2003 Ford Expedition Logo
Posted on Sep 23, 2009
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2003 Expedition hard to start

Turns over and over before starting. starts easier after driving. Takes longer to start after sitting a while

  • Anonymous May 11, 2010

    could be leaking injector,fuel pressure regulator or fuel pump providing there are no external leaks check fuel pressure after shut off and again 2 hrs later (if car smokes when hard to start then most likely leaking injectors)

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  • Expert 173 Answers
  • Posted on Sep 23, 2009
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Joined: Sep 23, 2009
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HI ' sounds like a liking fuel pump check valve ,to test install a fuel pressure tester follow instruction on tester ,turn key on don't crank engine over turn key off and back on again note your fuel pressure should be 38 psi to 48 it should keep 20 psi in system after 10 minutes of just siting replace fuel pump if you loose the pressure

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Check out the fuel pump on an oscillscope
Check the fuel pressure at the fuel rail
Need a clean fuel filter

Check TPS with a scope

I say scope because it will show you
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volt meter only gives you numbers (volts)

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