[RESOLVED] Teach me a bit about egr (alternate blockoff method)

[the_mork]

I'm not terribly familiar with the EGR system and I'm trying to install an evo3 intake manifold. This manifold has no provision for the EGR valve and the general way to take care of this is to just use a blockoff plate. Unfortunately I don't have the bolts handy to run through the EGR valve so I can't put the blockoff plate on.

My question is, is there any reason why I can't just loop the vacuum lines that would go to the EGR? I have an evo8 ecu in my car so I should probably be able to deal with any EGR CEL. How does that vacuum work and how does the car know when the EGR is activated?

 

[92AWDHX40]

Find some bolts somewhere.

 

[wolfman]

Just go to your local hardware store and get the bolts you need.

 

[the_mork]

Of course I could do that but it seems to me that having a purge valve hanging around in my engine bay is just extra crap. If I keep it then I have to wire it up out of the way and it is one more thing that could fail (moving enough to unseat a vacuum hose and cause a boost leak). However if I can just loop the vacuum lines or better yet if I can stop using the E line altogether and it just happens to be sourced to the manifold side of the tb then I can use it to feed my MDP sensor.

Does anyone know what causes an EGR CEL? There aren't any electrical connectors on the valve and AFAIK the car isn't checking for vacuum on one side or the other. Is it just a matter of figuring out cylinder conditions and assuming the EGR isn't working if they are too far off? If that is the case then I already have to deal with that check since there aren't any provisions for EGR in this manifold and I can do whatever I want with my vacuum lines. In that case it brings me back to the question of does anyone know how the EGR vacuum feed line is sourced in the throttle body? I'm using a 1g TB on a 2g so I know that the 1g TB doesn't provide vacuum to the EGR at idle but it will be setup per RREs instructions whereas it should have vacuum at idle.

 

[the_mork]

OK, I just re-read the RRE instructions and I think I understand my problem now. I should be able to just completely get rid of the EGR lines and the valve without any significant worry (I think). At that point I'm still wondering how the lines E and P are sourced on a 1g TB. I also am not sure what the ecu checks for EGR function. I'll do some more searching but I'm leaving this unresolved for now in case someone who knows stumbles across this.

 

[the_mork]

I just left them looped and the car runs fine, I haven't driven very far but I haven't had a CEL yet and when I do I will flash it out of existence since I have an evo8 ecu.

I also got rid of the MDP sensor since in my reading it appears to only be useful for checking EGR function.