hard start 1987 ford f700
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hard start 1987 ford f700
I have a 1987 ford f700 with a 370 in it. I never meet such a tempormental truck in my life. Somtimes it starts sometimes it doesn't. When it does start it runs smooth as silk with a little backfire. I do believe its over fueling at idle. I changed the coil the other day and the hole time it had the wrong coil on it. Still no spark out of the coil. I have 12v at the two wires that hook up the the coil as long as there not hooked up. As soon as I hook the two wires up to the coil the voltage drops below 6v. Is that proper. I also found a stripped brown and yellow striped wire with in the harness. It was laying on top of the valve cover on the passenger side. Does any body have any direction.
Senior User
Joined: Feb 2010
Posts: 290
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From: Seattle Washington
bare wires are always bad, clean up the harness, and clean the connections for the distributor, and the dura sparker. Does the coil say internal resistor? or external resistor?
I have a 1990 with a 429, and the coil says internal resistor. Im not sure if its the original or not, but it runs.. and starts easily. I assume its running at 6v. Never checked.
I have a 1990 with a 429, and the coil says internal resistor. Im not sure if its the original or not, but it runs.. and starts easily. I assume its running at 6v. Never checked.
Elder User
Joined: May 2004
Posts: 565
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From: saxton pa.
Ignition
I had a 81L700 with a 429 in it , same symptoms it turned out to to be the ignition switch and the harness plug -- had the spade connectors burnt black , thus making a bad connection and unreliable connection.
Have A Great Day------ Hotwrench
Have A Great Day------ Hotwrench
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
The three step scenario of a failing DuraSpark ignition module:
1) Module overheats, engine dies. Module cools down, engine restarts almost at once.
2) Module overheats, engine dies. Module cools down, engine restarts in an hour...or so.
3) Sooner or later, usually sooner, the module overheats, burns out. Now...the engine will not restart.
Since the puppy only fails when it overheats, removing it...then taking it to a parts store to be tested...means that usually it will test OK, unless the puppy has failed all together.
1) Module overheats, engine dies. Module cools down, engine restarts almost at once.
2) Module overheats, engine dies. Module cools down, engine restarts in an hour...or so.
3) Sooner or later, usually sooner, the module overheats, burns out. Now...the engine will not restart.
Since the puppy only fails when it overheats, removing it...then taking it to a parts store to be tested...means that usually it will test OK, unless the puppy has failed all together.
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since I have put the harness back in it seems to be starting up fine. I still have a little miss and backfire. sounds like a gunshot. I read that if you had a donut missing in the exhaust it would cause a backfire. I just dont think it would cause one that loud. I realized that there was some play in the rotor shaft in the distributar. What is to much play ?
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