Removing emmisions?
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Senior User
Joined: Oct 2011
Posts: 142
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From: CT
Removing emmisions?
My truck passed emissions for the last time and i have heard of guys removing emmisions things from there truck once they dont have to go to emmisions anymore. My question is would it be good to remove any emissions systems from my truck or should i just leave it alone. If it is ok then what could i remove and how. The truck is an 88 f250 351w.
More Turbo
Joined: Jan 2012
Posts: 629
Likes: 85
From: VT
You could but if it works fine then I'd say just leave it. The only reason my truck is missing most of the emissions stuff is because it rotted off and I didn't want to spend money on it. But if's working fine I would say "if it ain't broke don't fix it" 
Cargo Master
Joined: Jul 2011
Posts: 2,000
Likes: 4
From: Nowthen, MN
I would leave it alone. I've never understood why people are so obsessed with removing all the emissions stuff. There really is nothing to gain by removing it. The engine is designed to run with it there, so removing it can actually do more harm than good.
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Senior User
Joined: Oct 2011
Posts: 142
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From: CT
Well the thing is the stuff is rotting off. The check valves in the air hoses are all rotted and i just have a bunch of loose hoses hanging around. It makes it sound like i have a bad exhaust leak.
More Turbo
Joined: Jan 2012
Posts: 629
Likes: 85
From: VT
You can get a shorter belt at an auto parts store to bypass the smog pump.
Then just disconnect everything else and plug the vacuum lines. Mine had a small (1/2" or so) pipe on the back of the heads that was connected to the exhaust somehow and made a lot of noise until I plugged the holes with bolts.
Then just disconnect everything else and plug the vacuum lines. Mine had a small (1/2" or so) pipe on the back of the heads that was connected to the exhaust somehow and made a lot of noise until I plugged the holes with bolts.
Senior User
Joined: Nov 2010
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In the case of the modern diesels there is a lot to gain both in reliability and efficiency by removing emissions equipment. EGR is a bad thing for diesels, how could pumping hot air into the intake to make combustion less efficient be good for an engine? Diesel particulate filter systems haven't been very good either causing all sorts of oil dilution problems and flat out wasting fuel to regenerate the systems. I am not going to say that removing emissions equipment is always good, but there are very good reasons to remove emissions equipment in some cases.
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pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
If it sounds like you have an exhaust leak examine the A.I.R. check valve at the back of the intake manifold and the crossover pipe going to the back of each head.
If it is rusted through you can plug the heads with a short 5/8-11 bolt.
EDIT: I see Glen beat me to it. That's what happens when you have too many threads opened in tabs..
If it is rusted through you can plug the heads with a short 5/8-11 bolt.
EDIT: I see Glen beat me to it. That's what happens when you have too many threads opened in tabs..
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More Turbo
Joined: Jan 2012
Posts: 629
Likes: 85
From: VT
If it sounds like you have an exhaust leak check the A.I.R. check valve at the back of the intake manifold and the crossover pipe going to the back of each head.
If it is rusted through you can plug the heads with a short 5/8-11 bolt.
EDIT: I see Glen beat me to it. That's what happens when you have too many threads opened in tabs..
If it is rusted through you can plug the heads with a short 5/8-11 bolt.
EDIT: I see Glen beat me to it. That's what happens when you have too many threads opened in tabs..
Fleet Mechanic
Joined: Jun 2011
Posts: 1,324
Likes: 3
From: Conway, South Carolina
It can be done. I don't have any cats, egr, or smog.
The cat was clogged, so I took it off. A.I.R check valve was rotten again, and yes I have replaced it before. So I got rid of the egr and crossover pipe. Then I just went ahead and took off the smog. Didn't figure it was doing any good anyway, since the rest was gone.
Its just two bolts that hold the smog pump off, and it get it completely out of the way.
The cat was clogged, so I took it off. A.I.R check valve was rotten again, and yes I have replaced it before. So I got rid of the egr and crossover pipe. Then I just went ahead and took off the smog. Didn't figure it was doing any good anyway, since the rest was gone.
Its just two bolts that hold the smog pump off, and it get it completely out of the way.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
It is a federal violation subject to a $2500 fine for the first offense, and up to a $10,000 fine... if, you are a dealer or licensed repair shop.
Prison is never mentioned.
And a felony is a crime punishable by a (possible) term of more than 1 year.
http://itep68.itep.nau.edu/itep_down...onControls.pdf
New User
Joined: Apr 2012
Posts: 8
Likes: 0
i don't understand why anyone would want to reroute burnt exhaust back into your intake, think of all the carbon unburned fuel that is being dumped back into your system, I say take it all off, my runs great without that junk on there, and think of the efficiency that can be gained by not turning the smog pump anymore, remember its a small air compressor. when running its trying to push air into the system (with no filter).
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
It is a vane type pump, and has, or should have, a filter.
EGR is there to control combustion temperature and allow a leaner mixture.
The automotive companies didn't make these rules.
They just did their best to comply with them in order to be able to continue selling cars.
EGR is there to control combustion temperature and allow a leaner mixture.
The automotive companies didn't make these rules.
They just did their best to comply with them in order to be able to continue selling cars.
Laughing Gas
Joined: May 2004
Posts: 1,062
Likes: 6
From: Dallas, TX, USA
Nowhere is it a felony.
It is a federal violation subject to a $2500 fine for the first offense, and up to a $10,000 fine... if, you are a dealer or licensed repair shop.
Prison is never mentioned.
And a felony is a crime punishable by a (possible) term of more than 1 year.
http://itep68.itep.nau.edu/itep_downloads/~GeneralAQInfo/Pollutants_Sources_Controls/Mobile%20Sources/DontTamper_EmissionControls.pdf
It is a federal violation subject to a $2500 fine for the first offense, and up to a $10,000 fine... if, you are a dealer or licensed repair shop.
Prison is never mentioned.
And a felony is a crime punishable by a (possible) term of more than 1 year.
http://itep68.itep.nau.edu/itep_downloads/~GeneralAQInfo/Pollutants_Sources_Controls/Mobile%20Sources/DontTamper_EmissionControls.pdf
<cite>www.arb.ca.gov/msprog/aftermktcat/installcatq&a.pdf</cite>