emissions delete
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Freshman User
Joined: Nov 2011
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emissions delete
hi every one im going to be getting a 94 f150 I6 5 speed soon here and i was wondering what emission related stuff i can take off with out throwing a code. im going to ditch the cats on it and strait pipe it, what else is there to take off to make this a very reliable as this truck is going to be my DD. thanks for the advice in advance 
Postmaster
Joined: May 2003
Posts: 3,310
Likes: 9
From: E.Lincoln County, NC
I have no idea why everyone thinks removing emissions equipment makes a truck run better. Besides, it's ILLEGAL, hello. Your truck is engineered to perform properly WITH the emissions equipment. Fix it and everyone will live happily ever after!
Junior User
Joined: Aug 2010
Posts: 95
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From: Canada
Hey rusty,
I would keep the EGR on your truck... if it is used daily you will get better mileage.
However, I would remove the smog pump and associated tubing and run a shorter belt. It will clear up some ugly tubing clutter in the engine bay and free up a couple hp. If you plan on cutting out the cats, there's no point in having the smog pump. Do a quick search on here and you'll find some great step by step threads.
Other than that I say you're good. Don't let other people on here scare you out of doing it. If you have the time and tools its a good way to start learning your way around the truck. My truck passed emissions with a hollowed out cat and no smog pump. Just a good tune up prior, timing bump and premium fuel. Good to go!
I would keep the EGR on your truck... if it is used daily you will get better mileage.
However, I would remove the smog pump and associated tubing and run a shorter belt. It will clear up some ugly tubing clutter in the engine bay and free up a couple hp. If you plan on cutting out the cats, there's no point in having the smog pump. Do a quick search on here and you'll find some great step by step threads.
Other than that I say you're good. Don't let other people on here scare you out of doing it. If you have the time and tools its a good way to start learning your way around the truck. My truck passed emissions with a hollowed out cat and no smog pump. Just a good tune up prior, timing bump and premium fuel. Good to go!
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Freshman User
Joined: Nov 2011
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thanks for your quick reply i think the smog pump is already taken off but ill check when i get it home. i was thinking about blocking the egr because its stuck open i think i gotta pull it apart to find out for sure
Postmaster
Joined: May 2003
Posts: 3,310
Likes: 9
From: E.Lincoln County, NC
Nobody is trying to "scare" anyone. Ford just has a team of engineers that I'd say were a bit better at their job than those who want to re-engineer their truck. Your truck, your dollars, go for it.
Posting Guru
Joined: Apr 2011
Posts: 1,119
Likes: 1
From: Hartland, WI
A blocked open EGR will cause a poor idle or a no idle condition. Verify there is a problem before trying to "diagnose" it.
I agree with ncranchero: The truck and engine were designed with all of this equipment in mind. It was tested for countless hours and evaluated before being mass produced. If it wouldn't be reliable, they wouldn't sell it, their reputation is on the line. Removing functioning cats will not increase power in any way on an EFI engine. If they are clogged or melted, then it's another story.
If you straight pipe your I6 it will sound like a tractor, just a heads up. I had a I6 with no cat (designed for leaded fuel, hence no cat) and an all but missing muffler. Louder than hell, and sounded like trash. If you think it will sound like a Cummins, Caterpillar, or Detroit, you'll be disappointed.
I agree with ncranchero: The truck and engine were designed with all of this equipment in mind. It was tested for countless hours and evaluated before being mass produced. If it wouldn't be reliable, they wouldn't sell it, their reputation is on the line. Removing functioning cats will not increase power in any way on an EFI engine. If they are clogged or melted, then it's another story.
If you straight pipe your I6 it will sound like a tractor, just a heads up. I had a I6 with no cat (designed for leaded fuel, hence no cat) and an all but missing muffler. Louder than hell, and sounded like trash. If you think it will sound like a Cummins, Caterpillar, or Detroit, you'll be disappointed.
Thread Starter
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Freshman User
Joined: Nov 2011
Posts: 32
Likes: 0
A blocked open EGR will cause a poor idle or a no idle condition. Verify there is a problem before trying to "diagnose" it.
