DS2 conversion and the EGR
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DS2 conversion and the EGR
Long term lurker, first time poster.
I have a 1986 F150 4x4 with a 4.9L straight six. The trucks wiring was/is a mess with too many loose ends to count.
Thanks to all the help from this forum I was able to install the DS2 ignition system without any problem.
Most of the emissions controls appear to have been removed or disabled. I don't live in a state that requires emissions tests, so my primary goal is to have a reliable truck and to keep things simple.
My question is does the EGR still work without the computer, now that I've swithed to the DSII.
If it does work, what changes need to be done?
If it doesn't work, what do I need to do to remove it? (spacer,etc?)
I have the same questions for the vapor canister as well.
Please keep in mind I am a real novice.
Thanks in advance for any help you can offer.
I have a 1986 F150 4x4 with a 4.9L straight six. The trucks wiring was/is a mess with too many loose ends to count.
Thanks to all the help from this forum I was able to install the DS2 ignition system without any problem.
Most of the emissions controls appear to have been removed or disabled. I don't live in a state that requires emissions tests, so my primary goal is to have a reliable truck and to keep things simple.
My question is does the EGR still work without the computer, now that I've swithed to the DSII.
If it does work, what changes need to be done?
If it doesn't work, what do I need to do to remove it? (spacer,etc?)
I have the same questions for the vapor canister as well.
Please keep in mind I am a real novice.
Thanks in advance for any help you can offer.
Elder User
Joined: Feb 2012
Posts: 709
Likes: 2
well..
If you're trying to build an "off-raod" tractor, it can be done quite easily, but not many here would recommend it I imagine. (regulations). If you choose to use the egr, you need to "place the engine in a 77 or so" vin numbered frame and find an emissions sticker that shows the vacuum diagram to hook it up per year. (basically a temp controlled vac switch hooked to the spark port.) If you do THIS the diagrams should help you hook up the appropriate vap canister as well year specific.
If you decide not to use the egr on your off-road tractor..you may need to get creative to weld up a few things etc..no guranatees of particular performace here if you do so..best wishes
If you decide not to use the egr on your off-road tractor..you may need to get creative to weld up a few things etc..no guranatees of particular performace here if you do so..best wishes
Moderator
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From: Virginia
Trace the vacuum line that went to the EGR. If you don't have it, then look at the diagram. EGR's that where computer controlled usually have a electrical vacuum solenoid in the vacuum line to the EGR to control it.
It's pretty safe to say though, that now the computer is not getting any rpm info from it's original distributor, it's probably not doing anything now, including controlling the carb. You might want to think about swapping the carb out if you haven't already.
It's pretty safe to say though, that now the computer is not getting any rpm info from it's original distributor, it's probably not doing anything now, including controlling the carb. You might want to think about swapping the carb out if you haven't already.
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Thanks for the replies.
I changed to a non-feedback Carter YFA carburator as part of the DSII upgrade.
It looks as though the EGR was controlled by the computer, so now that I don't have the computer I'm trying to figure out what I need to do with the EGR and the Vapor Canister system.
I'm wondering what other people have done after they did the DSII upgrade?
I changed to a non-feedback Carter YFA carburator as part of the DSII upgrade.
It looks as though the EGR was controlled by the computer, so now that I don't have the computer I'm trying to figure out what I need to do with the EGR and the Vapor Canister system.
I'm wondering what other people have done after they did the DSII upgrade?
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
I blocked the EGR off on an '82 351W since the PO had removed the inputs to the computer and it wasn't controlling anything, including the EGR. So blocking it off didn't change anything in my case, but at least it couldn't leak when blocked off.
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From: Virginia
I can't remember if we had a discussion on this or not, but it would be nice to keep the canister system. It takes the fumes from the gas tank and stores them till later when the engine can burn them. If you disconnect it, you get a little gas smell in the engine compartment, since the gas tank will be venting out of the line that went to the canister.
I am thinking if there is a solenoid in the canister line, that anytime the key is on, this solenoid can be opened and a small line can be hooked to the same place as the PCV valve. Most PCV valves have a small nipple for this purpose. I am not sure if this is all it takes to make it work, but I would try to keep it going. Same as the heat system for the aircleaner, I would keep it hooked up also.
I would block the EGR off, but keep an ear out for pinging.
I am thinking if there is a solenoid in the canister line, that anytime the key is on, this solenoid can be opened and a small line can be hooked to the same place as the PCV valve. Most PCV valves have a small nipple for this purpose. I am not sure if this is all it takes to make it work, but I would try to keep it going. Same as the heat system for the aircleaner, I would keep it hooked up also.
I would block the EGR off, but keep an ear out for pinging.
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Moderator
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From: Virginia
You can't block it off, that's the problem. The gas tanks need to breath as they warm up and cool off, and also need to let air in as the engine pulls the fuel out. In the old days, they had vented caps on the tanks that let the tank breath, and all the fumes went out in the atmosphere.
The only thing you can do is leave the line open that comes up along the pass side frame rail, and like I said you will get a little smell out of it.
The only thing you can do is leave the line open that comes up along the pass side frame rail, and like I said you will get a little smell out of it.
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FTE Legend
Joined: Jul 2010
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From: Northeast, OK
Make/buy a plate that will fit in place of the EGR valve and use a gasket on it. Here's a picture of how I did it. Just left (behind the way the engine would be mounted) of the carb mounting position you'll see the EGR spot and a black plate I made to replace the EGR valve.
Cargo Master
Joined: Mar 2008
Posts: 2,565
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From: Washington
I just used a thin piece of Aluminium between the EGR and the mounting plate. The aluminium will last a few years. I used beer cans as my parts source as I seem to have a good supply on hand. 
Jim
Jim
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