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Thread: 4D55t in 86 ranger injection pump adjustments

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  1. #1

    Array
    Status
    Offline
    Join Date
    01-17-2013
    Posts
    11
    Location

    Asheville NC
    Vehicle

    1983 Mitsubishi Mighty Max
    Engine

    4D55-T
    Yes, the RPM's were high as could be without redlining and throttle had no effect. Just roared to life and stayed roaring! Pump has been rebuilt now and acts normal, which is to say you can accelerate and idle. I think the injectors probably need cleaning, I have not had the time to pull them and pop test them however. It also needs new glow plugs, and a brake booster.

  2. #2

    Array
    Status
    Offline
    Join Date
    04-29-2014
    Posts
    68
    Location

    los angeles
    Vehicle

    1985 Mitsubishi Mighty Max
    Engine

    4D55-T
    Quote Originally Posted by bellavesus View Post
    Yes, the RPM's were high as could be without redlining and throttle had no effect. Just roared to life and stayed roaring! Pump has been rebuilt now and acts normal, which is to say you can accelerate and idle. I think the injectors probably need cleaning, I have not had the time to pull them and pop test them however. It also needs new glow plugs, and a brake booster.
    I'm going to space out my questions and assumptions, because it feels like you are just dumping all sorts of information about your story into one big jumble, and I feel confused.

    OK, so your pump was sitting for a long time with biofuel in it.
    After several years of sitting you tried to start it.
    It started, and the RPMs jumped up to near-redline, and the throttle had no effect.
    You had the pump rebuilt.
    Questions:
    Did you have a reputable place overhaul the pump?
    Or did you just have someone take it apart, clean it, and put it back together?
    Did they use new parts in the rebuild?
    Did they set the starwheel/smoke screw/diaphragm (aka boost compensation adjustments) back to the factory settings?
    Have you messed around with the starwheel/smoke screw/diaphragm?

    Now that it has been rebuilt, you can accelerate and you can idle.
    But you also say it doesn't want to idle.
    I'm guessing that maybe it idles, but is uneven and eventually dies.
    Questions:
    Does it idle unevenly?
    Does it eventually die if left to idle?
    Is the idle speed OK / What is the idle speed?
    Have you tried increasing the idle speed?

    You mentioned having bad glow plugs. This might be a factor, at least until the engine has warmed up.
    Question:
    Does the vehicle still have trouble idling after it has warmed up?

    You mentioned wanting to know which way to turn the pump in order to change the timing.
    If you are standing in front of the truck, facing/looking at the truck, then turning the pump counter clockwise will advance the timing. Turning the pump clockwise will retard the timing.
    Questions:
    Have you set the timing using the procedure in the manual?
    Do you have the tools (dial gauge, dial gauge adapter) to do so?



    BTW: I just saw this article, which looks to be very helpful, especially in explaining the boost compensation controls:
    http://www.landyzone.co.uk/lz/attach...ines_rev_2.pdf
    Also, you should read this:
    http://dodgeram.org/tech/dsl/more_power/Power_ve.htm

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