manifold vacuums
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manifold vacuums
HI there guys I have another problem there are 3 manifold vacuum outlet on my E350 econoline, 351w 5.8l 1987 Ford motorhome. 1 next to the distributor, 1 next to the carburator and 1 next to the EGR valve Well the last one is giving me problems where does it connect and can I just block than one off? The PCV valve has 2 outlets the small one is blocked off but the big outlet is not connected where does that go. It's backfiring and not idling but starting really good. I'm guessing some hoses are not connected at the right place but which ones. I need help guys hope someone can Any info would be greatly appreciated Thanks
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The PCV valve runs to the big port under the front fuel bowl on the carburator.
Are you saying you don't have the EGR connected? If you don't then you can try connecting it to the port in this picture, the one closest to that little metal tag. The factory probably has some weird routing that runs through coolant switches and stuff, but from what I have read it will work like this. If it is already connected then leave it be.
Are you saying you don't have the EGR connected? If you don't then you can try connecting it to the port in this picture, the one closest to that little metal tag. The factory probably has some weird routing that runs through coolant switches and stuff, but from what I have read it will work like this. If it is already connected then leave it be.
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yes the EGR valve is connected . It's the PCV valve big outlet that I don't know where it connects to and the big hose from the back man vacuum next to the |EGR valve on the back of motor Both are major vacuums Sorry if it looks like I don't know much but carb was not my thing. Thanks for the pic Was that a 4180-c holley 4bb?
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yes the EGR valve is connected . It's the PCV valve big outlet that I don't know where it connects to and the big hose from the back man vacuum next to the |EGR valve on the back of motor Both are major vacuums Sorry if it looks like I don't know much but carb was not my thing. Thanks for the pic Was that a 4180-c holley 4bb?
Anyway, back to the PCV. Technically, a PCV valve wants full manifold vacuum; so it will function connected to any port that provides full manifold vacuum. However, the correct place to connect it is on the carb here here:
(The big port obviously)
Second: The big hose you are talking about it, is it connected to the end of *this*
(This would be screwed into the intake manifold bellow the EGR valve basically)
If it is, then it should run to the brake booster. It would be a big hose, bigger than the PCV would need.
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Hi there thanks again for the info. I got it going. One of the hoses in the front of the carb was disconnected. It starts good and idles fine but when in gear it backfires It has no power. The big hose in the back of the motor on the drivers side is still not connected but closed shut. It is a big vacuum hose. Will try to do what you said tomorrow hope it works. The air pump is off Will that prevent the motor from working good? The hoses to the bowl vent are connected but they sort of fold in half. Is it possible to send me a pic on how they should be? Thanks again
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It will run fine without the air pump. I don't know why it would backfire in gear; if it is running correctly when in park. It's most likely a carb issue though, or maybe another vacuum leak. You don't want any uncapped vacuum ports or disconnected hoses.
Here are some pictures of other 4180 setups, I don't know if any of them will help you. I can't find any that are really clear.
If you could upload pictures of your engine it might help, if you have a digital camera and can get the pictures on your computer you can upload them with: imgur: the simple image sharer
Here are some pictures of other 4180 setups, I don't know if any of them will help you. I can't find any that are really clear.
If you could upload pictures of your engine it might help, if you have a digital camera and can get the pictures on your computer you can upload them with: imgur: the simple image sharer
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Hi there I like these pictures. On the first picture you have a white line going to the skinny little outlet above right of the electric choke. Where does that go and for what is it? On the other pic it seems that it is blocked off can we do that on our motor. Is it possible to see the other side of the carb showing the back of the carb with the EGR connected? I see that you have showing on the 2nd pic that the bowl vents have no VTW valve is it ok for us to take does off too. You are being extremely helpful hope to talk to you soon Thanks
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Hi again your 3rd pic did not download I can't see it only the top of picture is visible Thought I'd let you know thanks
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Maybe read through this thread, it may help.
https://www.ford-trucks.com/forums/1...pic-heavy.html
I got that info from another website. It may work by just running a vacuum hose directly from that port to the EGR valve. The other picture that shows that port blocked off, doesn't appear to have an EGR valve. So that explains why they don't have it hooked up. I'm not sure if it will effect the engine negatively by keeping the EGR and not having it hooked up. You can refer to the pictures above, maybe you still have some of the components to set it up correctly?
This post in particular describes how it should be hooked up:
https://www.ford-trucks.com/forums/1...l#post10678187
Is it possible to see the other side of the carb showing the back of the carb with the EGR connected? I see that you have showing on the 2nd pic that the bowl vents have no VTW valve is it ok for us to take does off too. You are being extremely helpful hope to talk to you soon Thanks
As far as the bowl vents and a missing valve, I don't know. Ford made so many different configurations that some may have came with them, and some without; so if you have them I would just leave them.
http://www.fullsizebronco.com/forum/...1&d=1145502411
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Hi again! My setup is not quite like the ones you are showing me on the pics. I will try to take a pic of my motor and send it on to you. One of the hoses was cracked I fixed it but still no power. I'm looking to find the vacuum advance to see if it is connected right Will take a look at it tomorrow. If you have pics of that it would be great. Talk soon
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It may be time for a carb rebuild, even with some issues it should have some power.
I don't have any pictures that clearly show how the vacuum advance connects, but it is one of the simplest ones.
For your average factory deal it can be two different ways. A hose connected to the distributor and ran directly to the long skinny port under the front fuel bowl of the carb. (As seen in this picture: http://image.mustang50magazine.com/f...acuum_port.jpg)
The other way is through a coolant vacuum switch. It may be different for your vehicle, but on a Holley 4180 equipped Mustang there is a green vacuum switch screwed into the intake; with three ports. In this case, the hose from the distributor would connect to the middle port. The long skinny port on the carb as pictured above would connect to the bottom port, and the top port would connect to any vacuum source that provides full manifold vacuum.
I don't have any pictures that clearly show how the vacuum advance connects, but it is one of the simplest ones.
For your average factory deal it can be two different ways. A hose connected to the distributor and ran directly to the long skinny port under the front fuel bowl of the carb. (As seen in this picture: http://image.mustang50magazine.com/f...acuum_port.jpg)
The other way is through a coolant vacuum switch. It may be different for your vehicle, but on a Holley 4180 equipped Mustang there is a green vacuum switch screwed into the intake; with three ports. In this case, the hose from the distributor would connect to the middle port. The long skinny port on the carb as pictured above would connect to the bottom port, and the top port would connect to any vacuum source that provides full manifold vacuum.
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