What is this?
Thread Starter
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Tuned
Joined: Jan 2013
Posts: 419
Likes: 1
From: Oklahoma City
What is this?
I have had this truck since september but still have not figured out what this is. Truck is a 1978 F250 460 with a motorcraft 4350 carburator. It has some black electric tape wrapped on it since I bought it.
For a location view of it, it is on the passengerside valve cover in the middle of it.
Any help would be great!
For a location view of it, it is on the passengerside valve cover in the middle of it.
Any help would be great!
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
That looks like an electric vacuum solenoid. Those were pretty common in some of the more complicated pullover-type EGR or distributor advance control systems that took speed and ambient temperature into account. Could be wrong though.
Not it. That's a completely different animal.
Not it. That's a completely different animal.
Thread Starter
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Tuned
Joined: Jan 2013
Posts: 419
Likes: 1
From: Oklahoma City
Pulled it off, part number is pretty much gone off the part except D5somethingE with some other stuff underneath the D5.
It was only held on with 2 7/16 nuts, has two vaccum lines out the front that are not connected to anything.
Anyone else have a idea? Of what this is or what it connects to.
It was only held on with 2 7/16 nuts, has two vaccum lines out the front that are not connected to anything.
Anyone else have a idea? Of what this is or what it connects to.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
In the limited cases I've seen, it's controlled via an amplifier under the dash, and interrupts a vacuum signal to the EGR valve (or something upstream), or somewhere upstream of the distributor vacuum advance. Your best bet is to look up the appropriate emissions diagram.
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Logistics Pro
Joined: Feb 2000
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From: Mesa
Now see I have always wanted to know what those stupid brackets were for on the valve covers. Now I know. 
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Senior User
Joined: Apr 2012
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From: San Diego, CA
I think FMC400 is correct, vacuum solenoid, on my '78 460 is next to the vacuum amplifier and has to do with the EGR operation and maybe throttle kicker? Funny just this morning I was wondering if I could hook the EGR up directly to PVS and omit the amplifier and this solenoid.
This is with the old 4350 since replaced with a holley 4160, but you can see the solenoid with a little "cap" on it next the vacuum amplifier.
This is with the old 4350 since replaced with a holley 4160, but you can see the solenoid with a little "cap" on it next the vacuum amplifier.
Thread Starter
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Tuned
Joined: Jan 2013
Posts: 419
Likes: 1
From: Oklahoma City
I think FMC400 is correct, vacuum solenoid, on my '78 460 is next to the vacuum amplifier and has to do with the EGR operation and maybe throttle kicker? Funny just this morning I was wondering if I could hook the EGR up directly to PVS and omit the amplifier and this solenoid.
This is with the old 4350 since replaced with a holley 4160, but you can see the solenoid with a little "cap" on it next the vacuum amplifier.
This is with the old 4350 since replaced with a holley 4160, but you can see the solenoid with a little "cap" on it next the vacuum amplifier.
Senior User
Joined: Apr 2012
Posts: 335
Likes: 0
From: San Diego, CA
I had mine hooked up per that post and it ran pretty well.
I have searched for a vacuum diagram for mine extensively and come up with some that seem pretty close but nothing that is an exact fit. I know there were several for each engine depending on vehicle weight, year, and options.
Last edited by TexinCali; Jan 8, 2014 at 06:18 PM. Reason: added info