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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » 5.0 conversion power drain issue

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    7/30/2020 5:20 PM  #1

    Cougar man
    FYI FORD Member

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    From: Grand Prairie TX
    Registered: 9/22/2019
    Posts: 18

    5.0 conversion power drain issue

    This is not Mustang but it is in the same family. I just bought a 94 Ranger with a 5.0 conversion from a Ford explorer (engine, trans and rear) .
    Truck runs good but it has a drain on the battery when it sits. The first thing I found when hooking up the NEW battery I could hear a relay click (ignition off). On top of the throttle body the throttle position sensor clicks when the battery is connected. I believe this should only power up with ignition.
    Any help with this issue, i.e. what wires to trace or if it should be hot.
    Thanks BTaylor
    Dallas
     

     

    7/30/2020 5:27 PM  #2

    BTaylor
    FYI Addict

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    From: Carrabelle, FL
    Registered: 4/02/2013
    Posts: 127

    Re: 5.0 conversion power drain issue

    68 Cougar XR7 347 stroker T5 3:80
     

    7/30/2020 8:47 PM  #3

    Bullet Bob
    Senior 24-7 FYI Addict

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    From: Montrose, Colorado
    Registered: 4/01/2013
    Posts: 4,887

    Re: 5.0 conversion power drain issue

    I believe that photo is of the Idle Air Bypass solenoid, not the TPS.  The IAB takes Vehicle power from the EEC power relay when the key is turned to Run.  Since I have no idea what the PO used for the EEC power I will just say that that relay could be stuck and is constantly providing 12 v to the IAB.  There could be a relay box called a CCRM (Constant control relay module) that contains the EEC relay and AC relay and Fuel pump relay.  Or....they could have just installed separate Bosch type relays for these functions. 
    I recommend you obtain the proper wiring diagrams for the Explorer EEC-V control system and see if you can determine how that engine has been boot-legged in there.

    Edit:  If you can ID the CCRM (about 3X3" or 3X4) you can try plugging in a replacement.  Ford used these in everything as far as I know from 94 on.  There should be an ID stampped on the back (R something as I recall) and you can probably find a replacement in most boneyards.  In the 94-95 Stang it was mounted up near the radiator on the core support.

    Good luck...keep us in the loop.

    BB1

    Last edited by Bullet Bob (7/30/2020 8:57 PM)

    "you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
     

    7/31/2020 7:16 AM  #4

    Nos681
    Senior 24-7 FYI Addict

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    From: Atlantic Mine, Michigan
    Registered: 7/14/2016
    Posts: 3,336

    Re: 5.0 conversion power drain issue

    If memory serves me correctly, the IAC is constantly changing position which is controlled by the ecm.

    On-off-on-off....constantly during operation.

    They will get clogged up.
    Try cleaning it up and see if it changes.
    Start with simple and easy.

    I’m not familiar with the EEC-V...yet.

    Last edited by Nos681 (7/31/2020 7:18 AM)

     

    10/10/2020 11:23 PM  #5

    Nos681
    Senior 24-7 FYI Addict

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    From: Atlantic Mine, Michigan
    Registered: 7/14/2016
    Posts: 3,336

    Re: 5.0 conversion power drain issue

    Found topic about operation of IAC.
    By Tom Moss

    http://tmoss.efidynotuning.com/IAC-IAB%20Function%20and%20Idle%20Speed%20Setting.doc

    Last edited by Nos681 (10/10/2020 11:23 PM)

     

     

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