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Minicab Won't Idle

Discussion in 'Mitsubishi Minicab' started by Jim_Gill, Oct 28, 2019.

  1. Jim_Gill

    Jim_Gill New Member

    I have a U42T Minicab dump with the 3g83 - Mikuni carb. The engine starts fine and idles up with the automatic choke - no issues. Once warmed up, it will not idle below 2300 rpm. Turning the idle down will cause the engine to start rolling the (rpms up/down) until it eventually stalls. Running the truck down the road - truck runs great until the first stop sign - then stalls.

    Points to note:
    Carb is a new factory rebuilt from Yokohama - The old card had the same result/behavior as the new carb.
    Engine is a new rebuild from G&R
    New Cap/Rotor and points module.
    Played with the timing as much as possible at 2300 rpm
    Played with fuel air mixture screw - no luck
    Fuel pump is an aftermarket 2 wire - pumps fuel as expected
    Vacuum lines - no leaks - but I do not have confidence that they are connected to the correct ports. The vacuum advance is correct based on the Russian diagram (https://mitsubishi.epc-data.com/minicab/u42t/hfdv9/intake-exhaust/emission-control/)

    So any takers on this?

    Here is a couple of Videos:

    Last edited: Oct 28, 2019
  2. swat1018

    swat1018 Member

    I'm in the same boat. My '95 just started to stall when idling at stop signs, etc today.
  3. Mini_hijet

    Mini_hijet New Member

    Has anyone solved this? My 1990 s83p Hijet is having the same problem. Any help is appreciated, thank you in advance.
  4. Jim_Gill

    Jim_Gill New Member

    I haven't been able to figure this out - its kicking my ass. My staff are using it for hauling manure and I just have the idle screw cranked to keep t running. It has to be a vacuum issue - I really don't know. The old engine drank a quart of oil per week but at least idled.

    I have the Suzi in my garage now doing some front end work. Once I get that up again I will pull the Mitsi back in and try to work it out.
  5. Jigs-n-fixtures

    Jigs-n-fixtures Active Member

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