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EFV-8 Club Forum / General Ford Discussion / 47 Ford high rpm miss

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Discussion Topic: 47 Ford high rpm miss -- page: 1 2 3 4

TomO

02-23-2017 @ 9:17 AM

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I am glad that you are back on 6 volts and that the new coil got you running.

Before you run the engine any more, you should check to see if the voltage regulator was adjusted to supply more than 7.4 volts. If it was, you will have to have it reset to original specs by a generator repair shop or replace it. I prefer the reset as your regulator is probably better than the new ones available.

To check, connect your voltmeter to the BAT terminal of the regulator, start the engine and slowly raise the rpm until the voltage reading stabilizes. It should read 7.2 -7.4 volts. If it does not read in that range, have it adjusted.

You may experience light bulbs burning out because of their exposure to more than the rated voltage, so check them out every time you are going to drive your car.

Tom

supereal

02-25-2017 @ 1:50 PM

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If it is a stock coil, it will need the resistor. If it is a round coil, it usually has a built in resistor. Using an 8 volt battery usually will mean problems unless you have the coil rebuilt. If your problem reoccurs, find a shop with a distributor machine. Our Sun machine strobes the distributor so we can check for point bounce. Many of the point sets sold today have weak springs and no brass in the pivot hole. Good point sets will cost about $30. Anything less means they are overseas parts. Condensers are also suspect. If the vehicle was running well before you installed the points, you should consider using the old condenser. A weak condenser will cause the problems you mention.

Sgstepp@yahoo.com

02-27-2017 @ 3:22 PM

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Hello TomO, I did the voltage test as you described and received a steady voltage reading of 7.0 volts. Should this be adjusted up to a mininum of 7.2 as you described in your last reply? If so, is this an adjustment that I can make or should I have an electrical tech tackle this job. Thanks also for explaining how to check the voltage output on the bat terminal of the regulator.

sarahcecelia

02-28-2017 @ 4:53 PM

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An engine miss is most always cause by the ignition. The hight tension leads could be breaking down, Point flutter( caused by improper tension on them) I suggest running the motor in the dark and watching for spark jumping to ground.

TomO

02-28-2017 @ 7:49 PM

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You will probably be OK at 7.0 volts. If your battery doesn't charge fully, have the regulator adjusted. You should take it to a generator repair facility to have it adjusted.

The reading could be low due to voltage regulator temperature or circuitry in your voltmeter.

Tom

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