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06-04-2019, 09:29 PM | #1 |
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Join Date: Jun 2019
Location: Illinois
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1930 Model A. Runs great for about 15 minutes
Hi. New to Model A's. Engine has new coil, points, recently added thermostat, no bubbles in water at any rpm, machined head, new gasket, & rebuilt carburetor. Will run fine, great power, after about 15 to 20 minutes it backfires once, sputters, loses power. Pulling choke keeps it going for a while, can be restarted then immediately dies each time. No adjustments help. Coolant never gets above 170. Ideas? Thank you all in advance.
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06-04-2019, 09:40 PM | #2 |
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Re: 1930 Model A. Runs great for about 15 minutes
If your gas cap is not venting properly you may be developing a vacuum in the gas tank after running for a few minutes.
Next time it dies try loosening the fuel cap and see if it restarts for another 15 minutes or so. The vents on the cap can be cleaned with spray brake cleaner, if you have the correct style vented cap. If not check the vendors for a replacement.
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06-05-2019, 12:23 PM | #3 |
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Re: 1930 Model A. Runs great for about 15 minutes
I'm thinking the same as 1955cj5. Next time you drive just loosen the cap before you start off.
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06-05-2019, 01:11 PM | #4 |
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Re: 1930 Model A. Runs great for about 15 minutes
Is vented. Had cap off many of the times it's done this and see filter is clean.
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06-05-2019, 01:25 PM | #5 |
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Re: 1930 Model A. Runs great for about 15 minutes
repro, gas cap? gas cap not venting
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06-05-2019, 05:20 PM | #6 |
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Re: 1930 Model A. Runs great for about 15 minutes
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06-05-2019, 06:55 PM | #7 |
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Re: 1930 Model A. Runs great for about 15 minutes
Pulling the choke keeps it going for awhile,sounds like a fuel problem,when it dies take the fuel line off the carb and check for fuel flow.If it is a viton tipped needle and seat could be sticking closed not allowing carb bowl to fill.
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06-07-2019, 10:46 AM | #8 |
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Re: 1930 Model A. Runs great for about 15 minutes
Fuel flow problem from tank! as a check, remove gas line as rocket1 suggest and using air pressure, blow back in line to tank, just to see if rust gets moved away from tank outlet, and see how long the car runs.
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01-01-2020, 12:53 PM | #9 |
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Location: Illinois
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Re: 1930 Model A. Runs great for about 15 minutes
Timing gear slipped a tooth. Put an aluminum cam gear on
It runs fine now. |
01-01-2020, 01:21 PM | #10 |
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Re: 1930 Model A. Runs great for about 15 minutes
A bad timing gear caused it to run for awhile then quit ? Thats interesting.
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01-01-2020, 01:46 PM | #11 |
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Re: 1930 Model A. Runs great for about 15 minutes
I install pencil filters in every A gas tank.
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01-01-2020, 01:55 PM | #12 |
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Re: 1930 Model A. Runs great for about 15 minutes
Maybe if it was running retarded it got hot enough to effect the coil or condenser.
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01-02-2020, 02:29 AM | #13 |
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Re: 1930 Model A. Runs great for about 15 minutes
Am with wmws. During the time it was giving fits, it seemed everything was rather hot under the hood and though I didn't have an IR temperature gun on me, the water seemed to have neared the boiling point. Figured out what had happened when checking everything. Once I got to the timing, the timing pin was seated well, but the #1 piston was not at TDC when looking through the plug hole. Off came the timing cover and the slightly chewed cam gear was there to say "found me."
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01-03-2020, 08:47 AM | #14 |
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Re: 1930 Model A. Runs great for about 15 minutes
condenser? i have seen them bad out of the box
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01-04-2020, 03:53 PM | #15 |
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Re: 1930 Model A. Runs great for about 15 minutes
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01-04-2020, 04:51 PM | #16 |
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Re: 1930 Model A. Runs great for about 15 minutes
Its a good practice when you have a fiber timing gear fail to drop the oil pan and clean the pickup screen.
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01-05-2020, 07:06 PM | #17 |
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Re: 1930 Model A. Runs great for about 15 minutes
I don’t see how a timing gear that’s jumped time can run strong and never get above 170°. ( post 1). Then in post 13, it’s “close to boiling” and hot under the hood. I think your original problem is still there, and the timing gear was a later, second problem. Time will tell.
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