removing old smog stuff
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Senior User
Joined: Feb 2005
Posts: 146
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From: Lewiston
removing old smog stuff
A friend of mine bought a 78 F150 short box, with a 351M. He wants to take of the old smog lines. What lines need to be left on and what lines can be removed.
Thanks
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Posting Guru
Joined: Dec 2009
Posts: 2,134
Likes: 1
From: Mississippi
Assuming there are no inspections to pass, then what can he remove? I posted the same question on the fe board and didnt get a response so I'm curious also.
Senior User
Joined: Apr 2010
Posts: 115
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From: Near Providence, RI
I've been doing a lot of forum searches myself and came accross answers to your questions. It looks like if it's an egr-equipped engine then it really needs to have the egr itself still functioning as the engine is timed/tuned to expect that mix of gases, but other than egr I think the rest can go.
If it's a non-egr engine then it's much simpler, I think all you "have" to have hooked up is the vacuum advance and the choke pull-off, plug everything else!
Again, I'm no expert, this is just the jist of what I sort of picked up on. I'm sure someone else can give you specifics (and tell me I'm totally wrong
)
If it's a non-egr engine then it's much simpler, I think all you "have" to have hooked up is the vacuum advance and the choke pull-off, plug everything else!
Again, I'm no expert, this is just the jist of what I sort of picked up on. I'm sure someone else can give you specifics (and tell me I'm totally wrong
)
Cargo Master
Joined: Apr 2009
Posts: 3,038
Likes: 4
From: South west Idaho
I live at the south end of idaho and we do have a couple of countys that test, but they are for 1980 or newer. I took all of it off of my 79, but I'm not sure if I need to hook the egr. back up or not. I'm going to try to get more information about it. 
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
I'm glad to see people are taking the time to research this the right way; kudos to you all. 
Some helpful info: https://www.ford-trucks.com/forums/9...ml#post8773097
Some helpful info: https://www.ford-trucks.com/forums/9...ml#post8773097
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New User
Joined: Apr 2010
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Similar issue
Having a vacuum leak from a (rusted out) valve? fitting? stem? located on rear driver's side just above the exhaust manifold. The line ran to some emission control stuff that looks like its been diconnected. Can't find a replacement. The stem is about 4 inches and looks flared at the end. Any idea what this is? Best solution?
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MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
I have never personally heard of any problems with removing the smog pump (A.I.R. injection system) so long as you cap the vacuum port to the diverter valve. By the same token, though, I don't know of any problems with keeping it, unless there's some power loss by having your accessory drive run the smog pump (which I can't see as being much). On the other hand, it takes quite a bit of space and can get in the way.
I don't think a '73 would have a smog pump, though. A '73 could have EGR, though, and as seafire says it needs to stay. It's not a matter of having it tested, it's a matter of the way the engine is set up.
I don't think a '73 would have a smog pump, though. A '73 could have EGR, though, and as seafire says it needs to stay. It's not a matter of having it tested, it's a matter of the way the engine is set up.
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