F250 7.5.l. Problems at lower rpm.

Discussion in '1980 - 1986 Ford F150, F250 and F350 Truck Forum' started by Dtlh2oguru, Aug 30, 2020.

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  1. Dtlh2oguru

    I have an 84 f250 7.5 l. All in all truck runs great. But. At lower rpm 1500-2000 if I punch it. It lurches, hesitates until the rooms get up to about 2500 . causing a problem with a load or up a grade. Timing and electrical is spot on. I'm looking for info on emission schematics and parts. It's a California vehicle no catalyst.
     
    Dtlh2oguru, Aug 30, 2020
    #1
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  2. FTZ HAIC Staff Member Oregon Chapter Founding Member

    Until the "rooms" get to 2500! Thanks for a good laugh, made my day! Room, room!

    Hesitation is usually a lean condition. Check the usual suspects with the carb, floats, idle, accelerator pump, secondaries, etc.
     
    FTZ HAIC, Sep 3, 2020
    #2

  3. Dtlh2oguru

    Thanks for the input. I swapped carbs about 2 yrs.ago. Still having some problems . I'm thinking emissions check valves? California. BS.
    It's hard to find parts and ID the vacuum and emissions doodads. Even my shop manual doesn't give much ink to the 7.5l.
     
    Dtlh2oguru, Sep 5, 2020
    #3

  4. FTZ HAIC Staff Member Oregon Chapter Founding Member

    Is it Ford's manual or something else?

    With the vacuum nipple cap and line plugged, what is the timing at idle?
     
    FTZ HAIC, Sep 6, 2020
    #4

  5. clux Article Contributor Founding Member

    Sounds like it could be an accelerator pump problem on the carb to me.
     
    clux, Sep 7, 2020
    #5
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