Vacuum Advance Stuck
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Mountain Pass
Joined: Mar 2016
Posts: 106
Likes: 1
From: Arizona
Vacuum Advance Stuck
My 77 F-150 with 460 has been hard starting when cold lately. I've think I have found the culprit. When I vacuum tested the Vacuum Advance diaphragm it held vacuum but the advance lever failed to move.
Is there a way to free it up without breaking anything?
Is there a way to free it up without breaking anything?
Senior User
Joined: Dec 2018
Posts: 152
Likes: 3
From: NEPA
That shouldn't effect starting at all just open throttle driving. Couple months ago I tried to get mine free because truck would knock bad going up hills on the highway. Couldn't get the vac advance free and couldn't get apart it was so rusted so got a reman dizzy from napa and 3 miles after installing the counter weights blew apart and sheared the shaft. Got another only this time new and so far so good. Got a Davis Unified on order just in case though.
Senior User
Joined: Dec 2018
Posts: 152
Likes: 3
From: NEPA
No just base timing controls starting. Vacuum advance advances the timing while you're at part throttle for gas mileage/driveability.
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Mountain Pass
Joined: Mar 2016
Posts: 106
Likes: 1
From: Arizona
It has Duraspark2 with a manual choke on an Edelbrock 1406.
Good spark, voltage and new ICM.
It starts great after a warm up.
Good spark, voltage and new ICM.
It starts great after a warm up.
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Lead Driver
Joined: Oct 2018
Posts: 7,877
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Check and see if your choke is closing properly. cables get out of whack too.
horribly low compression can cause poor starting.
If you have good spark then fuel is about the only other place to look.
horribly low compression can cause poor starting.
If you have good spark then fuel is about the only other place to look.
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Mountain Pass
Joined: Mar 2016
Posts: 106
Likes: 1
From: Arizona
I got the vacuum advance to free up with penetrating oil and tapping it gently.
You were right Butcher, it did not effect the cold starting.
I checked the carb and the two squirter nozzles were just dribbling fuel (not squirting).
I cleaned them and had to order new non-stick gaskets. Somehow the one I had stuck.
Anyway, waiting on them and a new steel accelerator pump. I'm pretty confident that was the hard start issue.
Thanks to all of you for your advice.
You were right Butcher, it did not effect the cold starting.
I checked the carb and the two squirter nozzles were just dribbling fuel (not squirting).
I cleaned them and had to order new non-stick gaskets. Somehow the one I had stuck.
Anyway, waiting on them and a new steel accelerator pump. I'm pretty confident that was the hard start issue.
Thanks to all of you for your advice.
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