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HELP! 93 ford explorer wont start!

Discussion in 'Stock 1991 - 1994 Explorers' started by sonnyandveronica, April 22, 2011.

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    1. sonnyandveronica

      sonnyandveronica New Member

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      My 93 ford explorer wont start. The engine turns but it wont start. I was told there is no spark. I replaced the module and the crank shaft sensor and it still wont start. I was told it could also be the computer but could it be anything else?
       
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    3. andre 244

      andre 244 New Member

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      is check engine ligth if it go on when u turn key ? may have bad fuse or ecm relay
      do you hear the fuel pump working
       
    4. sonnyandveronica

      sonnyandveronica New Member

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      no check engine light i was told the pump is working
       
    5. andre 244

      andre 244 New Member

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      whe to key is on you must have check engine ligth on the after about 3 second go off
      if not youre ecm not geting any power
       
    6. sonnyandveronica

      sonnyandveronica New Member

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      what is the ecm
       
    7. andre 244

      andre 244 New Member

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      engine contol module "computer" also call ecu engine control unit
       
    8. sonnyandveronica

      sonnyandveronica New Member

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      The light does not come on so does that mean i need to replace the computer or what would cause it to not get power
       
    9. andre 244

      andre 244 New Member

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      here what you do turn key till dash lith are on check if check engine is on
      if yes good sing
      if not check fuse or you're bulb may be burnt out
      if you can check if you have injector pulse by diconecting plug and put a 194 bulb it should flash when you try to start
       
    10. sonnyandveronica

      sonnyandveronica New Member

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      The fuse to the check engine light or to the computer. And where is the plug to check the injector pulse. (what is that for)
       
    11. Slatch

      Slatch New Member

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      First thing I would check in your situation is the PCM relay. Look at your owners manual, it is located in the power distribution box under the hood. Swap it with another relay of the same style and see if there is any change.
       
    12. sonnyandveronica

      sonnyandveronica New Member

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      in my owners manual under the power distribution box i cant find the PCM relay which one is it
       
    13. MrShorty

      MrShorty Explorer Addict

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      Sometimes it is labeled EEC relay.

      A wiring diagram (even the ones in Chiltons) will help you see how the PCM gets power. The EEC relay might be working because the fuel pump relay should require power from the EEC relay to run the fuel pump.
       
    14. sonnyandveronica

      sonnyandveronica New Member

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      So if it is not the eec relay what else might i want to check before going and buying a new computer.
       
      Last edited: April 23, 2011
    15. MrShorty

      MrShorty Explorer Addict

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      The rest of the PCM power and ground circuits.
       
    16. sonnyandveronica

      sonnyandveronica New Member

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      Is there anything specific I should check or where and how should I check. And Thanks!!!
       
    17. MrShorty

      MrShorty Explorer Addict

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      Power circuit: I'd probably start at the PCM and make sure the three power wires have 12 V with the key on. If yes, then the PCM power circuit is good. If not, then move back to the relay and make sure it is closing. With your wiring diagram, continue up the power circuit until you find 12 V. The problem will be between the point in the circuit where you have 12 V and the point where you don't have 12 V.

      Ground circuit. Assuming you have power to the PCM, grounds are usually best checked with a DVOM. Measure the voltage drop across the three grounds (positive lead at the PCM, negative lead at B-. There should be very little voltage drop (several mV at most). An ohmmeter could also be used with the PCM connector disconnected. There should be essentially 0 ohms resistance between the connector and B-.
       

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