The Ford Barn

sandbug · 06-05-2025, 08:36 PM

A new issue arose. On slight acceleration or slow cruising, the car lurches forward as it's getting a lot of gas, and then it jumps back down (over and over).

I was in a transmission seminar, and took of the tower afterwards to see how my gears are. If I didn't align right when I put back on the tower, could the transmission do this?

Other ideas?

1930 Ford Model A Deluxe Roadster. 1932 B engine, Weber Carburetor (new fuel pump), high compression head, FSI ignition, 12 volts, headers and smitty exhaust.

https://youtu.be/CSwvffB0u1Y?feature=shared

Thanks,

Eric

Kurt in NJ · 06-05-2025, 09:19 PM

If the transmission shifts the gears normally it can be assumed the tower was reinstalled correctly.
If you have a stock distributor put that back in and see if the problem changes.

Chuck Sea/Tac · 06-05-2025, 09:31 PM

I’m betting it’s in the Webber carb.

nkaminar · 06-06-2025, 05:04 AM

It is not the transmission. Try a stock distributor first.

Also try jetting the carburetor. I had to experiment with different jets to get my Weber to work well. I ended up with larger main jets in both barrels.

But I am going to bet it is in the distributor.

Benson · 06-06-2025, 07:36 AM

This car

Big hammer · 06-06-2025, 07:58 AM

Sponsored Links (Register now to hide all advertisements)

I once tried driving my A without a foot rest, the one next to the accelerator pedal, and it bucked like a wild horse being ridden for the first time.

History · 06-06-2025, 08:58 AM

Quote:

Originally Posted by Big hammer

I once tried driving my A without a foot rest, the one next to the accelerator pedal, and it bucked like a wild horse being ridden for the first time.

Imagine what it was like on the roads of the time of the model A , rodeo!

Richard Knight · 06-06-2025, 09:05 AM

Your problem is ignition and or carburetion. If you continue to drive it like that you may end up with transmission troubles. Those may be bolt on mods but to expect the engine to run properly without some tuning by an experienced mechanic would be a miracle.

sandbug · 06-06-2025, 07:57 PM

The carburetor has leaked, and stained pieces around it. After I took the filter off, I can see lots of dirt and dust. I took the carb off, and I'm going to rebuild it and clean it up. Thanks and I think this is the issue.

06-05-2025, 08:36 PM	#1
sandbug Junior Member Join Date: Apr 2011 Location: Glendale, California Posts: 16	Model A Issue - Odd Acceleration or Gear Climb? A new issue arose. On slight acceleration or slow cruising, the car lurches forward as it's getting a lot of gas, and then it jumps back down (over and over). I was in a transmission seminar, and took of the tower afterwards to see how my gears are. If I didn't align right when I put back on the tower, could the transmission do this? Other ideas? 1930 Ford Model A Deluxe Roadster. 1932 B engine, Weber Carburetor (new fuel pump), high compression head, FSI ignition, 12 volts, headers and smitty exhaust. https://youtu.be/CSwvffB0u1Y?feature=shared Thanks, Eric

06-05-2025, 09:19 PM	#2
Kurt in NJ Senior Member Join Date: May 2010 Location: on the Littlefield Posts: 6,555	Re: Model A Issue - Odd Acceleration or Gear Climb? If the transmission shifts the gears normally it can be assumed the tower was reinstalled correctly. If you have a stock distributor put that back in and see if the problem changes.

06-05-2025, 09:31 PM	#3
Chuck Sea/Tac Senior Member Join Date: May 2010 Location: Between Seattle & Tacoma Posts: 2,411	Re: Model A Issue - Odd Acceleration or Gear Climb? I’m betting it’s in the Webber carb.

06-06-2025, 05:04 AM	#4
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 5,859	Re: Model A Issue - Odd Acceleration or Gear Climb? It is not the transmission. Try a stock distributor first. Also try jetting the carburetor. I had to experiment with different jets to get my Weber to work well. I ended up with larger main jets in both barrels. But I am going to bet it is in the distributor. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

06-06-2025, 07:36 AM	#5
Benson Senior Member Join Date: May 2010 Location: Cen~Col - Central Highlands Posts: 2,757	Re: Model A Issue - Odd Acceleration or Gear Climb? This car Last edited by Benson; 06-10-2025 at 08:01 AM.

06-06-2025, 07:58 AM	#6
Big hammer Senior Member Join Date: Jun 2014 Location: Land of Lincoln Posts: 3,430	Re: Model A Issue - Odd Acceleration or Gear Climb? Sponsored Links (Register now to hide all advertisements) I once tried driving my A without a foot rest, the one next to the accelerator pedal, and it bucked like a wild horse being ridden for the first time. __________________ Don't force it with a little hammer tap, tap, tap get a bigger hammer tap done

06-06-2025, 09:05 AM	#8
Richard Knight Senior Member Join Date: Mar 2021 Posts: 243	Re: Model A Issue - Odd Acceleration or Gear Climb? Your problem is ignition and or carburetion. If you continue to drive it like that you may end up with transmission troubles. Those may be bolt on mods but to expect the engine to run properly without some tuning by an experienced mechanic would be a miracle.

06-06-2025, 07:57 PM	#9
sandbug Junior Member Join Date: Apr 2011 Location: Glendale, California Posts: 16	Re: Model A Issue - Odd Acceleration or Gear Climb? The carburetor has leaked, and stained pieces around it. After I took the filter off, I can see lots of dirt and dust. I took the carb off, and I'm going to rebuild it and clean it up. Thanks and I think this is the issue.