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09-28-2020, 01:51 PM | #1 |
Junior Member
Join Date: Sep 2020
Posts: 2
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1939 ford flat head wont fore after a rain
Have a 1939 ford sedan with a 46 flathead v8, seems like after a rain it just wont fire. any ideas????
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09-28-2020, 02:31 PM | #2 |
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Join Date: Mar 2014
Location: Jacksonville FL
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Re: 1939 ford flat head wont fore after a rain
Since your complaint is "only" when it "rains", its not a compression issue. Now your down to spark or gas delivery issue. Have you checked at the point when this happens to see IF you're getting spark to the spark plugs??? Quickest and easiest test!! IF no spark then you have your problem area to search......... IF you have spark, then you have your problem area to search!!! Hard to answer without more information on what exactly is or is not happening and when it is or is not happening. IF it is a "spark" issue the initial point after it rains you "might" look at your distributor cap and see IF you have condensation building up from the humidity/rain.
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09-28-2020, 02:33 PM | #3 |
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Join Date: Sep 2020
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Re: 1939 ford flat head wont fore after a rain
no i havent checked plugs, just seems like after a rain it wont fire, today it fired up??
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09-28-2020, 02:34 PM | #4 |
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Join Date: May 2010
Location: Solihull, England.
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Re: 1939 ford flat head wont fore after a rain
Hello and welcome to the forum.
Just a guess but I'd be looking for some sort of water leak that may be dripping onto the ignition leads. |
09-28-2020, 02:40 PM | #5 | |
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Location: Jacksonville FL
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Re: 1939 ford flat head wont fore after a rain
Quote:
Does the car sit outside, or in a damp garage???? |
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09-28-2020, 04:36 PM | #6 |
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Re: 1939 ford flat head wont fore after a rain
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09-28-2020, 04:58 PM | #7 |
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Re: 1939 ford flat head wont fore after a rain
Even without rain getting under the hood, high humidity can condense on the spark plug wires. If they are old, the moisture can penetrate and spark will jump to ground in the wire loom instead of through the plug.
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09-28-2020, 05:24 PM | #8 |
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Re: 1939 ford flat head wont fore after a rain
What distributor/cap?
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09-28-2020, 05:37 PM | #9 |
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Location: Minnesota, Florida Keys
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Re: 1939 ford flat head wont fore after a rain
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09-28-2020, 06:08 PM | #10 |
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Join Date: Jul 2016
Location: Lake worth Florida
Posts: 1,101
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Re: 1939 ford flat head wont fore after a rain
Use a spray bottle mist and at night , spray the engine lightly . Have someone try starting the engine . Look for sparks , have it as dark as possible. If it starts continue checking for spark or the sound of arcing .
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09-28-2020, 06:59 PM | #11 |
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Location: Green Bay Wi
Posts: 400
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Re: 1939 ford flat head wont fore after a rain
with the engine running Spray the dist cap slowly and then move to the coil and wires my brother had a 50 ford when we were in high school (around 50 years ago )and as soon as the clouds got dark it would die then a old timer mechanic told us to try this and sure enough it needed a cap and rotor good luck
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