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1 26th February 07:52
External User
 
Posts: 1
Default 1978 f250 pickup with 390 engine... vacuum diagram?


Hi,

It looks like someone put vacuum lines on this engine incorrectly.

There are the two temp operated vacuum switches in the water
flange on top of the engine.
distributor vacuum advance (no retard)
charcoal canister,
EGR
breather
valve cover vacuum
ports on intake (a bunch of them)

looking in the crappy chiltons manual, it shows the dist., with
a line coming off it, going to a T, then to the carb and to one of
the temp switches... this is definitely not the way it goes right
now.

it goes dist-->temp switch. from temp switch it branches to two
ports on the carb.

I would like a good description of the vacuum system.

right now the EGR isn't hooked up. the breathers on the valve
covers aren't connected.

It will start, sounds pretty good. It dies about 2 seconds after
keeping it revved a bit... it won't stay lit.

I'll take a picture with my digital camera and post it on a website,
and repost here to see if anyone can help.

two barrel carb... pics are a thousand words so I'll stop typing
and start getting snapshots

any assistance is appreciated!

Rich
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2 26th February 08:16
kevin
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Posts: 1
Default 1978 f250 pickup with 390 engine... vacuum diagram?


Are you sure its not a 77? that is the last year of the FE engs in the
ford pkups. If it is truly a 78 then it probly is not a 390. KB

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3 26th February 08:17
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Posts: 1
Default 1978 f250 pickup with 390 engine... vacuum diagram?


Not sure what year it is... I'll check next time I'm there...
I'll take pics too

passenger side of engine block, in the exhaust manifold, is
a plate with two metal pipes sticking out (vacuum)... the bottom
of the plate is a coil of pipe that hangs into exhaust manifold,
I'm assuming for preheating the air that gets vacuumed through
it....

does anyone know where this is supposed to go? IE where
do the other end of the hoses go?

Rich
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4 26th February 08:18
kevin
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Posts: 1
Default 1978 f250 pickup with 390 engine... vacuum diagram?


that is the heated air intake for the choke coil. one end is open the
other goes into the choke housing on the carb. it is a insulated hard
line. KB

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THUNDERSNAKE #9

Protect your rights or "Lose" them
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5 26th February 15:55
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Posts: 1
Default 1978 f250 pickup with 390 engine... vacuum diagram?


how about drivers side valve cover breather? do you know
where that goes?
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6 26th February 15:55
scottm
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Posts: 1
Default 1978 f250 pickup with 390 engine... vacuum diagram?


On Feb 21, 7:38 pm, Kevin <kevyNOS...@netins.net> wrote:


how about drivers side valve cover breather? do you know
where that goes?

Is it the PCV your talking about? About 3/4 inch diameter. If so it is a
large hose that goes to manifold vacuum usually on the carb.

It could just be a breather vent. Larger than the PCV and it will most
likely go the air cleaner with a small filter inside the air cleaner. I
recall a square hole, about 1 inch, in the cleaner where the nipple goes
through then u attach the filter with a clip gizmo. Then the hose just
slides over the nipple.

I guess if the truck wasn't built for California it could just have a vented
cap on the valve cover vent. Just guessin here.
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7 26th February 16:21
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Posts: 1
Default 1978 f250 pickup with 390 engine... vacuum diagram?


Yeah, PCV valve... on the drivers side valve cover. Has black
2 nipple connector, one of the nipples doesn't have a hole
in it (factory didn't drill it out)... fairly large hose going
nowhere
right now...

manifold vacuum... do you know where exactly? I can hear
a hell of a vacuum leak, and this must be it (According to the
size of the hose... that is a big port on the carb or manifold
which is ****ing air right now)


Distributor: has vacuum advance.

it is connected to red vacuum valve on the water flange. Is
this correct? then from that valve to two different ports on
the carb...

I can't find a vacuum diagram ANYWHERE for this truck..
none of the manuals at the auto parts store, none of the
archive sites, nowhere on the net, can't even find a torrent!

Rich
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