IAC Valve question
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
The vacuum reservoir on the passenger side fender has a check valve in it. When manifold vacuum is lower than the stored vacuum it should shut off. It should hold vacuum indefinitely if the load side vacuum port is plugged off. With something connected, it's tough to say how long it will hold vacuum.
This is why I use a small handheld vacuum pump/gauge to test each vacuum circuit and component. Eliminates a lot of guess work.
This is why I use a small handheld vacuum pump/gauge to test each vacuum circuit and component. Eliminates a lot of guess work.
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Elder User
Joined: Oct 2013
Posts: 505
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From: Independence
Yeah the one on the left side goes to the manifold and the egr solenoid i put a tee to go between the manifold and egr solenoid the other is capped off it went to the TAD and TAB solenoids will post a pic of that ok
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Elder User
Joined: Oct 2013
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From: Independence
Why is that? Thats basically the way it was except the other side went to the TAD and TAB solenoids you said i could remove those vacuum hoses that went to the solenoids if i didnt cap off that other side it would leak, right maybe i should run the other side to the egr solenoid? You think or no
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Elder User
Joined: Oct 2013
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From: Independence
This what the old one looked like where i put the tee i showed u then the single plastic line ran directly to the left side of the reservoir, so i dont understand what went wrong? Maybe honestly i guess i must just be an idiot
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
When I had to re-do some of the vacuum lines on my old '92 F350 I used the upper vacuum chamber as described above. The lower was re-purposed for the HVAC system.
Just make sure that coffee can is not open to atmosphere.
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Elder User
Joined: Oct 2013
Posts: 505
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From: Independence
Ok im sorry man maybe i should just get a new VRES, u think? Im just want an opinion on that? Or since i don't have a vac pump, should i spray carb cleaner or something over it to see if it changes anything? I do have a VAC. tester could i use it on the other side that's capped off to see how much vacuum it has there? Thanks for your help man!!! I really do appreciate it!
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Elder User
Joined: Oct 2013
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From: Independence
Oh and also I didn't know of any other way to hook that together but with a tee if you have another suggestion, i would appreciate it on how u would've done it, so it doesnt look like crap!!! Or might throw a EGR code! Thanks again!!!
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Elder User
Joined: Oct 2013
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From: Independence
Is there any thing i can actually do with my vacuum pressure gauge tester for vacuum leaks? Or no? Its not a pump just a vacuum pressure tester thanks for the input! If not what is this good for, Anything? Maybe the trash can? Lol thanks again!!!
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
Run the manifold vacuum line to the input of the VRES. Run the EGR vacuum line to the output of the VRES. Eliminate the y/t completely.
I will warn you again..those metal cans are notorious for rusting through. Remove it, then thoroughly inspect.
I will warn you again..those metal cans are notorious for rusting through. Remove it, then thoroughly inspect.
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Elder User
Joined: Oct 2013
Posts: 505
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From: Independence
Will do, i thought about that yesterday. I thought I said something about it. Maybe not either way, i will run it that way and will look at the VRES! But i could be lucky and nothing wrong with them, even though they are old! But not likely! But 1 could hope!