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  #1  
Old 02-07-2011, 11:50 AM
99F250Smitty 99F250Smitty is offline
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Default EGR Explained???

1996 Ranger with the 4.0 When I got the truck the previous owner had installed headers, well they put a new EGR valve on the truck, but didn't install the tube that goes from the EGR down to the manifold, there is a place in the header for it, but they have it plugged. I have the sound of an exhaust leak, that I am thinking now may be coming from the EGR valve being left open. Can I plug it or do I need to find that tube and replace it.

Can someone explain the function of the EGR on these trucks? Thanks.

Brian
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Old 02-09-2011, 01:27 AM
wintermute wintermute is offline
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Default Re: EGR Explained???

So they added the EGR valve body, but didn't connect it to the header? I'm guessing that was just for show to get by a quick visual check at emissions check time. I would guess that, yes you'll need to install the missing part(s) in order to return EGR functionality.

Will this solve your leak? I really couldn't say. That's going to take more investigation. I would also venture a guess that a weld somewhere on the header has cracked. Not all headers are created equal. I know some brands for 00-05 and 06-present Impalas were a crap shoot on weld integrity. I don't know anything about Ranger headers though.

As far as EGR goes, As I recall, it's an emissions function for cold starts designed to raise the intake charge temps in order to ensure complete fuel burn and in turn reduce the time needed for the catalytic converter(s) to warm up to operating temperatures. It does this by siphoning off some exhaust and dumping it back into the intake manifold behind the throttle body.
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Last edited by wintermute; 02-09-2011 at 01:32 AM.
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Old 02-09-2011, 02:29 AM
87bullsnkranger 87bullsnkranger is offline
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Exclamation Re: EGR Explained???

Quote:
Originally Posted by wintermute View Post
So they added the EGR valve body, but didn't connect it to the header? I'm guessing that was just for show to get by a quick visual check at emissions check time. I would guess that, yes you'll need to install the missing part(s) in order to return EGR functionality.

Will this solve your leak? I really couldn't say. That's going to take more investigation. I would also venture a guess that a weld somewhere on the header has cracked. Not all headers are created equal. I know some brands for 00-05 and 06-present Impalas were a crap shoot on weld integrity. I don't know anything about Ranger headers though.

As far as EGR goes, As I recall, it's an emissions function for cold starts designed to raise the intake charge temps in order to ensure complete fuel burn and in turn reduce the time needed for the catalytic converter(s) to warm up to operating temperatures. It does this by siphoning off some exhaust and dumping it back into the intake manifold behind the throttle body.
cool makes a little sense,and i believe his egr setup is similar to mine,and explains my first of the day hard start because mines clogged up needs changeing plus the egr sensor is shot.The ? i have with my problem long running my LiL'ranger this way will it make my electronics like my brain box that runs the codes for all that extra crap make it run bad eventually?
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Old 02-09-2011, 06:46 AM
99F250Smitty 99F250Smitty is offline
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Default Re: EGR Explained???

Well the guy that I bought it from told me that it wasn't hooked up. I got a deal, I wasn't concerned, Just trying to figure out where the leak is coming from. Didn't know under throttle if that valve sucked air or pushed it out, so I am now assuming that is not where my leak is coming from.

They are pace setter headers, should a stock tube work? and does anyone know where to find that tube, I have been unsuccessful.
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Old 02-09-2011, 07:54 AM
pooleo pooleo is offline
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Default Re: EGR Explained???

stainless steel gas dryer/stove hookup tubing works very well for that tube. Thats what I used on my headers to hook it up.
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Old 02-10-2011, 05:06 AM
99F250Smitty 99F250Smitty is offline
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Default Re: EGR Explained???

What did you use for connections?
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Old 02-10-2011, 06:10 AM
rwenzing rwenzing is offline
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Default Re: EGR Explained???

Quote:
Originally Posted by 99F250Smitty View Post
Can someone explain the function of the EGR on these trucks?
EGR is Exhaust Gas Recirculation and its target pollutant is NOx (oxides of nitrogen). By replacing some of the incoming air/fuel charge with inert exhaust gas, it is possible to reduce the peak combustion temperature which, in turn, reduces NOx formation.

Cam overlap provides some recirculation of exhaust gases and, for some vehicles, that's enough. If more recirculation is needed, the EGR system is added.

In Fords and most other cars, the EGR valve is usually used at part throttle conditions only and turned off at idle and WOT. That's why, from a performance point of view, there is nothing to be gained by defeating EGR. EGR may also SLIGHTLY increase part throttle fuel economy because it allows slightly more ignition advance without detonation.


Quote:
As far as EGR goes, As I recall, it's an emissions function for cold starts...
Actually, the opposite is true. EGR is kept turned off during initial warmup because it is not needed and also because it can cause driveability issues in a cold engine.
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  #8  
Old 02-10-2011, 10:14 AM
99F250Smitty 99F250Smitty is offline
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Default Re: EGR Explained???

So aside from a performance point of view. What would it hurt to just block it off instead of having an open hole?
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  #9  
Old 02-10-2011, 11:34 AM
OilBurner OilBurner is offline
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Default Re: EGR Explained???

I disconnected mine, the exhaust rubbish soon clogs up the valve and I have seen the inlet manifold get clogged as well. I dont eat my own rubbish and dont see why my trucks should
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  #10  
Old 02-10-2011, 11:33 PM
wintermute wintermute is offline
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Default Re: EGR Explained???

Quote:
Originally Posted by rwenzing View Post

Quote:
Originally Posted by wintermute
As far as EGR goes, As I recall, it's an emissions function for cold starts
Actually, the opposite is true. EGR is kept turned off during initial warmup because it is not needed and also because it can cause driveability issues in a cold engine.
Thanks for the clarification!
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