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finally realized a bit of a dream and picked up a beauty of a truck in a 1990 Ford F-150 with the 5.0 302 windsor. Super rust free and all original. Wasn't really in the market right now but you know how it is when you roll past something that definitely needs to be preserved. I replaced the transmission, new exhuast manifolds and gaskets, new alternator, egr valve, valve cover gaskets, muffler, cat converters, and etc.
The old owner had melted some of the vacuum tubes and drive it around running rich and plugged up the exhaust. I replaced and retraced all the vaccum lines but am super desperate to find a vacuum line diagram so I can put it back together properly. I ordered a air diverter valve. But I need a map on how to get the vacuum system hooked up properly.
Its so close to running good. I feel im at the last step. If there is anybody out there that can help me get the vacuum system running correct please help me!!!
So the valve at the top labeled 'ACV'. Im assuming thats the air diverter valve. Where from the engine does the dotted line come from?
This diagram really helps thanks so much
Yes, you are right.
I was gonna say that I'd never heard of this ACV or BPV, but those denote your Dump Valve and Bypass Valve, after studying the diagram. The TAD and TAB control those respectively.
The dotted line denotes the vent line from the fuel tank(s). You can see that it passes through the charcoal Evaporative canister and and into the intake air stream. The diagram seems to be missing the Purge Solenoid - I'm pretty sure trucks have those...
Follow the hose up from the canister to your engine to see where it goes. I am not familiar with the truck EFI intakes, but I know that the line goes to the upper intake manifold on a Fox Body 5.0.
This is from a related thread I found when trying to edit my post, LOL...
And one more word of advice in case you are totally replumbing the vacuum system, make sure to use a dedicated line from the manifold for the MAP sensor, as those can be very sensitive.
I was looking at a different picture when replying sorry.
What I meant to ask is on the 'ACV' valve, there is one tube that goes to the cat. Then there is another tube that goes to engine. Where on the engine does this tube hook up to?
I was looking at a different picture when replying sorry.
What I meant to ask is on the 'ACV' valve, there is one tube that goes to the cat. Then there is another tube that goes to engine. Where on the engine does this tube hook up to?
Air is either directed to the catalytic converter to help warm them up faster or to the back of the cylinder heads.
I was looking at a different picture when replying sorry.
What I meant to ask is on the 'ACV' valve, there is one tube that goes to the cat. Then there is another tube that goes to engine. Where on the engine does this tube hook up to?
On some engines, the tube to the engine goes to the back of the cylinder heads. The Secondary Air gets pushed into a passage which injects the air at all four exhaust ports in that head. That's your Upstream Air, with Downstream being the cat.
Later small block Fords did it differently, at least on the Mustang - I don't think they used that Upstream Air tube, like Fox Bodies did.
The bulging thing at the end of the tube where the rubber hose connects, is a check valve.
dang that picture is beautiful and super thanks. I wish I would have done this while I had the manifold off to change valve gaskets but oh well on that.
Last question (because my part is burned pretty badly). There is the vacuum tube from TAB Sol on the top plugged in. Big hose to the check valve, and other big hose goes to the tube to the smog pump. Got those down pat. BUt I should have another vacuum hookup from TAD Sol to the ACV Diverter valve. IN the picture is that the vacuum tube on the left side of the left red arrow and it seems to go in front of the acv diverter. Am I seeing that right? So the acv diverter I need has two vacuum ports right?
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