99 explore sport 4.0 L V6 Sohc...... would crank and start and run just fine now suddenly will crank but no start, replaced fuel filter and pump,...

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99 explore sport 4.0 L V6 Sohc...... would crank and start and run just fine now suddenly will crank but no start, replaced fuel filter and pump, spark plugs, wires, crankshaft position sensor, battery alternator and started good......no power to fuse 13 in power distribution box.... it’s not a blown fuse issue it’s a no power to that fuse socket.....I have a second box that I can put in but that would require hardwiring that huge harness of wires....Pretty sure there is a short or an open circuit from Füse 13 and tried using a cable toner tracer just not exactly sure what to do....Also it is doing feel it is getting spark and it is getting air, also tried the inertia switch to no avail

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Charles Totherow
Ford Mechanic

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Charles Totherow
Ford Mechanic

Have you checked for spark and fuel while cranking?

Posted
Charles Totherow
Ford Mechanic

You will have to pinpoint what the engine is missing.

 

Spark

 

Fuel

 

Compression

 

 

All three of these are tested when the engine is being cranked over. There are two way of checking for fuel. Fuel pressure and injector pulse. Both are very important and must be present for the car to start. Fuel pressure is self explanatory. You just hook up the gauge and see what the reading is. Injector pulse is check with a noid light. The injector gets unplugged and the noid light gets plugged in to the injector clip. With the engine cranking over, this light must blink. This is the signal to the injectors from the computer. You can have all the fuel pressure in the world, but it wont matter if the injector is not pulsing gas into the cylinder like it should! All three tests play a very important part in diagnosing a no start condition. Be extremely careful when doing these tests. A simpler test would be to see if it runs on starting fluid. If it does, then you know you have spark and compression and you simply have a fuel delivery problem. Glad I can help. Please let me know if you have any further questions.

Posted
Charles Totherow
Ford Mechanic

Please let me know if you are satified with my assistance

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Charles Totherow
Ford Mechanic

Please let me know if you are satified with my assistance

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