EGR valve?
Thread Starter
Burning Brakes
Joined: Jun 2003
Posts: 1,229
Likes: 1
EGR valve?
Is it a good idea to remove the EGR valve from our cars?
I've heard this is one of the main causes for our Intake system to get full of carbon deposits and all dirty.
Will this affect car emissions or give any error codes or will it turn on the engine light in the car if it is removed.
I've heard this is one of the main causes for our Intake system to get full of carbon deposits and all dirty.
Will this affect car emissions or give any error codes or will it turn on the engine light in the car if it is removed.
Pro
Joined: Apr 2003
Posts: 603
Likes: 0
From: Atlanta
Re: EGR valve? (TheStef)
LT1's have them, and I was told it would be ok to remove it. Several reputable companies (including TPIS) make block-off plates for once it is removed. I don't like the idea of hot exhaust gasses being sucked back into my intake manifold. The error code is only an emmision test issue on OBD2 cars.
Thread Starter
Burning Brakes
Joined: Jun 2003
Posts: 1,229
Likes: 1
Re: EGR valve? (BlackBeast2)
I agree, I don't like the idea of exhaust gases going back into my Intake manifold.. I'm not a genius, but I think this is affecting performance?? letting carbon dioxide getting back into the air intake of the engine doesn't sound to good for performance.
I heard it had more to do with emission and burning the unburnt gas over again.
Anyone else with inputs?
Who here actually took it off their car? what results did you get?
I heard it had more to do with emission and burning the unburnt gas over again.
Anyone else with inputs?
Who here actually took it off their car? what results did you get?
Safety Car
Joined: May 1999
Posts: 3,651
Likes: 5
From: Atlantis
Cruise-In I Veteran
Re: EGR valve? (TheStef)
Those deposits are a results of the combination of EGR and PCV.
In the interest of saving the environment, our engines have to breathe their on dirty byproducts.
EGR is evil,wicked mean and nasty.
The only saving grace to it is the ECM cuts it off when you open the throttle.
HOT gas injecting into the manifold mixes with the incoming air and increases the temperature of the air charge AND dilutes it with non-burnable carapp.
I leave it to you to decide if it's a good or bad thing.
PCV NEVER gets cut off.
You CAN minimize PCV injestion by grinding down that wall in your plenum just behind your throttle body.
It's there to create a 'low pressure' (bernoulli's principle) area right above the PCV ports so it will suck in as much of those nasty old crankcase fumes as possible.
You'll also get a little more flow into the plenum with the 'wall' removed.
'Some' folks block off their EGR. But it's not necessary as long as the ECM/PCM cuts it off when you ask for more power.
In the interest of saving the environment, our engines have to breathe their on dirty byproducts.
EGR is evil,wicked mean and nasty.
The only saving grace to it is the ECM cuts it off when you open the throttle.
HOT gas injecting into the manifold mixes with the incoming air and increases the temperature of the air charge AND dilutes it with non-burnable carapp.
I leave it to you to decide if it's a good or bad thing.
PCV NEVER gets cut off.
You CAN minimize PCV injestion by grinding down that wall in your plenum just behind your throttle body.
It's there to create a 'low pressure' (bernoulli's principle) area right above the PCV ports so it will suck in as much of those nasty old crankcase fumes as possible.
You'll also get a little more flow into the plenum with the 'wall' removed.
'Some' folks block off their EGR. But it's not necessary as long as the ECM/PCM cuts it off when you ask for more power.
Race Director
Joined: Sep 2001
Posts: 14,664
Likes: 749
From: NEwhere Ohio
Re: EGR valve? (TheStef)
I have removed it for simplicity (And used the TPIS blockoff plate) when I got my TPIS long tube headers. I have a 93 LT-1
Removing it will setoff a code, and your engine might run in some kind of a conservative timing mode, etc. I am not sure on this.
I had my chip reprogrammed with this in mind. No problems here.
It is there to reduce NOx emissions by lowering your combustion temperature. Introducing exhaust gas into the engine at part throttle chokes the combustion reaction slightly reducing temperature and the chance to form smog causing NOx emissions (nitrogen, normally inert, will react with oxygen to form NOx emissions at high temperatures).
At WOT, the EGR valve is always closed, so it will never hamper WOT performance, and its effect on part-throttle performance is likely minimal.
Removing it will setoff a code, and your engine might run in some kind of a conservative timing mode, etc. I am not sure on this.
I had my chip reprogrammed with this in mind. No problems here.
It is there to reduce NOx emissions by lowering your combustion temperature. Introducing exhaust gas into the engine at part throttle chokes the combustion reaction slightly reducing temperature and the chance to form smog causing NOx emissions (nitrogen, normally inert, will react with oxygen to form NOx emissions at high temperatures).
At WOT, the EGR valve is always closed, so it will never hamper WOT performance, and its effect on part-throttle performance is likely minimal.
Drifting
Joined: Apr 2003
Posts: 1,292
Likes: 2
Re: EGR valve? (VetNutJim)
OK, so EGR is gone for me, but how about plugging the PCV holes just behind the throttle body, or further down in the plenum, would this be a good idea? The PCV could be vented outside the engine - any benefit?
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Thread Starter
Burning Brakes
Joined: Jun 2003
Posts: 1,229
Likes: 1
Re: EGR valve? (Nathan Plemons)
This winter I'm likely to install a Superram intake and a 219Cam, would this automatically block off my EGR valve and also that PVC valve... if that's how you call it :confused:
Will I have to buy that TPIS's EGR valve block off kit? or will the hole
on the intake be automatically eliminated with the new SR intake?
I've noticed two long bars right over the two headers on both side of
the engine, are those part of the EGR system? if so, I'm guessing with the SR intake on I could simply block off or remove those two bars or if I install after market long tube headers this will eliminate the system entirely.
A little help or explanation will help me allot!
Thanks guys
[Modified by TheStef, 3:22 PM 10/2/2003]
[Modified by TheStef, 3:49 PM 10/2/2003]
Will I have to buy that TPIS's EGR valve block off kit? or will the hole
on the intake be automatically eliminated with the new SR intake?
I've noticed two long bars right over the two headers on both side of
the engine, are those part of the EGR system? if so, I'm guessing with the SR intake on I could simply block off or remove those two bars or if I install after market long tube headers this will eliminate the system entirely.
A little help or explanation will help me allot!
Thanks guys
[Modified by TheStef, 3:22 PM 10/2/2003]
[Modified by TheStef, 3:49 PM 10/2/2003]
