Question about 1992 Ford F250

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What scanner should I use for transmission troubles on a 1992 f250 7.3 diesel?

My manual says that the diesel model of this truck does not use the eec iv so most of the available obd I scanners won't help. Thanks

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  • Ford Master
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The manual is right. Your transmission is run by vacuum and pressure from the pump. What's it doing?

Posted on Apr 22, 2015

  • 1 more comment 
  • Tracie Johnson
    Tracie Johnson Apr 22, 2015

    hi Randy! my transmission shifts hard between 1st and 2nd gear. Am trying to diagnose the problem before taking it in.

  • Tracie Johnson
    Tracie Johnson Apr 22, 2015

    if you can tell me the problem, I would truly appreciate it,thanks.

  • Randy Ohler Apr 22, 2015

    Check the vacuum modulator on the transmission. Also check the vacuum line going to it.



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Where is the EEC relay in a 1992 F-250 with a 7.5 liter

I suggest to check underhood engine bay, according with this wiring diagram, look under EEC (Electronic Engine Control 1992) or PCM (Powertrain Contro Module 1996-1996)...


Fig. 22: Engine wiring - 1992-95 F-Series 7.5L (VIN G), 1996 F-Series 7.5L Federal (VIN G) and 1996 F-Series Pick-up 5.8L (VIN H over 8500 GVW) engines - ZOOM LINK DIAGRAM HERE (top left)

ALso, I suggest to check wiring circuit C185, located in THIS LINK DIAGRAM (top right)

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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Converting ford 460 to 7.3 diesel

wow have you got your work cut out for you
a diesel needs so much more (stuff) than a gas engine
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things right off the top of my head that are different
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fuel system (yes the entire thing)
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transmission (torque converter and final drive gearing )
dash gauges (gas tach won't work on a diesel)
tail pipe (4 inch or bigger)

all this stuff is different on a diesel truck

ohh allmost forgot one thing
Front springs Diesels are twice as heavy as it's gas counterpart

hope you got a doaner truck for all this stuff

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