94 3.9 EGR removal
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Registered User
Joined: Feb 2011
Posts: 9
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From: Detroit
94 3.9 EGR removal
Hi, couple quick question's here.
When i bought my 94 Dak 3.9, the whole exhaust pipe was replaced with no catalytic converter's and a turbo muffler. Now my question, the EGR system run's by recirculating the exhaust gases trapped in the cat, back into the engine to be re-burned. But if there are no cat's, than what's the point of even having the EGR. I would like to remove it to clean up the engine a little bit.
Is it safe to remove the EGR and will it pull any codes? Anyway to bypass these code's?
What are the step's on removing it, and any kind of vaccum re-arrangment?
Do they make a EGR delete plate, or will i have to fabricate one?
Because the EGR is not hooked up, could it be causing a vaccum leak?
Any help of this would be greatly appreciated. If something need's to be further clarified to understand the problem, just let me know and i will answer.
When i bought my 94 Dak 3.9, the whole exhaust pipe was replaced with no catalytic converter's and a turbo muffler. Now my question, the EGR system run's by recirculating the exhaust gases trapped in the cat, back into the engine to be re-burned. But if there are no cat's, than what's the point of even having the EGR. I would like to remove it to clean up the engine a little bit.
Is it safe to remove the EGR and will it pull any codes? Anyway to bypass these code's?
What are the step's on removing it, and any kind of vaccum re-arrangment?
Do they make a EGR delete plate, or will i have to fabricate one?
Because the EGR is not hooked up, could it be causing a vaccum leak?
Any help of this would be greatly appreciated. If something need's to be further clarified to understand the problem, just let me know and i will answer.
Captain
Joined: Oct 2010
Posts: 579
Likes: 1
From: Florida
Hi, couple quick question's here.
When i bought my 94 Dak 3.9, the whole exhaust pipe was replaced with no catalytic converter's and a turbo muffler. Now my question, the EGR system run's by recirculating the exhaust gases trapped in the cat, back into the engine to be re-burned. But if there are no cat's, than what's the point of even having the EGR. I would like to remove it to clean up the engine a little bit.
Is it safe to remove the EGR and will it pull any codes? Anyway to bypass these code's?
If you removed your O2 then you will get a code from that. You can buy an O2 simulator, but your on your own for tuning.
What are the step's on removing it, and any kind of vaccum re-arrangment?
Do they make a EGR delete plate, or will i have to fabricate one?
There are people that make them, but it is so easy most do it themselves. You merely trace a gasket on steel and bolt it to the manifolds.
Because the EGR is not hooked up, could it be causing a vaccum leak?
EGR is on the exhaust side of the system so it does not affect vacuum.
Any help of this would be greatly appreciated. If something need's to be further clarified to understand the problem, just let me know and i will answer.
When i bought my 94 Dak 3.9, the whole exhaust pipe was replaced with no catalytic converter's and a turbo muffler. Now my question, the EGR system run's by recirculating the exhaust gases trapped in the cat, back into the engine to be re-burned. But if there are no cat's, than what's the point of even having the EGR. I would like to remove it to clean up the engine a little bit.
Is it safe to remove the EGR and will it pull any codes? Anyway to bypass these code's?
If you removed your O2 then you will get a code from that. You can buy an O2 simulator, but your on your own for tuning.
What are the step's on removing it, and any kind of vaccum re-arrangment?
Do they make a EGR delete plate, or will i have to fabricate one?
There are people that make them, but it is so easy most do it themselves. You merely trace a gasket on steel and bolt it to the manifolds.
Because the EGR is not hooked up, could it be causing a vaccum leak?
EGR is on the exhaust side of the system so it does not affect vacuum.
Any help of this would be greatly appreciated. If something need's to be further clarified to understand the problem, just let me know and i will answer.
Thread Starter
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Registered User
Joined: Feb 2011
Posts: 9
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From: Detroit
Alright, well thanks for the help. I guess what i was mostly concerned about was that there was a possibility there was a vaccum leak, cause i still can't get the idle normal on this damn thing. But after further inspecting the EGR this morning, the tube that run's from the EGR never did hook up to the catalytic converter, but it bolts on to a port on the exhaust manifold. Is everyone else's 3.9 EGR similar to this setup?
Also, i am not worried about emissions or pollution, i live in Detroit where we don't get emission tests.
Also, i am not worried about emissions or pollution, i live in Detroit where we don't get emission tests.
Last edited by ericjohnson7769; Mar 20, 2011 at 04:00 PM.
The EGR increases the efficiency of a vehicle to "excite" the incoming air charge with latent heat (energy), and burns some more of the hydrocarbons that did not fully combust during the initial cycle. Regular gas laws do not apply to combustion due to the compression of the gases and some unsavory hydrocarbons are produced. Since you do not have a catalytic converter, your NxO production will skyrocket, and you should go make a algae pond to offset the pollution. Since your deleting the EGR you should plant trees around said pond to further offset said pollution.
Captain
Joined: Oct 2010
Posts: 579
Likes: 1
From: Florida
Umm thanks? I must say that any excess energy in a system cannot effectively remove energy from that system. It just goes against thermodynamics.
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Good read for those who do not understand the function of the EGR
http://en.wikipedia.org/wiki/EGR_valve
http://en.wikipedia.org/wiki/EGR_valve
Captain
Joined: Oct 2010
Posts: 579
Likes: 1
From: Florida
The latent heat loss is from the combination of N2 and O2 (which effectively requires energy to bond the molecules). While, I agree that there is a net energy loss due to post combustion molecular bonding, your premise was confusing. It is a fair reference to wikipedia. Thank you for clarifying.
Record Breaker
Joined: Mar 2009
Posts: 2,181
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From: Battle Ground WA
Now my question, the EGR system run's by recirculating the exhaust gases trapped in the cat, back into the engine to be re-burned. But if there are no cat's, than what's the point of even having the EGR. I would like to remove it to clean up the engine a little bit.
Removing it won't clean up the engine either, all that crap is on the back of the engine and is pretty much unseen.
There's no reason to remove it if it's working properly. The only reason mine is removed is because I installed a non-EGR M1 intake manifold. My truck also uses a standalone computer to run the injectors (with the stock computer it always had a few minor issues after I removed the EGR, including an occasional backfire through the intake). Removing the EGR and running a standalone computer are both illegal, however my emissions are actually slightly lower than stock.
Last edited by Hahns5.2; Mar 21, 2011 at 07:34 PM.