EGR valve
EGR valve
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
The EGR valve introduces exhaust gas back into the combustion chamber to effectively reduce the volume of fuel\air (not the ratio). This reduces emissions and cools the combustion chamber.
Why do you want to remove it? If you do, you're asking for problems. There is absolutely no reason to remove it at all; you gain nothing by it. If you remove it, you have to re-jet the carburetor and recurve the distributor to compensate for the drastic change in tuning parameters that will be introduced.
The vacuum line would have to be capped at the source, to answer your question. But that is only one of the many things you'd have to do to correctly accomplish a modification that isn't going to do anything for you in the first place.
Why do you want to remove it? If you do, you're asking for problems. There is absolutely no reason to remove it at all; you gain nothing by it. If you remove it, you have to re-jet the carburetor and recurve the distributor to compensate for the drastic change in tuning parameters that will be introduced.
The vacuum line would have to be capped at the source, to answer your question. But that is only one of the many things you'd have to do to correctly accomplish a modification that isn't going to do anything for you in the first place.
Senior User
Joined: Jan 2007
Posts: 108
Likes: 0
Does and EGR really work on a 30+ year old truck is a better question. I have my doubts. I had to re-plugged up the manifold hole for the EGR on my rig and it runs much better. The PO initially did this, probably because the EGR was bad anyway.
Elder User
Joined: Dec 2007
Posts: 739
Likes: 1
EGR's normally fail in one of two ways.
The vacuum rubber breaks and creates a good size vacuum leak==runs like crap.
The valve itself becomes bunged up with carbon and sticks normally open==idles like crap.
If the valve has enough carbon built up? Chances are pretty high the passageways are also lined with carbon which chokes off the system and it won't do what is intended. EGR's for the most part do not have much of an effect on performance unless they fail. As stated they just direct some exhaust gas back into the system for emissions and it does work fairly well.
To obtain the correct replacement you'll have to get the exact part number off the unit itself. Ford used several different types depending on application/design. You will also need the gasket to mount it. I'd also go as far as suggesting a few cans of carb cleaner which will help aid in blowing some of that carbon crap out of the passageways. Last time I had to work with this system type we wound up taking the spacer plate that was used to a repair shop to soak it in industrial carb cleaner. (took about 8 hours soaking to get all the carbon out of it)
S-
The vacuum rubber breaks and creates a good size vacuum leak==runs like crap.
The valve itself becomes bunged up with carbon and sticks normally open==idles like crap.
If the valve has enough carbon built up? Chances are pretty high the passageways are also lined with carbon which chokes off the system and it won't do what is intended. EGR's for the most part do not have much of an effect on performance unless they fail. As stated they just direct some exhaust gas back into the system for emissions and it does work fairly well.
To obtain the correct replacement you'll have to get the exact part number off the unit itself. Ford used several different types depending on application/design. You will also need the gasket to mount it. I'd also go as far as suggesting a few cans of carb cleaner which will help aid in blowing some of that carbon crap out of the passageways. Last time I had to work with this system type we wound up taking the spacer plate that was used to a repair shop to soak it in industrial carb cleaner. (took about 8 hours soaking to get all the carbon out of it)
S-
Senior User
Joined: Aug 2007
Posts: 176
Likes: 0
From: Covina, CA
are we talking about the smog devices that include the smog pump and inlet lines that go into the cylinder heads??? whreis the EGR located??? whas it look like??
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MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
The EGR valve mounts to a spacer plate underneath the carburetor. It's shaped like a hockey puck, with a vacuum line going to it.
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Posting Guru
Joined: Oct 2005
Posts: 2,282
Likes: 4
From: Oregon
Either spend to money to replace it, because it isn't a bad system. Or, if you do pull it, install the Crane Cams adjustable vacuum kit for the dizzy. Otherwise you will start pinging pretty badly...
Last edited by ihateminimumwage; Jun 20, 2008 at 01:19 PM. Reason: spelling