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12-19-2020, 10:45 PM | #1 |
Senior Member
Join Date: Jul 2010
Location: Palm City FL>
Posts: 556
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46 ford misfire
My 46 ford flathead v8 has a faint misfire at 40 to 50 miles an hour obviously this is at a very low throttle setting. The misfire goes away if I pull the choke out about one third. My motor is quite sound, has a Bubba's distributor, a Charlie NY carburetor and fuel pump, fresh plugs and wires, I even had Charlie down here in Florida go thru my carb He said " I hate going thru a carburetor like this" I asked why? he said" I couldn't find anything wrong with it" I am sure I don't 'have a vacuum leak as it idles like a kitten. I even have an electric fuel pump in line, makes no difference whether it is on or off still sounds like the motor is running too lean at cruise speed. I would run with the partial choke setting but when I stop for a light or something I have to push the choke in or it idles at a couple thousand or so! I am out of ideas, any help from you guys will be greatly appreciated, Thanks Rich by the way the motor is completely stock
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12-19-2020, 11:52 PM | #2 |
Senior Member
Join Date: May 2010
Posts: 362
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Re: 46 ford misfire
It sounds like you have a restricted fuel line or a vacuum leak on the input to the fuel pump. Try replacing the flex line to the fuel pump. Use a correct flex line, not a rubber hose with clamps. Your electric fuel pump could be restricting fuel flow also.
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12-20-2020, 12:00 AM | #3 |
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Join Date: Sep 2020
Location: San Angelo Texas
Posts: 56
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Re: 46 ford misfire
I’d replace the condenser 1st. Cheap and easy. Sounds like a similar situation I had some years ago.
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12-20-2020, 07:45 AM | #4 |
Senior Member
Join Date: Jul 2010
Location: Palm City FL>
Posts: 556
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Re: 46 ford misfire
Norris, just did that a few weeks , thanks
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12-20-2020, 08:24 AM | #5 |
Senior Member
Join Date: May 2010
Location: Florida and Penna.
Posts: 4,471
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Re: 46 ford misfire
Try some Marvel Mystery oil. Down the carb and
in the tank. Sticky valves. G.M.
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12-20-2020, 08:55 AM | #6 |
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Location: Palm City FL>
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Re: 46 ford misfire
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12-20-2020, 03:07 PM | #7 |
Senior Member
Join Date: Jan 2014
Location: Orcas Island Washington
Posts: 5,133
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Re: 46 ford misfire
Had a very similar situation a couple months ago. Chased it for months. Mine went like this... It finaly broke down 5 miles from home. Got towed. the rotor had shorted to ground. Replaced it, but it still had the miss. The miss continued to worsen. I found one cylinder wasn't firing, and sometimes two. I discovered my plug wires that I had taken off a scrap motor years before were of the carbon type. Not real wire. I run 12 v and a bosch super coil. I bought a set of universal copper wires and made them up. My woodie has never run as well as it does today. Of course during the investigation I had tuned, adjusted and tweaked every system in the process, but in my case the problem was the bad wires.
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1946 Tonner Pickup with 226 H six, 1979 Toyota landcruiser wagon, now wearing 1947 Ford Jailbar sheet metal. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
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