Results 1 to 7 of 7
  1. #1
    dcspankie33's Avatar
    Join Date
    Jul 2014
    Location
    Pittsburgh,Pa
    Posts
    49

    2003 msx 140 runs rough while giving it the throttle.

    I decided to make a new post for this problem since it was buried under the last thread of mine.
    Ok here is this issue:
    It will start and idle at about 1100rpm and idle smooth. But when trying to give it the gas it spits and sputters and will never reach WOT rpm. It doesn`t back just runs rough. Also I now have the overheat icon come up on the dash and the red light flashing. Which this was after I replaced the exhaust temp sensor. It did not do that before I put the new one on.
    Here are some things I have done:
    New exhaust temp sensor
    New TPS sensor
    Checked all connections and wires and all good.


    Any suggestions?


  2. #2
    Banned User
    Join Date
    Jun 2010
    Location
    Milwaukee WI
    Posts
    16,708
    +1
    1,324
    Do you have proper fuel pressure? I would put an ohm meter on the exhaust temp sensor and see what you get. Overheat will trip limp mode on the ski. It is easy to confuse the temp sensor plug with an injector plug. Verify you have all of your connections correct.

  3. #3
    dcspankie33's Avatar
    Join Date
    Jul 2014
    Location
    Pittsburgh,Pa
    Posts
    49
    Fuel pressure is 22psi, just changed fuel pump and reattached regulator. Connections are good only had the exhaust temp apart at the time of installing it. It was running good until I changed the fuel pump and regulator.

  4. #4
    Banned User
    Join Date
    Jun 2010
    Location
    Milwaukee WI
    Posts
    16,708
    +1
    1,324
    Put an ohm meter on the new sensor and see what you get.

  5. #5
    dcspankie33's Avatar
    Join Date
    Jul 2014
    Location
    Pittsburgh,Pa
    Posts
    49
    Went do an ohm test on the temp sensor and found out that the new plug on the sensor was not good. The prongs inside the plug were not visible while looking in the plug. I had to tear the plug apart and fix it. The light and overheat icon now stay off. I put it on the water and started running it. If I would just go from a stop to full throttle it would run good. If I tried giving it throttle gradually, it would sometimes run rough a little before it would get to full speed. Any Ideas?

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    36,593
    +1
    1,275
    Quote Originally Posted by dcspankie33 View Post
    ... I put it on the water and started running it. If I would just go from a stop to full throttle it would run good. If I tried giving it throttle gradually, it would sometimes run rough a little before it would get to full speed. Any Ideas?
    Perhaps the injector voltage is sagging at RPM above 2500 and below about 5500.

    Can you set up a test to monitor voltage on White/Red wire while the engine is running on the water? Watch for voltage dropping below 45 volts as engine RPM slowly increases with the jet pump in the water, under load.

    If the voltage does reduce as RPM rises above idle that usually means the EMM needs repair.

  7. #7
    dcspankie33's Avatar
    Join Date
    Jul 2014
    Location
    Pittsburgh,Pa
    Posts
    49
    I will try that next time I put in the water. Thanks.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. 2003 MSX 140. rough running issues. Temp related?
    By Britpilot in forum Polaris How To & FAQs
    Replies: 25
    Last Post: 01-21-2017, 04:14 PM
  2. My 2003 msx 140 runs good under power but dies at idle
    By Adco1110 in forum Polaris Open Discussion
    Replies: 8
    Last Post: 08-15-2016, 07:20 PM
  3. MSX 140 Runs Rough at low-mid RPM range
    By Makon in forum MSX/Matrix
    Replies: 4
    Last Post: 08-04-2014, 08:27 PM
  4. Msx 140 nearly sank while out on the water
    By Makon in forum MSX/Matrix
    Replies: 18
    Last Post: 07-07-2014, 09:47 AM
  5. Replies: 0
    Last Post: 08-10-2011, 08:43 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
  •