolant circulating through the cooler which can ( not very often) rupture and leak, Then you will be pumping coolant into the intake.
Thanks. This risk exists whether or not you do a blocker correct? In other words, blocking the exhaust flow doesn't increase the chance that the coolant flowing through the egr cooler will leak does it?

BTW, does the egr block or delete cause any emissions codes on the d-max's? On my VW Jetta TDI, it will cause a code and persistent CEL that can't be prevented without some special ecm tuning making the egr delete/block more expensive than it's worth. One of the sensors somewhere in the intake side of things I believe sees too much fresh air as a problem and throws the code. Crazy when you think about it. Gotta love the EPA.
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Old 01-12-2012, 09:55 PM   eBay Motors  #10 (permalink)
 
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Quote:
Originally Posted by GMguy View Post
Yes the blocker will stop exhaust gas flow back into the engine. But you still have coolant circulating through the cooler which can ( not very often) rupture and leak, Then you will be pumping coolant into the intake.

This is where I'm at now. Cooler is leaking coolant out a very small hole in the outlet elbow.

I've got EFILive Spade ordered with a block plate. I don't want to spend the money on a delete kit right now. So, will connecting the two coolant hoses together, inlet and outlet, on the egr cooler, do any harm?
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