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04-17-2016, 07:44 AM | #1 |
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Join Date: Mar 2016
Location: Wilson NC
Posts: 113
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Hot soak? No, not in the tub :)
My father and I drove the '30 Tudor to town, about a 5 mile trip for gas. It sat for maybe 10 minutes at the most while I filled up. When starting back home, it cranked fine, started off in first fine, and then started sputtering and back firing through the carb when I shifted into second. I nursed it along, changed into third and it ran ok the rest of the way.
The points had closed up some, to about .015". I reset them and the timing. I took another 5 mile or so trip. It ran great. After stopping to chat with a neighbor for about 10 minutes, it did the same thing when I left. I was certain the point gap was correct, as well as the timing. When I returned, the gap was too wide. I reset it again, and took another test drive. It ran ok. I didn't have time to try it again after a short stop. Even if I didn't set the points correctly, I had the same symptoms. Anyone have any ideas? Thanks! |
04-17-2016, 07:49 AM | #2 |
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Join Date: May 2010
Location: Bucks County, PA
Posts: 11,454
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Re: Hot soak? No, not in the tub :)
Vapor lock
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04-17-2016, 07:56 AM | #3 |
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Join Date: May 2010
Location: Largo Florida
Posts: 7,225
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Re: Hot soak? No, not in the tub :)
Sounds like what Mitch says.
What was the OAT ? Is the horizontal portion of the fuel line actually running downhill to the carburetor ? |
04-17-2016, 09:16 AM | #4 |
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Join Date: May 2010
Location: on the Littlefield
Posts: 6,140
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Re: Hot soak? No, not in the tub :)
I have had condensers that act like that too---before I put in the A&L condenser---once I knew for over 100 miles that soon i was going to have to change it, every time I stopped at a yard sale it would sputter till the airflow cooled it, then I put in the newfangled A&L condenser, it's still in there 30 years later, same one, never any problems
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04-17-2016, 09:20 AM | #5 |
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Join Date: Jul 2010
Location: west coast Fla..
Posts: 311
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Re: Hot soak? No, not in the tub :)
When fueling shut off gas valve.
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04-17-2016, 09:24 AM | #6 |
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Re: Hot soak? No, not in the tub :)
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04-17-2016, 01:33 PM | #7 |
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Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
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Re: Hot soak? No, not in the tub :)
What Mitch said. My car did the same thing until I started using only the good gas.
For reliability you should install the heat proof condenser Kurt mentioned, if you don't already have one. |
04-17-2016, 02:52 PM | #8 |
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Join Date: May 2010
Location: Amana IA
Posts: 527
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Re: Hot soak? No, not in the tub :)
After the first incident, you found the points gap had closed up a little and re-adjusted them. Not uncommon, rub blocks do wear.
Then after the second incident, you found the points gap too wide. Was this because the points gap wasn't set correctly after the first incident? Or, do the bushings in the distributor have wear? I'm just writing out-loud here because my points would not stay set properly, and it was due to worn bushings. Just info.
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Ron/IA 1929 Fordor Steelback Hawk A Model A Ford Club http://hawkamodelaclub.org/ |
04-17-2016, 03:26 PM | #9 |
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Join Date: Apr 2011
Location: New Zealand
Posts: 444
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Re: Hot soak? No, not in the tub :)
Also, I had a new distributor fitted to my car and it took a while to discover that the distributor cam had either been machined off centre or machined wrongly.
It was hard to get it to run smoothly and I normally set the points at 20 thou on number 1 cylinder (Having checked the timing at the same time.) What I didn't realise was that if I'd checked the gap on the other 3 lobes at the same time I would have found the gaps to be 30-40thou. A new "super" cam transformed the car Keith |
04-18-2016, 06:49 AM | #10 |
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Join Date: Sep 2011
Posts: 7
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Re: Hot soak? No, not in the tub :)
Try changing the gas. Winter Vs summer gas has a different vapor pressure. Winter gas has a lower boiling point for starting in cold weather.
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04-18-2016, 07:31 AM | #11 |
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Join Date: May 2010
Location: Bucks Co, Pa
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Re: Hot soak? No, not in the tub :)
I haven't read anything about the point gap closing and opening. That would very suspicious to me. How are the distributor bearings? Or the cam and shaft itself ?
Terry |
04-18-2016, 07:38 AM | #12 |
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Join Date: May 2010
Location: Long Island, NY
Posts: 3,429
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Re: Hot soak? No, not in the tub :)
As an antique car owner / driver, to trouble-shoot occurrences when your Model A acts up you should have a routine. The routine needs to be based on the basics of motor operation:
>Fuel >Ignition >Compression >Cooling Also practice a routine for diagnosing running gear issues.
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04-18-2016, 08:27 AM | #13 |
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Join Date: May 2010
Location: South East NJ
Posts: 3,398
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Re: Hot soak? No, not in the tub :)
How much play is in the upper plate?
If you have a worn area on the dist and a worn upper plate it may move some. Try sliding the plate. Do you have lube on the cam? Is the cam smooth? |
04-18-2016, 09:31 AM | #14 |
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Join Date: Nov 2012
Location: Elgin Illinois
Posts: 735
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Re: Hot soak? No, not in the tub :)
Worn distributor bushings
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