Airbox

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gixxerkid3

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Question. What’s the difference between a OEM 2.5l and a 4.0l Airbox on a 1992 YJ? Looking at a really nice used OEM one on eBay for $99.99. Going to offer less though. Is there a difference size / attachment wise?

I currently have an aftermarket “KN” that the PO had on and I don’t like it.

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gixxerkid3 said:
Question. What’s the difference between a OEM 2.5l and a 4.0l Airbox on a 1992 YJ? Looking at a really nice used OEM one on eBay for $99.99. Going to offer less though. Is there a difference size / attachment wise?

I currently have an aftermarket “KN” that the PO had on and I don’t like it.

View attachment 119713
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From 91-95 I believe they are the same airbox (they take the same filter) and just have different hoses to reach the throttle body on the engine. You'll have to confirm that but I think that's how Jeep did it.
 
Ok, so worst case scenario I end up buying new hoses from O’reilly or something. Thanks .
 
gixxerkid3 said:
Ok, so worst case scenario I end up buying new hoses from O’reilly or something. Thanks .
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By hose I’m talking about the big corrugated one going from the end of the box to the throttle body. Probably need to snag that off eBay if what you’re looking at doesn’t come with it or if it’s for the wrong engine.
 
Oh. Well this one comes with that . I was talking about the rubber vent hose. I should be good then. Do you think there’s any real benefit going back to stock from that stupid one I have on there now
 
According to this parts diagram the big hose is different from 4.0 to 2.5. So make sure whatever you are buying has the big hose for a 2.5. The box and lid are the same. The hoses going from the box to the intake manifold, valve cover, etc should still be able to be bought or either engine I'm pretty sure.

On a 2.5 you have an elbow at the rear of the valve cover and a hose connects that to the airbox. At the front of the valve cover is a threaded tube with a hose on it. That hose goes to the intake manifold. So I don't think that front hose would be disturbed. You would need the hose to connect the rear valve cover elbow to your new air box. And then would need the hose going from the airbox down to the charcoal canister if you do not still have that.

Personally I hate aftermarket intakes, so I would say going back to stock is worth it. Not everyone would agree with me though.

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Well. I was not aware that I would also need parts 13-16 as well . That changes the whole plan. The below is what I am looking at but if I need parts 13-16. I may pass.

www.ebay.com

Jeep Wrangler YJ 1991-1995 2.5L 4 Cylinder Air Cleaner Air Box Intake Assembly | eBay

Jeep Wrangler 2.5L 4Cly YJ Air Cleaner Filter Box With intake tube. We provide the best hospice care until the Jeep moves on. This will fit Wranglers 1991-1995 with 2.5l 4 cylinder engine.
www.ebay.com
 
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gixxerkid3 said:
Well. I was not aware that I would also need parts 13-16 as well . That changes the whole plan. The below is what I am looking at but if I need parts 13-16. I may pass.

www.ebay.com

Jeep Wrangler YJ 1991-1995 2.5L 4 Cylinder Air Cleaner Air Box Intake Assembly | eBay

Jeep Wrangler 2.5L 4Cly YJ Air Cleaner Filter Box With intake tube. We provide the best hospice care until the Jeep moves on. This will fit Wranglers 1991-1995 with 2.5l 4 cylinder engine.
www.ebay.com
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Mine does not have 13/15/16 from the factory. I have the little inlet piece that clips into the grille and slide into the airbox. I believe there is a little cab on the downward facing pipe. Probably what you have too.
 
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If I remember when i get home I'll take one. It's quite simple. I may be able to find a representation off the web in the mean time.
 
This is exactly what I have. Left part clips into the grille and sucks cool air from the front. that little protruberance is capped like the pic. The right end sticks into the airbox (the airbox slides onto it really) and then the airbox sits down on the fender bracket once it's on the tube far enough. Then you use the 3 clips to lock the box down to the fender bracket. Then put in the filter, set on the lid, hook all the hoses to the lid, and clip the lid down to the box.

you probably still have the part pictured below.


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Ok. Makes total sense. I think I will keep what I have for now. As always your help is much appreciated.
 
But I would still need that piece you have right? The box on eBay alone would not be enough and be correct?
 
machoheadgames said:
This is exactly what I have. Left part clips into the grille and sucks cool air from the front. that little protruberance is capped like the pic. The right end sticks into the airbox (the airbox slides onto it really) and then the airbox sits down on the fender bracket once it's on the tube far enough. Then you use the 3 clips to lock the box down to the fender bracket. Then put in the filter, set on the lid, hook all the hoses to the lid, and clip the lid down to the box.

you probably still have the part pictured below.


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Lol. I just saw this very picture on eBay. Well the price is adding up if I need that. Not sure going back to stock is worth $140+
 
Actually you could buy the ebay box and then make something that slides in to replace the other part. The way it is designed with the turn down and being low in the grill makes it subject to sucking up water.
 
I though about that. Might just do it. Is there any real gain to going back to stock?
 
Better filtration is the main one, also, the box is less likely to suck in water splashed in the engine bay or thrown by the fan.

In dusty environments, the K&N lets too much dirt through and it's not improving perf as the factory filter does not restrict the 6 cyl much less the 4.
 
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