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Old 09-27-2015, 10:21 AM   #1
carolinamudwalker
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Default Wont run at slow speed

Help Car ran flawlessly during a 1500 mile tour to the great smoky mountains. But coming home it would not run at low RPM's in traffic or stop lights. If I poured water over the carb I could get it to started again and would run ok as long as I did not slow down. outside temp 90 deg and car was running hotter than normal about 180 deg. What's the fix other than a down draft carb? ps:This continued until I pulled into the driveway at 10 pm. thax in advance Bob
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Old 09-27-2015, 10:32 AM   #2
Patrick L.
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Default Re: Wont run at slow speed

Are the engine side pans installed ? They should be.

I've made a heat deflector that starts at the manifold bolt above the carburetor and follows the exhaust manifold bend and ends being bolted to the flange.

I think it also helps to have the fuel line always going downhill.

Some say non ethanal helps.

This is if everything else is normal and you think the problem is heat related.
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Old 09-27-2015, 03:23 PM   #3
Kurt in NJ
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Default Re: Wont run at slow speed

look at the idle jet, secondary well ---once I had no idle and found a small crack in the tube that is part of the idle jet ----another time had some problems with dirt in secondary well
always check the points, it is surprising how some ignition problems can seem like carb problems
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Old 09-28-2015, 08:38 AM   #4
carolinamudwalker
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Default Re: Wont run at slow speed

Thanks guy's Side pans in place, I do think it is heat or carburetor related. I will go through the Carb and electrical systems just to be sure. I am just afraid that it is the nature of the beast.
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Old 09-28-2015, 08:48 AM   #5
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Default Re: Wont run at slow speed

Quote:
Originally Posted by carolinamudwalker View Post
Thanks guy's Side pans in place, I do think it is heat or carburetor related. I will go through the Carb and electrical systems just to be sure. I am just afraid that it is the nature of the beast.
Its not the nature of the beast, something is wrong and it can be fixed. Keep looking, you will find it, and Good Luck!
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Old 09-28-2015, 09:26 AM   #6
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Default Re: Wont run at slow speed

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Anyone have a picture of these "side pans"
I see nothing at the vendor sites for these.
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Old 09-28-2015, 09:55 AM   #7
DJ S
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Default Re: Wont run at slow speed

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Anyone have a picture of these "side pans"
I see nothing at the vendor sites for these.
http://www.snydersantiqueauto.com/engine-pans
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Old 09-28-2015, 12:27 PM   #8
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Default Re: Wont run at slow speed

Thanks DJS
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Old 09-28-2015, 12:39 PM   #9
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Default Re: Wont run at slow speed

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Originally Posted by burner31 View Post
Anyone have a picture of these "side pans"
I see nothing at the vendor sites for these.
Like this?
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File Type: jpg Engine Pan.jpg (52.4 KB, 8 views)
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Old 09-28-2015, 03:08 PM   #10
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Default Re: Wont run at slow speed

Check Ebay...available there for a reasonable price...but I have no idea of quality.
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Old 09-28-2015, 04:24 PM   #11
Jeff/Illinois
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Default Re: Wont run at slow speed

Quote:
Originally Posted by Kurt in NJ View Post
look at the idle jet, secondary well ---once I had no idle and found a small crack in the tube that is part of the idle jet ----another time had some problems with dirt in secondary well
always check the points, it is surprising how some ignition problems can seem like carb problems
I'd start there too. 80% of problems like these you are having is point related, and you just came off a 1500 mile tour---- time to reset the points especially if they were new and the rubbing block is now worn a tad. I'd do that first and then check/clean the carb.

Are you running a Zenith? Have you flow tested the jets, or gotten a GOOD pair already flow tested from Renner's? I had this once on the '29 Tudor. Points checked out fine but some crud had gotten into the secondary well. Cleaned it up, cleaned out the little holes in the bottom and it was off to the races!! Hope the secondary well fixture comes out OK they can be a bear if it's been a while.
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Old 09-28-2015, 10:19 PM   #12
Jerry in Shasta
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Default Re: Wont run at slow speed

Sounds like vacuum leak to me, or the carburetor halves have opened up.
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Old 09-29-2015, 05:40 PM   #13
KGBnut
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Default Re: Wont run at slow speed

I'm with Kurt. I had a similar problem driving to a car show in Southbury, Connecticut a few weeks ago. It was fine at speed, but wouldn't idle and stalled at every stop sign. Once we were parked on the field and had cooled down, we decided to tackle it. My fifteen-year-old daughter started by pulling the carb out...not a big deal. However, in just a few minutes, a small crowd gathered and started snapping pictures of her. It was like they had never seen a teenage girl twisting a wrench before.

Sure enough, there was visible grit blocking the idle jet. I blew it clear, reassembled it, and have had no troubles since.
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Old 09-29-2015, 06:04 PM   #14
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Default Re: Wont run at slow speed

KGBnut, you tell your daughter that she has given me renewed faith in the young folks of today. Thanks for the picture, you should be very proud.

Mudwalker, I would love to have been on that trip. Talk more about it, you've got to have some great stories.
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