E4OD Peoblems! Need help

Discussion in '6.9L IH & 7.3L IDI Diesels' started by Austinfee, Nov 7, 2018.

  1. Austinfee

    Austinfee Registered User

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    For starters,
    1990 f250 7.3 Idi 4x4
    E4od with sterling 10.25 (4:10 gears)

    The short story is, I had to replace my rear axle because the hub retainer nut broke and stripped my spindle threads (at this point my rear and transmission are in great working order).
    I found a new axle housing and began swapping my 4:10 gears that were in my original axle. Only thing I replaced was bearings, crush washer, & pinion nut.
    My first test drive, first to second gear was a hard shift. Second gear to forth gear acted as if they were one continuous gear ( rpms stayed at 2k with no drop in rpm between gears) and over drive worked if it wanted to.
    The truck sat for 3 months before the first test drive. No flashing OD light & no check engine light.

    Less than a year ago I changed
    -vehicle speed sensor and wiring
    -pencil gear and drive gear for speedometer
    -speedometer cable
    -fluid and filter
    -rear speed sensor and wiring
    -neutral safety switch

    I am stumped as to why this transmission is acting up considering It worked so well before it was parked

    Let me know what you guys think, thanks
     
  2. icanfixall

    icanfixall Official GMM hand model

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    May want to check the throttle position switch voltage on the center wire at the switch. The tps switch is located on the drivers side of the injection pump. It MUST register between .96 to 1.2 volts on a warmed up engine key on engine off idle position.
     
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  3. trackspeeder

    trackspeeder Stone crusher.

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    You could try scanning for codes. 1990 is the early TCM so it might have a stored code. With the early TCM you can't count on the OD off light flashing.

    Skipping third gear could be multiple issues. Faulty TPS, faulty VSS, faulty TRS or faulty tach sensor. Take a look at the ABS sensor too. Seeing how the tranny was working fine before the axle work.
     
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  4. Austinfee

    Austinfee Registered User

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    Ok, I checked the TPS voltage

    First I started off by just making sure it was getting 5v. Than I checked the return voltage ( should be about 1v ). It was 3.8v at idle and the voltage dropped as I “gave it fuel”

    Going to start by replacing the TPS

    Have you ever heard of this happening?
     
  5. Thewespaul

    Thewespaul Supporting Vendor Supporting Member

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    That’s very common. Ford actually had a recall of the early fipls because they were so failure prone.
     
  6. trackspeeder

    trackspeeder Stone crusher.

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    This is common. Most last about 50k miles. Some don't make it out of the box.:eek:
     
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  7. Austinfee

    Austinfee Registered User

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    New TPS fixed the problem. It shifts great now. Thanks everyone
     

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