EGR, removed???
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Junior User
Joined: Jan 2009
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EGR, removed???
Hello,
Just bought a 1995 F250 rust free with a 7.5l Bigblock 460 with an auto trans...
Truck runs great, but was beat up... 600.00 so I can't complain.
Exghaust has a hole in muffle, leaking under cab... Check engine light comes on once and awhile, and noticed someone cut the EGR Wire...
Here are my questions???
1). What does a EGR do? And Why do I need it?
2). Do I need a Cat??? What about a straight exghaust with a muffler???
3). Is this going to effect any computers???
Let me know, and no I will not need it inspected... Live in NH, going to put Agi Plates on it.
Thanks,
Just bought a 1995 F250 rust free with a 7.5l Bigblock 460 with an auto trans...
Truck runs great, but was beat up... 600.00 so I can't complain.
Exghaust has a hole in muffle, leaking under cab... Check engine light comes on once and awhile, and noticed someone cut the EGR Wire...
Here are my questions???
1). What does a EGR do? And Why do I need it?
2). Do I need a Cat??? What about a straight exghaust with a muffler???
3). Is this going to effect any computers???
Let me know, and no I will not need it inspected... Live in NH, going to put Agi Plates on it.
Thanks,
Posting Guru
Joined: Jul 2009
Posts: 1,069
Likes: 1
From: Toledo, Ohio
EGR- Exhaust Gas Recirculation- Puts exhaust gases back into the intake to be burned even further. Its an emissions thing. It can cause a CEL to come on.
A CAT is a federally mandated piece of emissions equipment. Is it necessary, no. Do you need it? By law, yes. I dont know about your truck but mine (being an 88) the O2 sensor comes before the CATs so it would not effect anything but tailpipe emissions. A lot of guys on here straight pipe their trucks. (and yes, you can put headers on)
And answer about computer is above.
A CAT is a federally mandated piece of emissions equipment. Is it necessary, no. Do you need it? By law, yes. I dont know about your truck but mine (being an 88) the O2 sensor comes before the CATs so it would not effect anything but tailpipe emissions. A lot of guys on here straight pipe their trucks. (and yes, you can put headers on)
And answer about computer is above.
Thread Starter
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Junior User
Joined: Jan 2009
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So basically what you are saying...
I can remove the cat and muffler, and send a straight pipe out...
The EGR doesn't effect the motor, so leave it disconnected???
Is there a Down side to the wire EGR being cut???
Let me know if I understand this correctly...
I can remove the cat and muffler, and send a straight pipe out...
The EGR doesn't effect the motor, so leave it disconnected???
Is there a Down side to the wire EGR being cut???
Let me know if I understand this correctly...
Cargo Master
Joined: Apr 2003
Posts: 3,476
Likes: 224
From: Frequently frozen MN
Possibly others can chime in about how all of this stuff works -- you can also check fordfuelinjection.com
But, removing the egr will increase your emissions -- but nothing like what happens if you pull the CAT. Both are illegal, although there may be some exemption for your ag deal. However, it's not a great thing to do.
EGR does affect performance because it changes the mixture. Putting exhaust gas back in the cylinder cools the charge and also (IIRC) leans the mixture. This is because there's some unmetered exhaust gas going into the cylinder. The PCM is set up for this, so if you remove it, the performance is probably slightly affected. Probably not much in a pre obdii truck.
Ford uses several variations on egr, but from reading these forums there seems to be one or two parts that cause most of the trouble -- you can probably see that if you do a search on egr.
EGR also has problems because the exhaust can clog up the little passageways that it runs through.
But, removing the egr will increase your emissions -- but nothing like what happens if you pull the CAT. Both are illegal, although there may be some exemption for your ag deal. However, it's not a great thing to do.
EGR does affect performance because it changes the mixture. Putting exhaust gas back in the cylinder cools the charge and also (IIRC) leans the mixture. This is because there's some unmetered exhaust gas going into the cylinder. The PCM is set up for this, so if you remove it, the performance is probably slightly affected. Probably not much in a pre obdii truck.
Ford uses several variations on egr, but from reading these forums there seems to be one or two parts that cause most of the trouble -- you can probably see that if you do a search on egr.
EGR also has problems because the exhaust can clog up the little passageways that it runs through.
Thread Starter
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Junior User
Joined: Jan 2009
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The EGR is there, but the wire that goes to it is CUT?? So I take it does not work with the wire being cut. Let me know if you think I should rehook it up, and put a new one in....
If I do remove the CAT, will that increase power or decrease???
I know the Flow restriction will be gone, but the back preasure to???
Its a 460, any suggestions... Reminder don't care about streetlegal...This is more for fun than anything.
If I do remove the CAT, will that increase power or decrease???
I know the Flow restriction will be gone, but the back preasure to???
Its a 460, any suggestions... Reminder don't care about streetlegal...This is more for fun than anything.
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
The wires only report back the PCM, they tell it if the valve is doing what the PCM asked of it to do.
The vacuum line (hose) on top of the EGR valve is what makes it work.
Note one of the wires is the 5 Volt Ref from the computer and if this wire shorts to ground you will have a big problem.
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c.herron92
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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