Engine starts but quits
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More Turbo
Joined: Apr 2004
Posts: 736
Likes: 3
From: South East, Michigan
Engine starts but quits
A friend of mine has a 1978 F-150 extended cab with a 351 in it. He said it starts when ignition is in "crank" position but quits when ignition switch is returned to "run" pisition. Any ideas what may be the culprit? Thanks -Ed
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Joined: Nov 2003
Posts: 747
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My 79 460 was the other way.Soon as you turn the key back to run it would bump.All testing with ohm meter tested good.Volts to spec at white and red wire at module and at coil, 12 volts on start to coil and in run back to 6-7 volts.Replaced with spare module and bam, start right up as soon as you turn to start.
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Joined: Nov 2003
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Laughing Gas
Joined: Jun 2016
Posts: 855
Likes: 56
From: Des Moines, Washington
With points, that's a sure sign your ballast resistor or wire is bad. It should be the same diagnosis with the Dura-Spark electronic ignitions.
Follow 460me's link, at "BATTERY SOURCE TEST", you are testing for voltage at the "bat" terminal on the coil. A open resistance will leave you with no voltage at the coil. Key in start position bypasses the resistance to give full voltage when starting.
Follow 460me's link, at "BATTERY SOURCE TEST", you are testing for voltage at the "bat" terminal on the coil. A open resistance will leave you with no voltage at the coil. Key in start position bypasses the resistance to give full voltage when starting.
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Joined: Jun 2015
Posts: 534
Likes: 27
From: North Texas
I had something similar happen on a previous '78 of mine, turned out to be the ignition switch. If he backs off the Crank position just enough to disengage the starter but not all the way back to the Run position does it keep running?
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