got tri - y headers - now what - Page 2 - Mercedes-Benz Forum
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post #11 of 169 (permalink) Old 02-06-2019, 11:45 PM Thread Starter
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but the egr doesnt use a bracket like that? its just a hole with threads on one part of the header right?
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post #12 of 169 (permalink) Old 02-07-2019, 03:33 AM
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The block off plate is for the intake manifold side, to plug the header i would use a threaded plug that way if at a later date the egr valve could be reattached if necessary.
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post #13 of 169 (permalink) Old 02-07-2019, 06:56 AM Thread Starter
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Why would one block the intake manifold. What am I missing here
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post #14 of 169 (permalink) Old 02-07-2019, 07:31 AM
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The recirculated exhaust gasses are fed/drawn into the inlet manifold with intake vacuum.


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post #15 of 169 (permalink) Old 02-07-2019, 08:43 AM Thread Starter
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I need a visual. I'll look in my bag later today.
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post #16 of 169 (permalink) Old 02-07-2019, 01:03 PM
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I just got a brass metric plug from the hardware store to cap the EGR hole on my Euro exhaust. Should be the same as the Try-y. I assume you're not running EGR?

There should be a pic in my engine swap thread - find a pic of the drivers side manifold you'll see the brass cap. Can't leave that open you'll have a massive exhaust leak.

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post #17 of 169 (permalink) Old 02-07-2019, 02:44 PM
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Originally Posted by vdubpower View Post
I need a visual.
Here is the where the flange would go. However, I would not recommend doing that because of the trouble you'd have to go to get to that area and because of the CA emission laws. That would be done only when you remove the intake assembly and plan on refreshing the rubber rings between the two intakes.

If you do have the hole plugged in the intake (that's my understanding ), then most likely you should not worry about that flange.

If you do still have the EGR operational (because of the CA emission laws), just transfer it to the tri-y and do not connect its vacuum line to it (remove the vacuum line and plug the port on the vacuum valve) and reconnect the vacuum tube before you have your emission testing done. The vacuum is what is opening it, and if no vacuum to the EGR then no exhaust gases in the intakle, it's that simple.

Anyway, the EGR issues is probably your easiest part of the entire job you are planing.
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post #18 of 169 (permalink) Old 02-07-2019, 03:37 PM
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I agree with liviu - leave it all in place as if it is functioning but disconnect & plug the vacuum line.
The amount of carbon buildup/mess that EGR system makes to the plenum chamber & intake runners & back of valves etc is not good.


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post #19 of 169 (permalink) Old 02-07-2019, 06:26 PM
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One of the Tr-Y's I just sent off to Swain Tech has a brass fitting that looks like a little pipe/valve--is this the EGR and do I need to do anything with it during installation?
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post #20 of 169 (permalink) Old 02-07-2019, 11:09 PM Thread Starter
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My sec has NO Egr, the hole on the euro logs currently on the car is already plugged with a bolt or something

on my SEL, there is egr and i have no idea if its functioning...maybe...we removed lamda box that wastn functioning and frequency valve when i did the top end rebuild...anything that was non OEM

probably will chop off my old cats eventually on the sel...

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