Boost leak - EGR valve

[Jerkychew]

Hopefully this will be easily answered... I removed my emission controls and changed my vacuum line set-up. My question is: I do not have an egr block-off plate, should i just run vacuum lines from the two nipples on the egr valve to the throttle body?

 

[doggietom]

just take 1 tube and run it from 1 nipple to the other on the egr valve.

 

[Jerkychew]

Okay that sounds good and all but doesn't it need vacuum to operate the valve and avoid leaking into the manifold?

 

[doggietom]

I don't know if it would leak or not i have always just looped the 2 together and i have not had any issue so far.

I have boost leak tested after I looped it around and i had no boost leaks if that helps

 

[Jerkychew]

By chance does anyone know which nipple closes/opens the valve?

 

[doggietom]

just buy this

STM EGR REMOVAL PLATE | 90-99 DSM | EVO VIII-IX

You must be logged in to view this image or video.

This is the factory vacuum setup. Once you block off your ERG valve then the entire emissions vacuum setup is worthless so you might as well remove all of the vacuum lines running from the throttle body including the EGR valve, Thermal vacuum valve, purge control valve, charcoal canister, and evaporative emissions purge solenoid.

Anyways you can follow this diagram to see that two of the line on the throttle body go to the thermal vacuum valve on the thermostat and then over to the over to the EGR valve while the other two go to the purge control valve and then on to the charcoal canister and over to the evaporative emissions purge solenoid.

You must be logged in to view this image or video.

This is how to eliminate the emissions system. Cap off all the ports on the throttle body (you can use one for your boost gauge or you T into the Fuel pressure line). Block off your EGR and then you can remove pretty much everything else.

The only thing wrong with this diagram is that you should not T into the BOV line for your MBC. Use the nipple on the J-pipe/compressor housing instead.

supplied by 9!'clipseDOHC

 

[Jerkychew]

fiiine, i just miss my boost and was looking for a quick fix while i wait for the block off plate...

 

[Bill Hincher]

the reason for the EGR is to re route some exhaust gases into the intake system to cool down the combustion chamber ( thats right, cool down)
the only time the EGR is activated is when the vehicle is in a light load/ cruise condition at partial throttle ( extra lean conditions)
it is imparitive the EGR is blocked out at cold /start conditions, so it should be controled with a thermo valve and it should be controled from an ECU output after warm up is complete