Page 1 of 2 1 2 LastLast
Results 1 to 10 of 15
  1. #1

    03 msx 140 trouble

    hey guys

    First just wanted to say thanks for all the info and knowledge

    What i got going on is the ski starts right up runs good most of the time tops out at 6700 to 6800 rpms at wot. every now and then the ski acts like the emm is controlling the rpms and takes them down to nothing like drops 200 to 300 at a time all the way to idle. If i get off the throtle and back on takes right back off normal the runs fine for a couple of mins
    and it sounds like when the ski is in reverse and the emm is limiting the rpms

    any help would be helpfull
    thanks


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    36,572
    +1
    1,272
    My first guess would be the TPS is failing. It might be something else, but it is a good idea to have a spare TPS on hand anyway.

    Do you have another MSX 140 that you can swap parts between?

    Ficht TPS versions, sources


    Do you see a red lamp or Check Engine message when the problem occurs?

    Polaris Ficht Fuel Injected Engines

  3. #3
    hey thanks for the reply

    no red light on display or message
    but from what i have red sounds alot like it is going into slow mode
    i do have a 2003 genesis I would the tps be the same
    also would fuel have anything to do with the problem ?

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    36,572
    +1
    1,272
    Quote Originally Posted by Jayman View Post
    hey thanks for the reply

    no red light on display or message
    but from what i have red sounds alot like it is going into slow mode
    i do have a 2003 genesis I would the tps be the same
    also would fuel have anything to do with the problem ?
    Slow mode will limit RPM to a specific RPM level.
    3500RPM, if memory serves.
    Reverse and Neutral will limit RPM to the same.

    If you engage reverse when the engine is running normally, and then squeeze the throttle, you will hear and see what the RPM limiter feels like.

    Your Genesis might even have the same RPM limiter when in reverse.

    The TPS on your 2003 Genesis should be interchangeable with the MSX 140. Be careful not to overtighten the TPS bolts - they do not need much torque. Specs are in the Service Manual (click below).

    What are you asking about fuel?
    Is there a problem with the fuel?

  5. #5
    It does sound like slow mode,
    I would check to make sure the ECM is not overheating. Look in the hull right around the cover over the coupler, you should see a plastic hose "T" 5/16 or 3/8 hose. one of the hoses will clamp on the manifold on the bottom rear side and the other will clamp the the front cover on the engine, make sure these smaller hoses are not clogged.
    Make sure you are getting water flowing thru the ECM,
    Servce the Thermostat area as well.
    Another thing to check is the temp sendng unit, remove the plastice exhaust pipe on port side, remove the 8mm bolt then pull out the sending unt. Make sure the wires are not broken. also run a resistance check while moving the wires around. If the wires are broke you will get slow mode and no light on the dash.

  6. #6
    i will check the engine sounds the same as when in reverse when it happens
    but if it was an overheat situation would letting off and back on clear it

    once starts doing it i can let of and right back on again as fast as i can and clears it

    didn't know if the tps got reset at idle or zero throtle

    and on fuel what octanie to run the genesis runs the same with no problems

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    36,572
    +1
    1,272
    Quote Originally Posted by Jayman View Post
    ...the rpms and takes them down to nothing like drops 200 to 300 at a time all the way to idle.

    If I get off the throttle and back on takes right back off normal the runs fine for a couple of mins
    and it sounds like when the ski is in reverse and the emm is limiting the rpms...
    Quote Originally Posted by thunder955 View Post
    It does sound like slow mode,

    I would check to make sure the ECM is not overheating...

    Service the Thermostat area as well.

    Another thing to check is the temp sending unit, remove the plastic exhaust pipe on port side, remove the 8mm bolt then pull out the sending unit.

    Make sure the wires are not broken. also run a resistance check while moving the wires around. If the wires are broke you will get slow mode and no light on the dash.


    Slow mode would not reduce RPM down to idle.

    That the engine power and full RPM will resume right away if you release and re-apply throttle indicates that it is not an actual overheat condition.

    It could be a broken temp sensor wire, or EMM overheat, but my first guess would be the TPS is failing.

    You can check the EMM for Service codes;
    How to read Polaris Ficht EMM trouble codes without special software or a computer

  8. #8
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    36,572
    +1
    1,272
    Quote Originally Posted by Jayman View Post
    ...what octane to run the genesis runs the same with no problems
    89 octane is the minimum recommended for gasoline with ethanol blend.

    I run 91 octane in both my Ficht injected PWC, mostly to avoid the ethanol. Premium fuel in my region has zero ethanol in some brands.

  9. #9
    I just had one today I was working on. it would run great for several miles and then would go into slow mode no lights on dash. just as quick as you would let off the throttle and hit it again it would run fine for a short distance and you it would repeat this, I removed the seat and shot all the Cylinders with a tamp gauge and all seemed good. First thought was the ECM running hot, removed the hose from the output side and back blew and was plugged. I found shells blocking the hose right at the "t" I explained in the other msg. flushed all lines and now runs great.

  10. #10
    I just caught it was reducing the rpm all the way to idle. slow will reduce no lower than 3000-3500 rpm. Let us know

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. How do you reset trouble codes on 03 msx 140
    By hubsta in forum MSX/Matrix
    Replies: 0
    Last Post: 07-26-2013, 06:58 PM
  2. reverse rpm limit 03 msx 140
    By boosis in forum MSX/Matrix
    Replies: 1
    Last Post: 10-14-2007, 05:09 PM
  3. 03 msx 140 impeller replacement
    By theedawgpound in forum Polaris How To & FAQs
    Replies: 3
    Last Post: 08-09-2007, 10:53 PM
  4. 03 msx 140
    By Jayman in forum Polaris How To & FAQs
    Replies: 5
    Last Post: 07-24-2007, 11:49 PM
  5. Thoughts/potential problems on '03 MSX-140 D.I.
    By Nefarious in forum Polaris Open Discussion
    Replies: 3
    Last Post: 06-27-2007, 09:22 PM

Posting Permissions

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