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Thread: No Power Over 45 mph

  1. #1

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    06-16-2019
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    Location

    Manor, TX
    Vehicle

    1989 Dodge Ram 50
    Engine

    I.D.K.?

    Question No Power Over 45 mph

    Howdy all, just bought my first 50 this week('89, 2L, 4cl, 2WD), so I'm new to these trucks and the engines. She does well in first gear, but has very little power generally(0-40 takes about a minute), and can't go over 50mph unless it's downhill. Brand new Carburetor, brand new vacuum pump. Throttle opens fully and has good tension. I'm thinking it's the distributor, but again I don't know these trucks yet. Any ideas?

  2. #2

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    06-15-2014
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    6,059
    Location

    Adelaide, South Australia
    Vehicle

    1985 Mitsubishi L200
    Engine

    G63B
    Hi and welcome to mightyram. If the vacuum advance on the distributor is shot, it will nerf acceleration badly. Normally no top end power is a carb related issue as the stock Mikuni carb is prone to secondary solenoid/servo failure (the diaphragms in them split, not only preventing the secondary throat from opening but creating a vacuum leak in the process) If the original coil is still fitted, it is worth considering replacing it. A weak spark will also cause loss of power and fuel economy. This issue could also could be something as simple as a bad engine tune.
    Start by testing the vac advance and work your way from there.
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  3. #3

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    07-25-2018
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    29
    Location

    Center Conway, NH
    Vehicle

    1989 Dodge Ram 50
    Engine

    G63B
    I have a G63b dist. for sale if that ends up being your problem, only 6 months old

  4. #4

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    06-27-2015
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    418
    Location

    Bothwell,Ontario
    Vehicle

    1991 Dodge Ram 50
    Engine

    4G64
    Replacing my coil, pulling a few litres of water through the engine through a vaccum hose brought my truck back to life.

    I would also suggest a good tune up including replacing the O2 sensor.

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