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I have a 1979 F800 with the 370-V4. it has the governor on the carb. Now I can't get it to rev up. will start and idle.
the only thing I have done is a few years ago I installed a mechanical oil pressure gauge and last week I seen that the old sending unit was leaking on the back side of the motor. so I removed it. anyone know if that stupid thing has anything to do with the Governor?
1978-79 with that engine has the "electronic" governor, so the links provided above won't help. I have zero experience with that generation of governor.
I have only generic advice: on Ref. 9507 check that the vacuum line is connected to the hose barb, and that the electrical connector is still plugged in. Based on what I see of the 9B570 image, you can pull the steel side cover 9981 off and verify that there isn't a mechanical issue.
If it works similar to the older pneumatic setup, the spring 9980 pulls on the throttle shaft and wants to open it. It pulls pretty hard -- it does not have a lot of leverage, and it's only about 1.25" long. With the engine OFF and the accel pedal depressed, the throttle shaft should rotate to open, via that spring. If it doesn't, make certain that there is not a mechanical issue, like a corroded throttle shaft. It should move very freely, because it's a small spring with little leverage. Don't try to replace the spring with a stiffer one, fix the mechanical issue.
Also, if that spring is disconnected, the throttle will not want to open. It will, a little, but only via engine vacuum acting on the throttle plate, which isn't much as it's fairly balanced.
On the older system, the diaphragm pulls against the spring to close the throttle, regardless of what you do with the accelerator. Put another way, the accelerator pedal isn't connected to the throttle plate at all, it (the accel linkage return spring, actually) merely acts against that little spring 9980. Lack of vacuum means it will not govern, so I would not expect a hose disconnected to give a "won't rev" symptom. But I honestly don't know how this system work, and what the electronic part does. There is an electronic box that it interfaces with, but the whole thing is crude by today's standards and it doesn't do a whole lot, it's not a computer, IIRC it's analog.
Perhaps someone with experience with this later electronic governor will add more info. I don't have the Ford Shop Manual for '78-79, so I can't add more, but if you're going to work on your own truck, having the manual is a good investment. Reverse-engineering stuff of that era isn't easy; documentation helps a lot.
find a gasket or rebuild kit for the carb .remove every part and soak it in a good solvent .clean out the needle and seat ,or replace them .spray every passage then blow them out .the back metering plate can retain alot of debris.also check the throttle shafts for and slop ,that can cause a vacuum leak . if you can't find a rebuild kit for less then a used vacuum secondary carb on Face Book.and check your distributor ,make sure the vacuum and mechanical advances are working .test plugs and plug wires .check cap and rotor .change the fuel filter .how much fuel pressure do you have
if it is like my 78 F-600 389 4v there is a spring that pulls the primary butterflies to WOT , the double external spring on the throttle linkage overpowers it & takes it to idle position. your foot of course overpowers the double springs which allows the single internal spring to open butterflies
clear as blue mud ?
Yeah, what buzz said (in many less words than I did above).
If there's a mechanical issue with the primary throttle shaft -- if it's hard to move, for example -- then the little spring (ref 5580) can't pull the throttle open, and nothing you do with the accel pedal will fix that.
Tore into it yesterday. everything looked fine nothing binding or corroded. but the solenoid Ref#9507,I could not get it to energize.(no shorts to ground or anything), so reinstalled it. and now it will rev up and runs. but it is unplugged. need to take it out and drive it. don't know if the secondarys are opening or not. Man Thank You so much for your help. I was stumped.
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