carburetor problems
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Freshman User
Joined: Sep 2009
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carburetor problems
Hello I have a 1979 F250 with the 300 six. I installed a rebuilt 1barrell carb a few weeks ago. Since then I have been having a problem with the truck not running right. It seems to jerk allot expesically when the motors cold. To see if it was the carburetor I put the old one back on and the problem seemed to stop.
My question is since this is the first time ive ever repalaced a carb. Is this a problem with the new carb or do I just not have it adjusted right?
Thanks for any help
My question is since this is the first time ive ever repalaced a carb. Is this a problem with the new carb or do I just not have it adjusted right?
Thanks for any help
Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
Check the throttle shaft in the rebuilt carb for slop. It's a commonly overlooked/ignored item with commercial rebuilds as it requires drilling and installing a bushing along with a new throttle shaft.
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Freshman User
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I replaced the carb because it was in bad shape and the choke was broken. As it ends up I took it for another drive and the jerking/bucking is still there but not as noticible. I will drive it cold in the morning and then I will be able to tell for sure. It may not be in the carb but im really not sure what it could be. It has new spark plugs and I checked the wires and had the tranny checked.
Senior User
Joined: May 2010
Posts: 350
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From: Spartanburg, SC
Well if you swapped the carb back to the old one and the issues went away, you have a carb problem. Are the carbs identical or by different manufacturers? Do you have all of your vacuum lines connected correctly? Are there any open ports?
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Freshman User
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The problem is much less noticible but it may still be there with the old carb back on. They are both carter carbs, the new one was rebuilt by holley. I believe the vacuum lines are connected correctly and all open ports are plugged.
