The Ford Barn

30-9 · 10-05-2019, 07:38 PM

Hi Gents

Took 39 out today. All stock. Highway no problem. Slow or low rpms car is not running smooth. Runs rough at idle. Moving slow it jerks unless I rpms are up.

Bubba Helmet distro built to 11A maybe 8k on it.

Where should I start to correct?

drolston · 10-05-2019, 10:04 PM

Maybe float set too high, or debris in the float valve, or fuel pump pressure too high, causing minor flooding at low power. If you smell gasoline when things are getting jerky, that is a dead giveaway. Also look for wet gas around the top of carb.

Brian · 10-05-2019, 11:11 PM

Blocked idle tube in carb

cadillac512 · 10-06-2019, 06:38 AM

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Quote:

Originally Posted by Brian

Blocked idle tube in carb

I agree with Brian-sounds like an idle circuit isn't delivering fuel properly. In addition,worth checking for a vacuum leak.

Terry

10-05-2019, 07:38 PM	#1
30-9 Senior Member Join Date: Aug 2014 Location: MA Posts: 888	Low end Hi Gents Took 39 out today. All stock. Highway no problem. Slow or low rpms car is not running smooth. Runs rough at idle. Moving slow it jerks unless I rpms are up. Bubba Helmet distro built to 11A maybe 8k on it. Where should I start to correct? __________________ Thanks - 30-9 1939, 1940

10-05-2019, 10:04 PM	#2
drolston Senior Member Join Date: Jun 2014 Location: Williamsburg, VA Posts: 1,627	Re: Low end Maybe float set too high, or debris in the float valve, or fuel pump pressure too high, causing minor flooding at low power. If you smell gasoline when things are getting jerky, that is a dead giveaway. Also look for wet gas around the top of carb.

10-05-2019, 11:11 PM	#3
Brian Senior Member Join Date: May 2010 Location: Masterton, New Zealand Posts: 3,829	Re: Low end Blocked idle tube in carb __________________ Unfortunately, two half wits don't make a whole wit!