BlackC6LS3

Well considering how much of a pian in the butt it is to pull the egr everytime you take off the headers or the intake manifold on an LT1, I was wondering what was to be gained by removing it completely. Are there any drawbacks? Besides the pipes, hoses, valve what else has to be removed? I know I'll need a set of block off plates and the egr taken out of the tune but what else will I need/need to do?

Thanks in advance,

Dave

onedef92

This link should tell you all you need to know...


http://shbox.com/1/4th_gen_EGR.html

BlackC6LS3

That site makes it sound like a good thing. The only reason I thought about removing it now was because I have some of it apart and the 396 I will be building and installing has an LT4 intake without the EGR.

Thanks again,

Dave

bogus

I will warn you, the EGR is required on your car, and with states adopting more strignent emissions testing, you will fail, unless you pick the right cam to keep NOx down.

NJ is one of the NE states adopting those tougher Cali like standards.

Don't say I didn't warn you.

BlackC6LS3

Well I'm considering registering the car as a collector car to eliminate the need for emissions. Considering wrench-time and down-time I think I'll be able to abide by the mileage limitation.

Dave

VR'92

Bogus is right. If you live in ****-ville It would be wise to keep em on. Although your car should easily pass emissions if you still have bullet cats and a good tune, It may not pass their visual.

I have fully removed my system and it is wonderful. Love the extra room and the clearance gained. Spark plug changes take me 30 minutes now where before it was hours.

Besides block-off plates you will need custom tuning to eliminate the need for EGR/AIR in the computer. It will throw a code without the system in place so this is a must. Also you can track the EGR pipes and remove the AIR pump (Lower left headlight) Along with some other components.

onedef92

Or, you can just get an LT4 engine. They deleted the EGR altogether from the get-go!

bogus

you don't need the engine, just the harness and PCM.

Tom Piper

I agree, there are very few reasons to eliminate EGR.
And, several good reasons to keep it.

Reaons to eliminate it:
1) You have too much EGR at part throttle because of a wild cam
2) EGR stuff gets in the way.

Reasons to keep it:
1) It doesn't hurt performance because it is shut off at WOT.
2) Required for inspections.
3) Resale value when the only person that looked at your car is from California.
4) It cools peak combustion temperature (that is exactly what it is supposed to do) and helps eliminate detonation.
5) Why pollute when there isn't any benefit.

Tom Piper

VR'92

VR'92

You should also add:

3) Cakes inside of Intake manifold and TB components with Exhaust soot. Can cause issues with TB Idle Air screw and any other sensors which probably wouldn't do well with build-up over an extended amount of time.

I would disagree with this when you get to the world of headers/tunes and bullet cats. With the cats and a good tune I seriously doubt the pollution caused with and w/o EGR is a noticable amount or honestly a worth mentioning amount.

Tom Piper

It's not my specialty, but to my knowledge, cats do not help in the elimination of oxides of Nitrogen. EGR does.
Cats have another purpose.

Tom Piper

bogus

that's what I thought, but modern 3-way cats do lower EGR.

Someone posted a link to a site that explains it, I don't pretend to know the science.

BlackC6LS3

Well I am going with the LT4 intake on a 396, with longtubes so EGR is going this winter anyway. For now I have some of the stuff off and figured I might as well keep it off. Any other specific thing to remove? I see the pipes, hoses and the motor but there are also other things along the wa I am not sure about.

Thanks,

Dave

VenkmanP

Just how often do you have to remove the headers or the intake manifold?

Do them right the first time, then you don't have to mess with the EGR but once...

BlackC6LS3

So far I pulled off the pipes that come off of the headers, the hoses that go from the pipes to the valve under the ASR box, vaccum lines that go from the intake to the EGR valve and then to the box under the ASR, and the hose that goes from there to the pump. I see there are a lot of wires near the motor. Which of those get removed? How about the plugs you are left with? Tape them up, let them hang, what did you do with them?

Corvette Kid

I don't know about his '93 but on my '95 the AIR and EGR systems are removed and there have never been any codes or issues. The EGR switch is still hooked up and this seems to make the computer happy.

You don't need that. The reason the LT4 didn't require EGR to satisfy emission requirements is that it has just enough overlap in the cam profile to accomplish what the EGR does, that is to put a certain amount of unburned gasses back into the air/fuel mixture in the combustion chamber. Hence, nearly any aftermarket cam will accomplish the same thing, making the EGR redundant for emissions purposes. In other words, one need not even feel guilty, even if it may not satisfy the emissions ***** in all places. They are mindless bureaucrats w/o a clue to anything pertaining to the real world.

BlackC6LS3

What does the switch look like?

Thanks,

Dave

Corvette Kid

If it's like my '95, it's located on the driver's side of the intake. It has a plug going to it from the engine harness and two vacuum lines. One from the intake to the switch, the other from the switch to the EGR valve. The vacuum lines can be eliminated completely as long as the wires are still plugged in. That's all that matters to the computer.

Casethecorvetteman

You can disable these codes as well as set the operating parametres of EGR and AIR with Tuner Cat on a 94/95. And once you disable the codes from the list, you can then unplug the whole lot with no issues at all!