smog pump delete
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1st Gear
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smog pump delete
so my smog pump on my 1986 ford f150 4.9 inline 6 stopped working and the hoses are just breaking apart causing a vacuum leak. I took the belt off and it has run better minus when it's cold. I'm honestly just looking for recommendations for how to delete the smog pump. People keep telling me I need to get a new exhaust manifold and intake manifold. Is that true and possibly a carb?
Lead Driver
Joined: Apr 2002
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so my smog pump on my 1986 ford f150 4.9 inline 6 stopped working and the hoses are just breaking apart causing a vacuum leak. I took the belt off and it has run better minus when it's cold. I'm honestly just looking for recommendations for how to delete the smog pump. People keep telling me I need to get a new exhaust manifold and intake manifold. Is that true and possibly a carb?
You'll have to make decisions on your ignition and carburetor as you probably have a feedback unit. But you're in luck as there are several here that have done those changes and I'm sure they'll chime in...
Moderator
Joined: Jan 2001
Posts: 56,966
Likes: 2,728
From: Virginia
Most people just take everything off, but leave some of the piping. I think piece #9A487 is a check valve. It lets the air pump push air into the exhaust manifold, but doesn't let exhaust come back out. If your check valve is working, you can just leave it on there and drive on. What I have seen happen though, without the air pump working exhaust gases and the condensate they create will eventually eat out the check valve, yours may be already gone. If it is, you can try to cap it somehow so it doesn't leak exhaust. Once you get it capped, you should be alright for several years, until one of the pipes gets a hole in it from corrosive gases from the exhaust. But this may take awhile, you might have many years before that happens. Not sure what you would need to take the pipes off and plug the holes.
Mountain Pass
Joined: Oct 2019
Posts: 125
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Richie the wrench 🔧
I'm not sure about the 300 configuration smog pumps, but on a 350 GM engine the smog pump I had provided back pressure to the exhaust manifold. When I deleted the pump I plugged the manifold threaded holes with brass plugs. It was a nice look too.
You'll have to make decisions on your ignition and carburetor as you probably have a feedback unit. But you're in luck as there are several here that have done those changes and I'm sure they'll chime in...
You'll have to make decisions on your ignition and carburetor as you probably have a feedback unit. But you're in luck as there are several here that have done those changes and I'm sure they'll chime in...
Lead Driver
Joined: Jun 2021
Posts: 5,215
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Not sure about i6 but would love to have one in bullnose what a truck. My red truck 86 is 5.o 302 EFI no smog pump no cat but O2 sensor and EGR valve hooked up still running off computer and bought the bracket to eliminate the Factory smog pump bracket to spruce up the engine bay
Mountain Pass
Joined: Oct 2019
Posts: 125
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Richie the wrench 🔧
Speaking for myself I love good things I just never had a 300 in line 6 in one of these bullnose trucks and would love to have one. What the 300 would do for me would be a reliable economical Workhorse and they sure are pretty underneath the hood down in that engine bay and they have a nice sound to. And look how far back in line 6 goes with Fords. When I said I'm not sure about 300 I'm just not sure how to eliminate some of the factory emission systems hanging all over the engine but like one fellow stated in here there's somebody in here that knows how to get around some of that old Hardware.
FTE Legend
Joined: Nov 2015
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From: Angier, NC
Wish I could say how but mine was removed before I got my truck so I dont know how the factory had it.
I also went with EFI EXH manifolds with the factory intake manifold and v1 carb.
The only thing I had to do then was remove and plug the openings for the EGR tube.
Now I dont think I have seen the setup the Dave posted on a 300 six where the air goes into the head.
If so I dont remember seeing one. Think most had a tube that went down to the cat and added the air there?
Either one if you have gases coming back up you will need to cap / plug it.
Some cut the tubes, crimp and fold over the ends to stop the gas from coming out.
In the head like Dave shows if you can get the fittings out of the head some use plugs.
Dave ----
I also went with EFI EXH manifolds with the factory intake manifold and v1 carb.
The only thing I had to do then was remove and plug the openings for the EGR tube.
Now I dont think I have seen the setup the Dave posted on a 300 six where the air goes into the head.
If so I dont remember seeing one. Think most had a tube that went down to the cat and added the air there?
Either one if you have gases coming back up you will need to cap / plug it.
Some cut the tubes, crimp and fold over the ends to stop the gas from coming out.
In the head like Dave shows if you can get the fittings out of the head some use plugs.
Dave ----
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6th Gear
Joined: Mar 2023
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From: Los Angeles
Most people just take everything off, but leave some of the piping. I think piece #9A487 is a check valve. It lets the air pump push air into the exhaust manifold, but doesn't let exhaust come back out. If your check valve is working, you can just leave it on there and drive on. What I have seen happen though, without the air pump working exhaust gases and the condensate they create will eventually eat out the check valve, yours may be already gone. If it is, you can try to cap it somehow so it doesn't leak exhaust. Once you get it capped, you should be alright for several years, until one of the pipes gets a hole in it from corrosive gases from the exhaust. But this may take awhile, you might have many years before that happens. Not sure what you would need to take the pipes off and plug the holes.
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Lead Driver
Joined: Jun 2013
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From: Tolland, CT
https://www.garysgaragemahal.com/
On that site, click on the "Documentation" link, then electrical, then EVTM.
https://www.garysgaragemahal.com/1981-evtm.html
On that site, click on the "Documentation" link, then electrical, then EVTM.
https://www.garysgaragemahal.com/1981-evtm.html
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