vacuum causing problems?????
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vacuum causing problems?????
Hey all,
Love my 1972 F-100, 302
I have my truck all back together now after a complete valve job, and it runs smooooth at idle. When I rev it up a bit, it start missing out and running rough (in Park). When I took off my vacuum lines to the Distrib to check my timing with my light, it purrs at all RPMS... Why is my vacuum advance causing this problem? I am sooo close to having my baby purrfect, this is making me a little nuts. Thanks Mike
Love my 1972 F-100, 302
I have my truck all back together now after a complete valve job, and it runs smooooth at idle. When I rev it up a bit, it start missing out and running rough (in Park). When I took off my vacuum lines to the Distrib to check my timing with my light, it purrs at all RPMS... Why is my vacuum advance causing this problem? I am sooo close to having my baby purrfect, this is making me a little nuts. Thanks Mike
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vacuum causing problems?????
Mike use the port on the other side of the carb. 
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vacuum causing problems?????
WEll guys,
I tried both suggestions,
The plate inside my distib seems to be moving ok, and it seems to be working properly, and my ground wires are all attached properly, but still no luck.
My 72 302, has 2 vacuum lines. I'm guessing 1 to pull, 1 to push...
the come from the carb choke side, and the other from the back of the intake manifold...where would I find another vacuum source that isn't occupied?
or any other suggestions?
I tried both suggestions,
The plate inside my distib seems to be moving ok, and it seems to be working properly, and my ground wires are all attached properly, but still no luck.
My 72 302, has 2 vacuum lines. I'm guessing 1 to pull, 1 to push...
the come from the carb choke side, and the other from the back of the intake manifold...where would I find another vacuum source that isn't occupied?
or any other suggestions?
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vacuum causing problems?????
What carb is on that?
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vacuum causing problems?????
well, I have a Motorcraft carb 2 bbl, but not sure exactly what model.
I checked my point gap, timing, and mixture/idle screws...all ok. The vacuum line that goes from my carb (near the auto choke) to the front of my distrib seems to be the problem.
when I pull it fro the distrib and plug it with my finger, it runs smooth. I am trying to find another port to try to get vacuum from...no luck..maybe I'm missing something?
I checked my point gap, timing, and mixture/idle screws...all ok. The vacuum line that goes from my carb (near the auto choke) to the front of my distrib seems to be the problem.
when I pull it fro the distrib and plug it with my finger, it runs smooth. I am trying to find another port to try to get vacuum from...no luck..maybe I'm missing something?
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vacuum causing problems?????
>well, I have a Motorcraft carb 2 bbl, but not sure exactly
>what model.
>I checked my point gap, timing, and mixture/idle
>screws...all ok. The vacuum line that goes from my carb
>(near the auto choke) to the front of my distrib seems to be
>the problem.
>when I pull it fro the distrib and plug it with my finger,
Do you mean : You pull the vacuum line and then plug IT or you plug the vacuum port on the carb?
The ported vacuum is on the right front of the carb below the choke housing.
Do you have a vacuum gauge ?
>it runs smooth. I am trying to find another port to try to
>get vacuum from...no luck..maybe I'm missing something?
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>what model.
>I checked my point gap, timing, and mixture/idle
>screws...all ok. The vacuum line that goes from my carb
>(near the auto choke) to the front of my distrib seems to be
>the problem.
>when I pull it fro the distrib and plug it with my finger,
Do you mean : You pull the vacuum line and then plug IT or you plug the vacuum port on the carb?
The ported vacuum is on the right front of the carb below the choke housing.
Do you have a vacuum gauge ?
>it runs smooth. I am trying to find another port to try to
>get vacuum from...no luck..maybe I'm missing something?
[font color=red]Dennis
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vacuum causing problems?????
Pull the vacuum line off the vacuum port on the carb and replace it with the vacuum gauge hose.
At idle, there shouldn't be any vacuum >
Now, Rev it up and vacuum SHOULD appear < Thus being a ported vacuum line.
Have you tested the vacuum advance mechanism ?
get a vacuum gun ,place the hose on the vacuum advance port and watch to see if the arm on the advance pulls on the mechanism.
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At idle, there shouldn't be any vacuum >
Now, Rev it up and vacuum SHOULD appear < Thus being a ported vacuum line.
Have you tested the vacuum advance mechanism ?
get a vacuum gun ,place the hose on the vacuum advance port and watch to see if the arm on the advance pulls on the mechanism.
[font color=red]Dennis
FTE Adminstration
[/font]
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64 1/2 Mustang Pre-World's Fair Car #8092
68-Mustang 289 2v-Sunlit Gold
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Thread Starter
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Freshman User
Joined: Oct 2001
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vacuum causing problems?????
I have to go out of town for awhile, so it seems my old truck willhave to sit unfinshed for a couple of weeks.
as a quick fix, I just pulled the carb vacuum line off of the distrib and shoved a golf tee in there to seal it. (like when you are using a timing light) but the other line I left atached to the distrib. I ran it about 40 miles today, and other than a slight hesitation taking off from stop signs (after it gets warm) it runs fine. I wonder if this isnt a choke problem? since that is where this vacuum line comes from..
as a quick fix, I just pulled the carb vacuum line off of the distrib and shoved a golf tee in there to seal it. (like when you are using a timing light) but the other line I left atached to the distrib. I ran it about 40 miles today, and other than a slight hesitation taking off from stop signs (after it gets warm) it runs fine. I wonder if this isnt a choke problem? since that is where this vacuum line comes from..
