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Starting / Idle Issues: At A Complete Loss-- Any Suggestions?

Discussion in 'Under the Hood' started by gmeline, June 25, 2017.


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    1. gmeline

      gmeline New Member

      Joined:
      June 25, 2017
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      City, State:
      Cupertino
      Year, Model & Trim Level:
      2002 Explorer Sport Trac
      2002 Ford Explorer Sport Trac 4.0 SOHC 185k
      Problem: doesn't want to start cold unless I turn key to run a few times beforehand. once it kicks-over, it wants to die, rpm's up and down, until finally smoothing out. poor idle. everything else works great.

      I've already tried and replaced:
      alternator
      battery
      air filter
      Fuel pump and filter
      MAF sensor
      IAF sensor
      EGR valve and vacuum solenoid valve
      PCV valve
      vapor can vent valve
      spark plugs and wires
      ran compression test: 200, 180, 180, 180, 180, 180
      conducted smoke tests, propane test, starter fluid tests for vacuum leaks
      tested fuel pressure: at 65 or above

      took to dealer for diagnostic:
      they said retrieved CTC P01125 TP sensor intermittent circuit fault and said it had vacuum leak at the upper intake manifold and gasket area and needed new throttle body. I replaced intake manifold gaskets and new throttle body.

      NOTHING FIXES IT!!!

      any ideas, suggestions, or solutions would be greatly appreciated.
      I'm at a loss.
       
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    3. bobditts

      bobditts New Member

      Joined:
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      City, State:
      las vegas, Nevada
      Year, Model & Trim Level:
      2007 Explorer XLT
      how do all the ground wires and contact points look in the engine bay?
       
    4. gmeline

      gmeline New Member

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      City, State:
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      Year, Model & Trim Level:
      2002 Explorer Sport Trac
      good idea. any particular ground wires that you would recommend inspecting? I'm actually wondering if the cause of the problem might be wiring with the ignition switch in the steering column.
       
    5. gmeline

      gmeline New Member

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      City, State:
      Cupertino
      Year, Model & Trim Level:
      2002 Explorer Sport Trac
      tried new engine coolant temperature sensor as well as replaced thermostat and thermostat housing.
      Engine still "flops" when you start it cold.
      Give it gas though and after a few seconds, runs fine.

      HELP!
       

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