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Thread: tuning help/gasconsumption

  1. #1

    Array
    Status
    Offline
    Join Date
    11-19-2011
    Posts
    34
    Location

    Albuquerque, NM
    Vehicle

    1989 Mitsubishi Mighty Max
    Engine

    G63B

    tuning help/gasconsumption

    Hi Guys,

    MM 2L is not running well. Issues are:

    - under twenty MPG
    - dieseling after shut off

    motor rebuilt motor with approx 30k miles.

    Did tune up: distr. cap, rotor, plugs, ignition wires.

    Weber carb w/ electric fuel pump.On 2/14/17 a diagnostic specialist worked on it and mileage has decreased significantly.

  2. #2




    Array
    Status
    Offline
    Join Date
    03-20-2011
    Posts
    4,525
    Location

    Pittsburgh, PA
    Vehicle

    1980 Dodge D-50
    Engine

    G54B
    Ok - what was the "diagnostic specialist" trying to fix on your truck? My bet is either the choke is not working, the mixture is adjusted rich, idle speed too high, or a combination of all three. Timing may be advanced as well. You need to undo what he did to get your mileage back.
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  3. #3

    Array
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    Join Date
    06-15-2014
    Posts
    3,271
    Location

    Adelaide, South Australia
    Vehicle

    1985 Mitsubishi L200
    Engine

    G63B
    +1 on pennymans' recommendations. Some shops have absolutely no idea about old school and can undo a good tune with a couple of turns of a screwdriver. They do dumb sh*t like adjust the idle speed with the distributor and open the throttle stop too far or mess with the air/fuel screws etc. You are lucky that you've done the Weber swap and there aren't many adjustment points. The factory Mikuni can become a nightmare when someone starts randomly turning screws... Be aware that the jetting for the 32/36 Weber out of the box isn't ideal for the G63B and using the right jets + a trial and error tune can make a night and day difference in performance and power. OOC what pump are you using (you've probably posted it up previously but I'm too lazy to search lol)
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