Quantcast
Jump to content

Wild child 911

2018 Hisun 450 EFI UTV Low Power

Recommended Posts

I have a 2018 model Hisun 450 EFI UTV. I have done over 6000 trouble free kilometers. About 4 weeks ago i felt that utv was not performing like it should. Done a compression test and found to be low. Replaced rings as they were worn. I drive in a very dusty environment. The problem of low power is still there. I have checked cam timing, valve clearances, compression up to 9.5 bar, done leak down test and valves are seating, stripped and cleaned fuel pump, removed and cleaned throttle body, checked for leaks on throttle body manifold, replaced spark plug, tested stator coil, tested hv coil,  checked all electrical connections, checked injector. UTV starts easily and idles for 5 seconds and cuts out. When utv starts, it will rev up the first time and then start to miss as if it goes into a limp mode. If i lift my foot of the accelerator utv will idle for 2 seconds and then die. It starts immediately again. Would the air flow/ air pressure sensor or exhaust gas(lambda) sensor cause this. I cannot test them as dont know the correct values. Any suggestions will be highly appreciated.

Share this post


Link to post
Share on other sites


Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Similar Topics

    • By Michael Busby
      Hi guys. I'm new here. Just picked up a 2010 Hisun/Tomoto 800UTV yesterday. It's missing one of the body pieces just behind the driver side front tire. Does anyone have a wrecked or parts buggy they are selling parts. Or possibly know where I can find this piece? 

    • By justingrider
      Good morning everyone, appreciate any help on this.  I picked up a 2013 Hisun 800 for a project.  Previous owner had fried a lot of the electrical with a bunch of aftermarket audio equipment, so I have been replacing all of the wiring to give it a fresh start.  I'm 95% there with a couple of plugs I can't figure out where they need to be routed and the reason for me reaching out for help here.
      1.  A female 2-port white plug that comes off the end of the main harness, close to the side where the terminal hook ups tap into the battery.  It has a Blue/black-stripe wire and a White/blue-stripe wire. (Pictures: https://ibb.co/m9PRDqX and
      https://ibb.co/9pHZsFj). I'm assuming it is another single offset fuse or module like the other pieces around it but can't find anything on what it might be or that wire color combination in the manual/wiring diagrams...anyone know what this guy goes to?
      2.  On the crank position sensor (torque sensor), the wires that I have coming off of that are a green wire and blue/light-gray-stripe wire (https://ibb.co/FmJLJfs)...any idea on where this guy is suppose to plug in to?
      Again, thanks for any help you can provide!
      -Justin
       



    • By JDH
      Hi guys,
      I have a Rural King version of the Hisun Sector 250 with about 75 miles and 15 hours on it.  It just started being difficult to start and idle.  But if I hold in on the gas a little it will start and run until I left off.  It also runs good and will run good until I stop then it idles for a few seconds then quits.  Its about 4 months out of warranty.  Battery voltage is fine before, during, and after starting.  Oil is clean and clear.  Gas is fresh.   I can hear the fuel pump spool up when I turn the key to actually start it, not when I turn it to the on position though like on most other UTV's I have owned.  Its really odd and has me perplexed.  The only other thing that I have noticed is that the engine temp indicator on the left side of the dash only indicates one bar regardless of how warm the engine is.  Other than that, it runs great.  Just hard to start and won't idle.  Any suggestions?  It has me  perplexed.
      Thanks
       
      Jason
    • By Beetle1
      2012 hisun 700 efi front runner  turns over hard and the valves don't move and no compression  any ideas on what could be wrong with it ???? Thanks in advance 
    • By Mac250
      Just purchased a 2018 Hisun Sector 250. The gear shift is hard to engage. Tried depressing the brake pedal, no change. Tried with the engine running and turned off, no change. The gear shift cable, from the dash to the trans seems to be grinding. With my hand on the cable I can feel it grinding, vibrating, as the gear shift is moved up or down. Can this cable be removed and greased or does it just need to be replaced?


×
×
  • Create New...