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'91 Mitsi Minicab wont start after warmed up

Discussion in 'Mitsubishi Minicab' started by TooManyProjects, Aug 1, 2020.

  1. Heiny

    Heiny Member

    Hold on, this has an aftermarket carb? Do you have a manual choke? There could be several different things at work here.
     
  2. It appears to be the original carb. BUT, i am also not sure what original equipment is on this rig.
    No manual choke. Choke operates as it should. Or at least appears to. Would work better if the tin foil pipes from the exhaust manifold werent rotten. But it does work.
     
  3. It always ran a bit rich. But i have thought the choke was sticking slightly closed, but its not. Im positive it need a carb rebuild.
     
  4. I did some snooping today. So far, all things point to the Mikuni being the factory carb for a 3G83 engine. To my knowledge, the only thing that has been done to it, prior to my owning it, is a clutch pack, and a starter rebuild. But i have no knowledge of the owner before that. I got it from my father in law who had it for quite some time. And he's not one to work on, or have anything worked on. Haha!!
     
  5. Koffer

    Koffer Donating Member

    Sounds like the float might be an issue and not closing the needle and seat all the way allowing it to overflow into the intake
     
    TooManyProjects likes this.
  6. I thought about that. And still think its a possibility. But would that make it not start or hard to start when the engine is up to running temp?
     
  7. Koffer

    Koffer Donating Member

    If it’s too high it could be overflowing and flooding it out when you shut it down . The gas in the lines will heat up and raise the pressure pushing even more gas into the intake when the engine is heat soaking
     
  8. Limestone

    Limestone Active Member

    Too Many projects said:
    I thought about that. And still think its a possibility. But would that make it not start or hard to start when the engine is up to running temp?

    I agree with Koffer, yes it would!
    Limestone
     
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  9. Jigs-n-fixtures

    Jigs-n-fixtures Well-Known Member

    I recommend that you go to the G&R Imports site, and go through their troubleshooting guide. 90% of problems folks blame on the carb are something else. Most of which are easier to get the parts to fix, than the carb.
    https://www.grimports.com/maintenance-tips
     
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  10. Limestone

    Limestone Active Member

    I also agree with Jigs! One thing for sure, "If it's not one thing, it's another!" LOL!!!
    Limestone
     
    TooManyProjects likes this.
  11. That makes total sense. Now. Haha!
    So what youre saying is, its quite possible, that i have carb issues, and not a timing issue?
    In the little monsters defense, it does sit quite a bit from time to time.
     
  12. I live in Missouri, so GR Imports is only a couple hours away. Ive been on their website a few times just rooting around. Ill check out the trouble shooting thing. Thanks!!
     
  13. Uhhhhhh. I just thought of something.
    I went to GR Imports website and looked at the trouble shooting thing.
    I was unaware that there was coolant running thru the carb, to control the "thermostat" for the fuel inlet/choke.
    Now that i now that, i did put a new thermostat in it when i got it. I flushed the cooling system before i ran it anywhere but idling in the shop. The thermostat i put in it, was the right temp, size, and offset. HOWEVER, it did not have the "bubbler" in it. So, i drilled a 1/8 inch hole where the "bubbler" should have been. And it always ran cool. In other words, it took a very long time for the engine to warm up. Much less to move the temp needle. And THAT may account for the carb trouble.
    Whats your thoughts on that?
     
  14. Jigs-n-fixtures

    Jigs-n-fixtures Well-Known Member

    The wet choke is supposed to get flow before the radiator does. And, the lines to the wet choke are usually the first thing to clog. It is pretty common for them to get restricted, and not get enough heat to open the choke fully. Also, the other issue, is the carb and head are teh high points on the cooling system, and unless you bleed teh air correctly out of the head, the air will never come out of the system.

    On most American cars teh radiator is teh high point, and the hole in the thermostat is there to let any air in the system bleed up to the radiator. The 1/8 hole sounds really big on these engines they are pretty tiny.
     
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  15. In hindsight, the hole i drilled should have been 1/16 or smaller. The original thermostat has a hole in it, but there is also a tiny "free floating" metal tab in the hole, and it takes up better than half of the hole. Ill post a pic of the original thermostat when i get home this afternoon.
    Knowing what you guys have told me, and what i found on the GR Imports website, i will be giving the cooling lines at the carb and vacuum lines a solid going over, before i start dismantling the front of the motor for a timing belt it may not need.
     
  16. ALSO.....
    About a year ago, i took it to my local Chevy dealer, and had them flush the cooling system. I assumed, they purged the air from the system, since they used a flush machine to flush the cooling system.
     
  17. Heiny

    Heiny Member

    Have you tried to pull a spark plug out when it is warm and in a no start condition to check for fouling?
     
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  18. Not yet. I was planning on doing that for sure. Been busier than i would like the last couple days, and haven't had a chance to start on the little feller. I have gotten a lot of tips and places to start looking, from all of you. Im hoping to get some time this week to get it in the shop and start chasing down all the possibilities that you guys have given me. I would be willing to bet money that the plugs are fouled for sure. Im going to start at the wet choke on the carb and move from there, i think. As much as i dont want to, im pulling the carb and giving it a once over. And that will lead to tracing down vacuum lines, coolant to the carb lines, fuel lines, etc. And try to eliminate as much of the "cheap and easy" stuff as possible.
    If i find anything strange, ill post pics.
     

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