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Old June 19th, 2009, 04:12 PM   #1
Daddy Dan
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Default How-to: Delete Emissions (for vehicles not driven on public roads)

Felt like sharing.

WARNING!!! It is illegal to remove your emissions equipment. I can only advise doing this to an off-road vehicle only.

There is a correct way to delete your emissions off of your OBD-I Ford. I've had experience on F-150s, F-250s, and even a couple of Bronco-IIs. Its just about the same for all.

Catalytic Converters:
All vehicles have em. If you still have them on an old, high mileage motor, they are most likely plugged up. First option, replace them. If your low on cash or the vehicle just isn't worth it, cut them out. Using a piece of pipe and a hammer works great for pre-cats. After they are gone, you can disconnect or get rid of your smog/air pump. On SBF, you may now get rid of the thermactor tubes on the back of the motor. I guess it depends on the year, but you can either go get a plug, or cut a bolt down, to use to plug the back of the heads.

EGR:
Same as above, most recommend replacement if possible. If not, it can be removed with no ill side effects on the way the motor runs. I found the best way to plug the lower intake is to cut the tube off and plug the end with a piece of steel welded in. On the upper part, make a block off plate, buy one, or measure the hole and use a freeze plug from your local hardware.


With either of the above done, you need to remove and plug the vacuum lines associated with it. The emissions solenoids(TAB, TAD, EVR) can all be cut out and you can use a 75ohm resistor in their place. This tells the computer they are always closed.

The EVP(EGR position sensor) is easily corrected one of three ways. You can do the cheap and easy way of using a piece of rubber tube glued on to the sensor and thread a large bolt into it untill it reads .5 volts return. Or you could buy an eliminator. Or you could make your own.



Ford Fuel Injection's website(very resourceful) http://rjminjectiontech.com/


I will add more details and pictures later.

Last edited by Daddy Dan; June 20th, 2009 at 12:14 PM.
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Old June 19th, 2009, 05:04 PM   #2
Captain Ledd
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Deleting your emissions is illegal on the FEDERAL level.

Catalytic Converters are really cheap now days. Within about 45 seconds of searching for "Universal Catalytic Converter" I had found a 3-way converter for $40 on Summit. I think spending $20-30 more dollars is worth saving the environment for.

HERE

They really don't hurt performance at all. Most of the performance robbing was done internally like lower CR's and cam specs and other things that were necessary to meet the restrictions before technology improved.

Last edited by Captain Ledd; June 19th, 2009 at 05:08 PM.
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Old June 19th, 2009, 08:45 PM   #3
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There is no reason to remove any emission controls on your engine. I am not a full fledged tree hugging hippy, but have you smelled an engine without a cat on it? Seriously, it helps kill off some nasty smells and some noxious fumes that could incapacitate you when you are stuck in the mud. The EGR is meant to take some unburned fuel and put it back into the intake to get fully burned thus saving fuel that is needed to be used.

Do you think a ford small block was getting 17ish miles to the gallon back in 73 or do you think all the emission controls have helped it a bit?
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Old June 19th, 2009, 08:50 PM   #4
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Okay, I've added a warning to the first post. But, you know as well as I do, that people will still do it. And if you don't do it correctly, you have a poor running EFI system that will run rich and burn more gas.

As far as I've heard, its illegal to re-sell a vehicle without emissions. If its your vehicle and its faulty, I thought it was alright to remove it. And, all you needed was a muffler.

I've also heard from a few ppl in other states where they do emissions testing that running their truck with a hollow cat actually made no difference in their test. But, I do understand the point of having it all. However, some of the EGR set-ups I have seen recently are just stupid. For example, we have 2 '98 E-250s with the 5.4. The EGR pulls gas from only one cylinder. The tube is between the very front driver side port and the one behind it, thus only getting exhaust from that one cylinder. Does that really sound like a system that would really have much impact? I think Ford only put it on there just to meet federal mandate, but they already have it burning clean enough to not need it.
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Old June 19th, 2009, 08:59 PM   #5
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Quote:
Originally Posted by Never_Evil View Post
There is no reason to remove any emission controls on your engine. I am not a full fledged tree hugging hippy, but have you smelled an engine without a cat on it? Seriously, it helps kill off some nasty smells and some noxious fumes that could incapacitate you when you are stuck in the mud. The EGR is meant to take some unburned fuel and put it back into the intake to get fully burned thus saving fuel that is needed to be used.

Do you think a ford small block was getting 17ish miles to the gallon back in 73 or do you think all the emission controls have helped it a bit?
The motors I have ran without cats have been great running motors and no, they don't stink anymore than they did with the cats. I actually was very curious and removed everything off of a '94 F150 with MAF. Did everything I posted in the how-to. All equipment was working, then my EGR tube ruptured. I removed it all and had a huge increase in mileage. I went from 15mpg to 20mpg. My exhaust actually quit smoking when I punched it. As far as I could tell, all the equipment was working fine, most of it got replaced before. I was broke and needed the truck to go to school. I had planned on finding used parts from a low mileage truck and putting it back on, but couldn't see myself doing that after the mileage went up.

Now, in your defense, I did have trouble with a Bronco-II. It actually did stink after I removed the cat. It actually had no EGR from the factory. But the cat was plugged up. Again, no money to spend. A piece of exhaust tube is a lot cheaper than a new cat.
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Old June 20th, 2009, 09:04 AM   #6
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though i agree with captin ledd and never evil, people will do whatever thet want.

I think it's foolish to create a detailed map on how to break the law, if people figure it out on their own, so be it.
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Old June 20th, 2009, 12:11 PM   #7
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Just so you all know, my truck will be driven almost daily. I just did a lot of search on the law and plan on putting converters back on my truck. But, I do want to keep this posted for those who just want to beat their rigs up off-road and don't have funds to replace their worn components. It is better to do what I stated above than to just cut it out and not mess with the electronics. With it all just unplugged, it will run bad, burn rich, and will smoke a lot.

So, if you can fix it, fix it. If not, at least trick the computer so it will run and burn better.

Heck, cats are even cheaper on eBay. I'm going to need 2 short 3" in/out cats for my application. I can get them for just under $40 each.

Last edited by Daddy Dan; June 20th, 2009 at 12:37 PM.
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