Do you recommend delete the EGR?

J

Jabarov

Greenie N00B Member
Hello. I own a Gen 2 Mazdaspeed 3. This week I installed the Corksport HPFP+Rebuild Kit. I also installed a new intake system and boost solenoid. Do you recommend removing the EGR?

I asked Versatuner. It is possible to turn off the engine light.
 
It depends on your emissions testing laws. If you have no testing required at all, you can (illegally) do whatever you want.
There are benefits and detriments to removing the EGR though; you'll want to Google that to find out before making your decision, but I personally agree with Buns' take.
 
Thanks guys. If I'm not going to delete the EGR, do you recommend cleaning it? Is it worth the effort?
 
Depends on how full of shit it is. If you're not getting codes, it might be OK; otherwise I think its 2 bolts on one end and the big retaining nut on the other. Full cleaning would mean removing both manifolds though, and most people don't go that far.
 
Enki said:
Depends on how full of shit it is. If you're not getting codes, it might be OK; otherwise I think its 2 bolts on one end and the big retaining nut on the other. Full cleaning would mean removing both manifolds though, and most people don't go that far.
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Yeah, I only did the valve and pipe after getting P0455. Followed this: https://mazdaspeeds.org/index.php?posts/121888/

But last night saw cleaning the IM as well. To be fair, I didn't realize people did the manifolds until reading/viewing it last night. I based my work on the thread only.
 
I mean, you can *probably* get away with just spraying shit in there (like carb cleaner or something) and then blowing it out with compressed air to avoid issues with the car running like shit after, but to be really thorough about it, you do need to pop the manis off for a good ole scrub.

Edit: Especially on the exhaust side, that's where the worst of it will likely be.
 
Enki said:
I mean, you can *probably* get away with just spraying shit in there (like carb cleaner or something) and then blowing it out with compressed air to avoid issues with the car running like shit after, but to be really thorough about it, you do need to pop the manis off for a good ole scrub.

Edit: Especially on the exhaust side, that's where the worst of it will likely be.
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Well that would be better than the Techron Fuel system route. I saw it in another thread and thought that may foul up the life of my injectors. I'll add it to the list, but near the bottom based on my level of desire.
 
Enki said:
Depends on how full of shit it is. If you're not getting codes, it might be OK; otherwise I think its 2 bolts on one end and the big retaining nut on the other. Full cleaning would mean removing both manifolds though, and most people don't go that far.
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Just a heads up.... That retaining nut *can be very hard to remove.. it's a 22 in think..
Mine would not come off..

I would just leave it on.

Do valve cleaning and don't sweat it too much
 
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I yeeted that shit out, don't want any exhaust gas into my intake manifold/ valves. now you can also just unplug it, valve defaults closed so if it's clean and sealed when you unplug the harness it should never open. yes you'll get the check engine light, yes you can turn that off with versatune.

if you're in an area where it's required for emissions leaving it in is your best bet.

that big nut on EGR tube on the intake manifold is a pita. best taken off when the IM is on a bench
 
It is my understanding that if you've got a really big turbo, you have to delete it just for the space.

As far as passing emissions, obviously if you are in California, it's a complete no-go. In most other states, a single device in not-ready state will pass emissions. And the EGR system can be put into a perpetual not-ready state with a Cobb Access Port. Or at least it could be with the older software. It is my understanding that the long arm of the law came down and newer software can't do that. I'm not completely certain on that. Someone else can confirm. But at least for me and my car, my EGR is in perpetual not-ready state and it passes Texas emissions. And the CEL doesn't come on, which is nice.

Of course the advantages of removing it are less carbon deposits. And, I have heard (not certain) but I've heard that the stock EGR system is unbalanced, giving more exhaust gas to some cylinders than to others. And of course the stock manifold is unbalanced for air as well. I think it is worth deleting the EGR, if you can manage the emissions aspect.

The Damond water manifold is a nice little piece, though perhaps not really necessary and perhaps not really worth what it costs. But it's a fancy/schmancy EGR delete, freeing up some space in the area.
 
Thanks, guys. I removed and cleaned the EGR today. New gaskets are on their way; I'll install them when they arrive. The EGR was very dirty.

Do you recommend that I unplug it and use it, or should I use it plugged in?

When I install the EGR exhaust pipe, do I need to apply silicone? What type of silicone should I use?
 

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id use it unplugged as it'll be closed so that np exhaust gas flow onto your valves.

you don't need silicone on the nut side that's a friction fit, gasket on the flat two bolt side
 
Awafrican said:
id use it unplugged as it'll be closed so that np exhaust gas flow onto your valves.

you don't need silicone on the nut side that's a friction fit, gasket on the flat two bolt side
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Thank you. Sorry for my English, I'm using translator. If unplugging the EGR works, why do people install a metal plate to remove it? If I unplug the EGR, will exhaust no longer enter it? If I plug the EGR back in during inspection, will the engine light turn off?
 
removing it gives you space for a bigger intake, it also makes it easier to remove the intake manifold. yes unplugged has no gas flows. IF you plug it back in 1-2 drive cycles and the cel will turn off
 
Thank you.
Awafrican said:
removing it gives you space for a bigger intake, it also makes it easier to remove the intake manifold. yes unplugged has no gas flows. IF you plug it back in 1-2 drive cycles and the cel will turn off
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Thank you. If I unplug or delete the EGR, I don't need a calibration for that, right?
I'll unplug the EGR and see how the car reacts. If I don't like it, I'll plug it back in.
 
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