I agree with ncranchero: The truck and engine were designed with all of this equipment in mind. It was tested for countless hours and evaluated before being mass produced. If it wouldn't be reliable, they wouldn't sell it, their reputation is on the line. Removing functioning cats will not increase power in any way on an EFI engine. If they are clogged or melted, then it's another story.
If you straight pipe your I6 it will sound like a tractor, just a heads up. I had a I6 with no cat (designed for leaded fuel, hence no cat) and an all but missing muffler. Louder than hell, and sounded like trash. If you think it will sound like a Cummins, Caterpillar, or Detroit, you'll be disappointed.
I agree with ncranchero: The truck and engine were designed with all of this equipment in mind. It was tested for countless hours and evaluated before being mass produced. If it wouldn't be reliable, they wouldn't sell it, their reputation is on the line. Removing functioning cats will not increase power in any way on an EFI engine. If they are clogged or melted, then it's another story.
If you straight pipe your I6 it will sound like a tractor, just a heads up. I had a I6 with no cat (designed for leaded fuel, hence no cat) and an all but missing muffler. Louder than hell, and sounded like trash. If you think it will sound like a Cummins, Caterpillar, or Detroit, you'll be disappointed.
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Junior User
Joined: Aug 2010
Posts: 95
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From: Canada
I wasn't trying to be rude by that comment... it's just when someone has an honest question about how to go about something like an emissions delete, instead of getting the information they seek, they get a barrage of negative responses. The gov't taxes and takes so much from us, I don't feel one bit of remorse removing govt required equipment. One less thing they can have their greedy little hands on.
I'm sure the op wouldn't have asked if he didn't know the possible consequences. I just see it happen a lot and I feel bad for a guy asking a question out of pure curiousity to get shut down. If my truck can pass emissions in Ontario with no cats or smog pump, and see a small increase in mileage, I would say its worth it and I'm not hurting the environment any more than the next guy with the same truck.
I'm sure the op wouldn't have asked if he didn't know the possible consequences. I just see it happen a lot and I feel bad for a guy asking a question out of pure curiousity to get shut down. If my truck can pass emissions in Ontario with no cats or smog pump, and see a small increase in mileage, I would say its worth it and I'm not hurting the environment any more than the next guy with the same truck.
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Senior User
Joined: Dec 2010
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EFI 300's tend to run best as they left the factory. I suggest leaving the cats or replacing them altogether. I run Magnaflow high flow cats on mine with a matching muffler and 2 1/2 inch pipe. Flows great, sounds great. Take what Ford gave you and enjoy that great engine.
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Freshman User
Joined: Nov 2011
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im going to take the other cat off mainly its too quite. i was just seeing what other related parts i could remove along with the cat, thats all i was asking. i found out from experience that simpler that it is the less issues there tend to be.
The Southernmost Mod
Joined: Dec 2004
Posts: 6,902
Likes: 20
From: Caracas, Venezuela
Don't remove the EGR or air pump (thermactor), you'll regret it, i've done both (mainly because of the lack of spares in my country) and i've won 0 hp and lost around 5 MPG. It isn't worth it and will make your truck illegal on some states (most i think).
Senior User
Joined: Sep 2011
Posts: 127
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From: Sumter, SC
I got rid of the smog pump and all associated hoses, Cats, and AC compressor and lines on my 92. The EGR is so integrated into the EFI system, it would be nothing but trouble if it was removed.
I used a 6 rib, 78.5 inch serpentine belt, and it fit like a glove.
With the exhaust, I welded up a 'Y' from where the cats bolted up to a round 6"x27" Walker tractor muffler. It has a nice little rumble at idle, not too loud upon acceleration, and darn near quiet at highway speeds.
What made me do all of this, is the fact that my cats were clogged so badly, the truck would hardly hit 55 mph, and got about 5 mpgs. Since I got rid of them, I now get around 17 mpg.
I used a 6 rib, 78.5 inch serpentine belt, and it fit like a glove.
With the exhaust, I welded up a 'Y' from where the cats bolted up to a round 6"x27" Walker tractor muffler. It has a nice little rumble at idle, not too loud upon acceleration, and darn near quiet at highway speeds.
What made me do all of this, is the fact that my cats were clogged so badly, the truck would hardly hit 55 mph, and got about 5 mpgs. Since I got rid of them, I now get around 17 mpg.