351M carb Q
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I'll have the Roast Duck
Joined: Jul 2002
Posts: 9,622
Likes: 110
From: Northshore, MN
351M carb Q
I have a 78 f150 351M non-catalyst. I have a 78 bronco catalyst. Both have motorcraft carbs, but the bronco has a link rod going from the vac. adv. hose to the front of the carb. the f150 doesn't. what actuates the rod, and if it's faulty, what effect would it have on timing advance? The bronco starts, but hit the gas and it pops through the carb and dies. restarts just fine, only to do the same thing again. Looking for a quick fix, as it's only to get the bronco moved around the yard.
PS: the dist. itself is stuck retarded to aid in torque/plowing snow.
Plan on testing the ign. module, buying plugs, cap, rotor, this weekend.
PS: the dist. itself is stuck retarded to aid in torque/plowing snow.
Plan on testing the ign. module, buying plugs, cap, rotor, this weekend.
Last edited by havi; May 22, 2007 at 10:25 PM.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
The choke pull off has a vacuum connector at the front, at the rear it has a slotted arm where a rod attaches with an E clip.
Non California, right?
D8AZ-9S514-D .. Control, Vacuum Break [Choke Pull-off] (Motorcraft CK-2057)
Non California, right?
D8AZ-9S514-D .. Control, Vacuum Break [Choke Pull-off] (Motorcraft CK-2057)
Last edited by NumberDummy; May 23, 2007 at 09:17 AM.
Thread Starter
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I'll have the Roast Duck
Joined: Jul 2002
Posts: 9,622
Likes: 110
From: Northshore, MN
the first one is my 78 f150. the second one is the 78 bronco in question. But, I think I answered my own question when I noticed the vac adv. hose was mounted at the p side base of carb, lol. It ran a little better, and i was able to move it.
Postmaster
Joined: Jul 2001
Posts: 4,956
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From: MD
Jesus, don't tell me that is the original Motorcraft Duraspark spark plug wires in the '78 F150!!
Now I understand what you're trying to get.
The FRONT BOTTOM RIGHT vacuum port is the Electric vacuum port. I think it is supposed to go to the vacuum advance on most applications. On mine, it has to go through the PVS on the water neck then to the vacuum advance.
Now I understand what you're trying to get.
The FRONT BOTTOM RIGHT vacuum port is the Electric vacuum port. I think it is supposed to go to the vacuum advance on most applications. On mine, it has to go through the PVS on the water neck then to the vacuum advance.
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Posting Legend
Joined: Sep 2001
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Where did you find those trucks? At the bottom of lake Superior???
That bump on the top of the carb which is machined in one carb and not used on the other is part of the fuel bowl vent system. The hose on the lower picture goes to the vapor recovery system. The vent plug is actuated by the throttle lever. Move the throttle to see what it does.
The system has nothing to do with timing, just emissions.
That bump on the top of the carb which is machined in one carb and not used on the other is part of the fuel bowl vent system. The hose on the lower picture goes to the vapor recovery system. The vent plug is actuated by the throttle lever. Move the throttle to see what it does.
The system has nothing to do with timing, just emissions.
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Thread Starter
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I'll have the Roast Duck
Joined: Jul 2002
Posts: 9,622
Likes: 110
From: Northshore, MN
Where did you find those trucks? At the bottom of lake Superior???
My dad bought the f150 new, but the engine came from my uncle's 78 f150. which has something like 60,000 miles on it. Coincidence, perhaps, but moving the vac hose(other end to dist.) in the lower pic from above the carb to the pass. side port seemed to help. It was then I noticed the rod had nothing to do with it. PO's for ya, bought the bronco for the plow.
PS: and yes, those are the original plug wires, IIRC.
Last edited by havi; May 23, 2007 at 10:46 PM.
Posting Legend
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Elder User
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From: Cary/Rocky Mount NC
Originally Posted by havi
lol, you'd think so.
My dad bought the f150 new, but the engine came from my uncle's 78 f150. which has something like 60,000 miles on it. Coincidence, perhaps, but moving the vac hose(other end to dist.) in the lower pic from above the carb to the pass. side port seemed to help. It was then I noticed the rod had nothing to do with it. PO's for ya, bought the bronco for the plow.
PS: and yes, those are the original plug wires, IIRC.
My dad bought the f150 new, but the engine came from my uncle's 78 f150. which has something like 60,000 miles on it. Coincidence, perhaps, but moving the vac hose(other end to dist.) in the lower pic from above the carb to the pass. side port seemed to help. It was then I noticed the rod had nothing to do with it. PO's for ya, bought the bronco for the plow.
PS: and yes, those are the original plug wires, IIRC.
New User
Joined: Jun 2007
Posts: 8
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From: lexington , sc
first off wanna say hey to all...new guy here , been checking out site for couple weeks and this is my virgin post.....anyone know where to find vacuum diagram for 79 bronco ? it has 351m but was missing breather and none of the vacuum advance appears to be hooked up...having problems with carb and prefer to eliminate vacuum problem first. any help would be appreciated
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