The Ford Barn

rivcokid · 09-29-2019, 03:07 PM

Hi all - my 31 Deluxe Roadster has developed a bucking problem. In 2nd and 3rd gears, if I slow down past a certain point and then try to speed up again (like if I slow down for a red light that turns green before I can stop, but I slow down quite a bit), the car bucks, especially in 3rd gear. It's become pretty violent and I need to pull over, completely stop, and then start all over again. The engine runs fine, except that it is hard to start, but it always does start. The transmission can be tempermental to shift sometimes too. The bucking never occurs when going through the gears 1, 2, 3 as normal, just when the speed decreases in 2nd or 3rd gear. Any ideas? Thanks as always in advance.

Purdy Swoft · 09-29-2019, 03:48 PM

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The initial timing could be a bit on the advanced side . The other common possibility could be improper use of the spark lever . Driving with full advance at SPEED is just fine . At lower speeds in the higher gears you need to retard the spark a bit to remove bucking . It is very easy to lug the engine and damage babbit when driving at too low of speed in the higher gears with too much advance .

09-29-2019, 03:07 PM	#1
rivcokid Senior Member Join Date: Sep 2018 Location: Riverside, CA Posts: 173	Car bucks violently at lower speeds Hi all - my 31 Deluxe Roadster has developed a bucking problem. In 2nd and 3rd gears, if I slow down past a certain point and then try to speed up again (like if I slow down for a red light that turns green before I can stop, but I slow down quite a bit), the car bucks, especially in 3rd gear. It's become pretty violent and I need to pull over, completely stop, and then start all over again. The engine runs fine, except that it is hard to start, but it always does start. The transmission can be tempermental to shift sometimes too. The bucking never occurs when going through the gears 1, 2, 3 as normal, just when the speed decreases in 2nd or 3rd gear. Any ideas? Thanks as always in advance.

09-29-2019, 03:48 PM	#2
Purdy Swoft Senior Member Join Date: May 2010 Location: Alabama Posts: 8,099	Re: Car bucks violently at lower speeds Sponsored Links (Register now to hide all advertisements) The initial timing could be a bit on the advanced side . The other common possibility could be improper use of the spark lever . Driving with full advance at SPEED is just fine . At lower speeds in the higher gears you need to retard the spark a bit to remove bucking . It is very easy to lug the engine and damage babbit when driving at too low of speed in the higher gears with too much advance .