Question about 2003 Ford E250

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Stalls when hot. have spark, fuel pressure and injector pulse. crank no start

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  • cusimano69 Aug 22, 2008

    yes it tries to start but won't kick over. Runs till its hot, then shuts off. Just changed thermostat for overheating but no luck.

  • yadayada
    yadayada May 11, 2010

    If you have spark fuel press and injector pulse then it should run, does it try to start?

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Four things you need to have combustion - Spark, Air, Fuel, and TIMING. I would look into the crank position sensor wiring. This would effect the timing. Then no matter how much spark and fuel you have, it will not start. If the crank position sensor goes out, it will die while you are driving it, but it that sensor goes bad it will not start back up. But if there is a back connection in the wiring especailly on the ground side, the the resistance will build up when the vehicle get hot. Which could cause it to make it seem like a fault has occured in CKP sensor. A scanner might catch a code for this. A good scanner that can graph will be the real way to go to know for sure.

Posted on Oct 02, 2008

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Hi there:
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 fuel trigger. Both are very important and must be present for the engine to start. Fuel pressure is self explanatory. You just hook up the gage and see what the reading is. Fuel trigger 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.

Compression tester, spark tester, fuel pressure gage and noid light are all accessible at your local auto store. All three tests play a very important part in diagnosing a no start condition. Be extremely careful when doing these tests.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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