UTV Chat talk Forum Board Rhino Clones ODES UTVS HiSun Massimo Motor Bennche Qlink Linhai Supermach USTitan 700cc UTV Cheap 500cc UTV Wholesale
Results 1 to 2 of 2

Thread: MSU 500 runs rough as it warms up

  1. #1
    Newbie
    Join Date
    Nov 2018
    Posts
    1
    Post Thanks / Like

    MSU 500 runs rough as it warms up

    Started running rough several weeks ago. No guts on hills or with load, wont idle, sputters and stalls after it starts to warm up. Will start back up but the RPMs drop quickly and it stalls. Had MAP/MAF, Fuel Injector and TPS codes so replaced all 3 but still had the issue. Have checked/adjusted the valve gap already too. Reset codes and it kicked out a O2 Sensor (131) so replaced it also. Still acting the same way. Now I get a 031 (O2 Heater). Seems like it is running really rich at start up(Plug is really wet). It is a year old with about 70 miles on it. Am wondering if the Coolant Temp Sensor has anything to do with it. It gets progressively worse as it warms up.

  2. #2
    Newbie
    Join Date
    Feb 2019
    Posts
    1
    Post Thanks / Like

    possible cause

    Quote Originally Posted by RockyRider View Post
    Started running rough several weeks ago. No guts on hills or with load, wont idle, sputters and stalls after it starts to warm up. Will start back up but the RPMs drop quickly and it stalls. Had MAP/MAF, Fuel Injector and TPS codes so replaced all 3 but still had the issue. Have checked/adjusted the valve gap already too. Reset codes and it kicked out a O2 Sensor (131) so replaced it also. Still acting the same way. Now I get a 031 (O2 Heater). Seems like it is running really rich at start up(Plug is really wet). It is a year old with about 70 miles on it. Am wondering if the Coolant Temp Sensor has anything to do with it. It gets progressively worse as it warms up.
    I had the same issue about 1 year ago and it ended up being a blown head gasket. I could get it to start and run but, the exhaust was white and noticed that the radiator overflow was empty.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •