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Unread 02-13-2012, 09:45 AM   #1
slimer74
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1989 YJ Wrangler 
 
Join Date: Jul 2008
Location: Quantico, VA
Posts: 66
2.5L Exhaust Manifold

I'm looking at new exhaust manifolds for my overworked & underappreciated '89 four cylinder that has a crack.

Most of the manifolds for sale are traditional manifolds, but a few have an extra port on the tube coming from the #1 cylinder. What is that port supposed to do?

My manifold has a heat shield with a port in the same location that connects to the air box via a flex hose. It's supposed to route heat from the exhaust manifold to the air box, I think.

Main issue: I want to confirm that I need the traditional manifold, should I buy a new one, not the one with the port in the #1 exhaust tube.

Any advice / education is appreciated.

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Unread 02-13-2012, 11:47 AM   #2
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,957
The 87-90 2.5L have an EGR and the tube is for the EGR. I don't know what emission laws you are dealing with in Va. but if you want to save a few $$$ then you can flange off the egr and run the newer exhaust header. The ones with the egr tubes are expensive!
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Unread 02-13-2012, 02:32 PM   #3
slimer74
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1989 YJ Wrangler 
 
Join Date: Jul 2008
Location: Quantico, VA
Posts: 66
QUE89YJ,
Thanks for the reply. Does that mean that I should have the manifold with the tube that branches off for the EGR or is the port only supposed to be on the heat shield as in the pic below?

Other than just doing the right thing with my repairs, I am moving to California in June and will have to be in strict compliance w/ the emissions to keep my Jeep on base.
674-225-007.jpg  
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Unread 02-14-2012, 11:25 AM   #4
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,957
Nope you need one with the EGR tube. It has a hole for the stainless tube in the front of the manifold. They are way more expensive unfortunately and you know you will need to meet Cal. emissions so you need it. Mine is a Borla.

http://www.quadratec.com/products/17601_03%2007.htm
89-header.jpg  
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Unread 02-14-2012, 11:26 AM   #5
Que89YJ
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1989 YJ Wrangler 
 
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Location: Detroit, Michigan
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The pic is a stock manifold not the Borla. They run just under $200 while the Borla is over $400
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Unread 02-14-2012, 01:03 PM   #6
sotomajr
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1995 YJ Wrangler 
 
Join Date: Feb 2012
Location: Charlotte, North Carolina
Posts: 20
Ebay is your friend

I just bought one on eBay for my 1995. It is universal, and had the port on the side. I had to put a cap on it for it to work on my 2.5L....and it was 80 bucks shipped
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Unread 02-14-2012, 01:04 PM   #7
sotomajr
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1995 YJ Wrangler 
 
Join Date: Feb 2012
Location: Charlotte, North Carolina
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Here is the item http://www.ebay.com/itm/130573797766...84.m1439.l2649
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