The Ford Barn

Reds · 07-04-2010, 07:15 AM

I have a 41 ford pickup, v8, converted to 12v. I have a problem with it bucking and missing. It always idles nice and smooth. But occasionally (every couple days) it will start bucking while I am accelerating. This goes on for a little while, then goes away. It's not overheating. When the problem started it acted like it was running out of gas - gulping air and sounding like it was running out of gas. So I checked the (electric) fuel pump and it pumps plenty of gas (fuel pressure set at 2lb). replaced rubber lines with fuel inj. hose. Then I got frustrated and bought a rebuilt carb. Still doing it. Then I pulled the Mallory dual point dist off, limited the total advance to 18 degrees, made sure the points were good, and changed the condensor and the coil (internal resistor coil). Also put on all new plug wires + new plugs. Still doing it. Then I sprayed the manifold and carb base with either to see if I had a vac leak - no. Then I timed it using a vac guage (adjusted to max vac then backed off 1 degree. final vac at 19). At this point it stopped acting like it was running out of gas and just started bucking when revved up. Any suggestions as to what to look for?

07-04-2010, 07:15 AM	#1
Reds Junior Member Join Date: Jun 2010 Location: Northeast Pennsylvania Posts: 19	Erratic problem I have a 41 ford pickup, v8, converted to 12v. I have a problem with it bucking and missing. It always idles nice and smooth. But occasionally (every couple days) it will start bucking while I am accelerating. This goes on for a little while, then goes away. It's not overheating. When the problem started it acted like it was running out of gas - gulping air and sounding like it was running out of gas. So I checked the (electric) fuel pump and it pumps plenty of gas (fuel pressure set at 2lb). replaced rubber lines with fuel inj. hose. Then I got frustrated and bought a rebuilt carb. Still doing it. Then I pulled the Mallory dual point dist off, limited the total advance to 18 degrees, made sure the points were good, and changed the condensor and the coil (internal resistor coil). Also put on all new plug wires + new plugs. Still doing it. Then I sprayed the manifold and carb base with either to see if I had a vac leak - no. Then I timed it using a vac guage (adjusted to max vac then backed off 1 degree. final vac at 19). At this point it stopped acting like it was running out of gas and just started bucking when revved up. Any suggestions as to what to look for?