EGR Valve - Do I need it?

[JeeperChris]

Without going into the long version of the story... I'm changing intake manifolds and am thinking of blocking off the EGR valve, I don't think it's needed.

I know what it does and how it works and I just don't see a need for it.
Am I wrong? Should I keep it?

Thanks

 

[cglax6]

If you need to pass emissions, you'll need it.

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[JeeperChris]

If you need to pass emissions, you'll need it.

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I'm in Michigan and my newer vehicles have never had to be checked so i don't think the Jeep ever would.

Maybe i should just plug the vac line instead? If it's operational it'll get carboned up and really that's what i'm tryint to avoid. Less stuff to go wrong.

 

[Posi]

I'm in Michigan and my newer vehicles have never had to be checked so i don't think the Jeep ever would.

Maybe i should just plug the vac line instead? If it's operational it'll get carboned up and really that's what i'm tryint to avoid. Less stuff to go wrong.

When you say your new vehicles haven’t been check do you mean visual or sniff test? No sniff you should be good.
Your installing a new intake, they make egr and egr delete intakes, at least they do for AMC V8s. At most you will run slightly lean so a carb adjustment may be in order.

 

[gert]

You only need it for emissions, i fanned a plate of 1/4 inch steel to match the gasket to get rid of mine,,,, it takes hot nasty exhaust and recirculates it into the intake


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[Hedgehog]

Lots of people don't like'em, lots of people say leave'em alone. If they do what they say they do I am solidly in the leave'em alone group. I could see removing one if it is finicky and prone to being a maintenance problem, but they are not. They just do their job and keep on working. I know, I know what they do doesn't make sense, but engines like what they like, if a little recirculated exhaust keeps things a little cooler, why not leave it alone.

 

[jzak]

On a slightly related question, do I need the two exhaust hoses coming out of the gas tank that goes to roll over/check valve, if I don't care about emissions?? I was thinking about just plugging them. Thanks!

 

[JeeperChris]

When you say your new vehicles haven’t been check do you mean visual or sniff test? No sniff you should be good.
Your installing a new intake, they make egr and egr delete intakes, at least they do for AMC V8s. At most you will run slightly lean so a carb adjustment may be in order.

When I said 'new' I didn't mean new-new, I meant oem but newer than the current year. I'm installing the '83 exhaust manifold to get rid of the old rusty header so now I'm installing a matching stock intake manifold.

My newer cars ('06 and '05) don't get sniffed or looked at.

Maybe I'll just leave it for now.

 

[GRR]

If your egr valve works, I would leave it. Just remember that if it sticks open, your engine won’t start. I had one stick open when I was out in the woods, 7 miles from anything, before cell phones. I sure was glad when I figured out the egr valve was stuck and got my truck started.


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[Belizean]

If your egr valve works, I would leave it. Just remember that if it sticks open, your engine won’t start. I had one stick open when I was out in the woods, 7 miles from anything, before cell phones. I sure was glad when I figured out the egr valve was stuck and got my truck started.


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How did you figure out that was the problem. I would have probably looked at a lot of other things before that.

 

[GRR]

How did you figure out that was the problem. I would have probably looked at a lot of other things before that.

Some process of elimination and a lot of luck.

It took me a couple of hours to figure it out. I had spark and was getting gas,so I was looking for anything that might screw up the mixture. I didn’t even know what an egr valve was; I was just looking for potential air leaks. I cut a piece of cardboard and blocked it off to get it running.

It was a long time ago, maybe 1990.


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[JeeperChris]

The valve stays closed with no vacuum to it, right?

 

[GRR]

The valve stays closed with no vacuum to it, right?

Correct. Also, there is usually a temperature sensor that prevents it from opening before the engine is at normal operating temperature


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[JeeperChris]

Thanks one and all, I'll have a chat with my mechanic about it but I'll probably leave it on for now.

Heck if it's just a vacuum line controlling it that's easy enough to see how it runs with it and without it working. I can even record fuel economy.