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
  • 14,585 Answers

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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Depending on the vehicle, your underhood powerbox may be marked with EEC and Diode. If you have an Owners Manual, look for the Relay box layout. Often the Horn Relay is the same part# as the other relays and can be used to test as a spare relay.
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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)...

7_6_2012_11_20_57_pm.jpg

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


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a diesel needs so much more (stuff) than a gas engine
but you'll get better milege with the diesel espesicialy if towing

things right off the top of my head that are different
Power brake booster and master cyl unit
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
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hope you got a doaner truck for all this stuff

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