New to forum, need help with '72 F250

[jpilgrim]

Additional clue

Wow, you guys are very helpful. Thanks!

Here's another clue:
There's a metal tube coming off of the passenger side exhaust manifold, and going to the carb, that seems to be detached:

I looked through my '72 Truck shop manual but couldn't find what it was.

What is it and could this be the source of some of my troubles.

To respond to some of your questions:

The engine cranks fine and the carb seems to be getting sufficient gas. Some of the cylinders are firing but from the sound and feel, not all are.
Also, the car lives parked on a hill--passenger side uphill, drivers side down. And the gas blowing out of the exhaust manifold seal is on the downhill side.

Lemme know what you think and what that tube is.

Thanks again!
John

 

[TexasNomad]

Whoa, I"ve never seen that before.
That doesn't looks factory to me, but I don't know much about the 360.
I would say it has some thing to do with the EGR?.
But truly that one has me stumped..

 

[jpilgrim]

if you re-read my post. I never got to watch the videos, FireFOx kept crashing when i tried.

Try this video, it's a different video codec:
http://johnpilgrim.net/FordF250/FordF250_3Mar09b.avi

John

 

[TexasNomad]

I looked at all my books and did was looking around on google images and nothing.
I have a feeling that might be some thing some body added..
Can you fallow the line back on to the carb and shoots some more pics?
That would help greatly to see what its plugged in to?

 

[jpilgrim]

Tube destination

Can you fallow the line back on to the carb and shoots some more pics?
That would help greatly to see what its plugged in to?

From the passenger side of the carb:

From the driver side of the carb:

(sorry for the blurry pic)

I'll try to get a better shot of exactly where the tube enters the carb.

--JP

 

[TexasNomad]

From the passenger side of the carb:

From the driver side of the carb:
--JP

Never seen any thing like that before.
Guys? any ideals?

 

[A_G]

Try this video, it's a different video codec:
http://johnpilgrim.net/FordF250/FordF250_3Mar09b.avi

John

thanks for the try but all i got was sound.

that line seriously looks like an additional fuel line. ive seen some carbs with dual fuel hook ups. but i dont know. vent line maybe?

 

[TexasNomad]

t
that line seriously looks like an additional fuel line. ive seen some carbs with dual fuel hook ups. but i dont know. vent line maybe?

That's what i was thinking a vent line, but why on earth would it be hook in to the Exhaust manifold? some kinda weird Emissions thing?

 

[A_G]

That's what i was thinking a vent line, but why on earth would it be hook in to the Exhaust manifold? some kinda weird Emissions thing?

dunno. Didnt think those trucks had emmissions on them, but ive never seen a california bumpside in person, since they did or should have had some sort of emmission controls on them

 

[1985 Ford F-150]

I think its a heat riser thing to warm the motor up. My cj 5 has somethin similar.

 

[Fellro]

It is to the choke coil to get the choke to release by warming it.

 

[jpilgrim]

Update and Resolution!

Hi all,
Thanks for all your input this week. It really helped me get up to speed on what to be looking at.
Had my truck towed to the mechanic this morning and got it back this afternoon.
Fortunately the problems weren't too deep. Compression tests indicated that the engine was still sound.
The choke was stuck closed and a piece had broken off, which was making the float stick.
So way too much gas and not enough air.
And the exhaust manifold gasket was old and failing at most cylinders.
So the choke was replaced with a used one, the carb cleaned up but not rebuilt, the exhaust manifold gaskets replaced on both sides, and the choke warmer tube reattached to the manifold.
Runs great now, better than it was before it crapped out on Tuesday.
A big shout out to Rescino's Performance Engines in San Francisco for doing great work on the truck.
And thanks again to everyone who helped out in this forum!
Best,
John


(Sorry for cross posts.)

 

[TexasNomad]

Thats awesome! john I knew it had to be the carb.
My truck did the same thing when my Holly went south..
Glad you got every thing fixed.

 

[1985 Ford F-150]

Good to hear hope shes a runner now.