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1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck
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Old Nov 16, 2021 | 08:32 AM
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Big Red

My first rebuild at 57 years old. I have hooked a hose to vacuum advance. I'm havering a little problem with getting the idle down to where it doesn't jerk into gear. I have my timing at 22* BTDC. I can reduce the timing but then the truck doesn't excelerate and bogs.

My first rebuild.
 

Last edited by Mrifle; Nov 16, 2021 at 08:35 AM. Reason: Forgot engine and year 1975 2wd 390fe
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Old Nov 16, 2021 | 08:56 AM
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Sounds like a vacuum leak or a carburation problem. at an idle try covering the carb with a rag and see if it speeds up or dies.

Id your vacuum advance hooked to ported or manifold ?
 
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Old Nov 16, 2021 | 09:08 AM
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Vacuum hose

I have my hose attached left side of carburator.
I will try covering the carb to see if it changes anything.
I would say I'm a YouTube mechanic. 🙄
 
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Old Nov 16, 2021 | 09:42 AM
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Need to put a vacuum gauge on it. If you don't have one they are inexpensive. Should not have to be at 22 BTDC. 10-14 is normal.
Still have point ignition? Is it a stock cam? Have you verified #1 piston is at TDC when pointer is at 0 degrees on balancer?
 
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Old Nov 16, 2021 | 10:13 AM
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Are you 100% you have the timing marks lined up correct during assembly.
I am not a engine builder but I tend to agree with mark8man that 22 degrees??
seems like something not lining up correctly
 
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Old Nov 16, 2021 | 10:51 PM
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Vacuum leak

Hello again.
I did the rag over the carburator and it died. I would assume I don't have a vacuum leak.
I'm bouncing back and forth from the electrical wiring nightmare to trying to get my timing to where it slows down the idle.
My project is a 1975 F250 with the 390fe.
 
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