Page 1 of 2 1 2 LastLast
Results 1 to 10 of 11
  1. #1

    Unhappy 96 SLX 780 - Has me stumped

    First post here, glad to see some people know what they are doing!

    Anyways, I will cut right to the chase.

    1996 SLX 780. Cylinders were not siezed but scuffed, pistons as well. Honed, replaced all 3 pistons with some nice new Wiseco's. Replaced CDI and Temp Sensor. Engine is STILL in limp mode, but the fuel level reads full. Red light blinks on dash.

    If I pull grey wire from CDI (where it plugs into the board) it will rev up to ~6000rpms. Without that disconected I cant seem to get it to get past ~4500.

    I have searched on here and tried a few things, but nothing seems to work. Now I come to you for advice! Thank you much!
    -J

    EDIT: is it safe to run without grey wire hooked up? should i ground it? also what is normal temp on the cylinder heads, i have a laser temp gun i can test it with. thanks!


  2. #2
    RizzO
    Join Date
    Aug 2008
    Location
    Milwaukee, Wisconsin
    Posts
    300
    +1
    1
    I have A 2000 Pro1200 and I had A problem with it staying in the limp mode, and everything was fine. I found out it was the MFD, so I replaced the MFD and the problem went away.
    Does your MFD act wacky somtimes? My bad MFD would say low oil when the oil was full and it somtimes say hot when the motor was cold. Just thought I would put this out there since it sounds similar. But my motor was also fine, so be sure to double check everthing.

    RiZ
    PS-Welcome to the HULK!! This is the BEST place for PWC info.

  3. #3
    RizzO
    Join Date
    Aug 2008
    Location
    Milwaukee, Wisconsin
    Posts
    300
    +1
    1
    If you unplug the MFD will you get full rpm's?

  4. #4
    thanks rizzo, nice avatar by the way

    The machine is not mine, I am fixing it for a friend. The display does not seem to be running odd, but I have not put hours on it, only minutes here and there, so I can not be sure. I will try running it with it unplugged and see what happens, get back to you in 5min.

  5. #5
    Moderator beerdart's Avatar
    Join Date
    Aug 2006
    Location
    CT
    Posts
    25,929
    +1
    1,407
    Three thinks will trigger limp. Hot , Low Fuel and Low oil..

  6. #6
    Quote Originally Posted by beerdart View Post
    Three thinks will trigger limp. Hot , Low Fuel and Low oil..
    Temp sensor was replaced, and it limps right from cold start onward.

    Fuel tank is 3/4 full, and reading that way on the dash.

    Oil tank is full.



    This has me totally stumped. Anyone know if a reset procedure will remove the flashing light? Seems to run great with grey wire unhooked.

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    36,575
    +1
    1,272
    Oil tank reading on the display also says full?

    Any message on the display, like HOT?

    A wiring short will do it, in the Tan overheat or gray wires.

    Check the wiring diagram - does the gray wire connect to the LR module? That can do it too.

  8. #8
    Anyone have a gun, shoot me now...

    Ok, stupid me... when reading the dash, oil is FULL, fuel is EMPTY.

    I was so used to my Kawasaki watercraft only having fuel level on the RH side, I overlooked the tiny sun faded fuel/oil icons.

    Quick question: this means the fuel sensor in the tank is bad? Can I ground or jump the red/black wires coming from the tank and just have my friend keep an eye on his fuel level?

    Sorry for all the confusion, someone get me a BEER! (or 6)

  9. #9
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    36,575
    +1
    1,272
    Wire in a 33 ohm resistor between the fuel sender wires, either at the tank connector, or inside the electrical box.
    33 ohms = full tank reading.

    The fuel sender floats can fail. Randy at Watcon sells replacement floats.

  10. #10
    Thanks a bunch for all of the help guys, going to Radio Shack now.

    Also sorry for me overlooking the stupid fuel level, its been a long week and it's only Wed...

    beer-o-clock will come early tonight!

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. 96 slx 780 motor mount problem
    By wsony13 in forum Polaris Open Discussion
    Replies: 10
    Last Post: 07-11-2007, 01:14 AM
  2. 96 SLX 780 Fuel problems
    By mtiller in forum Polaris Open Discussion
    Replies: 5
    Last Post: 07-08-2007, 06:14 PM
  3. Does a 95 Sl750 have the same number of veins as a 96 slx 780?
    By gvnitup in forum Polaris How To & FAQs
    Replies: 4
    Last Post: 05-28-2007, 12:05 PM
  4. 96 Slx 780 Cdi??
    By Truckinevan2005 in forum Polaris Open Discussion
    Replies: 4
    Last Post: 05-13-2007, 10:18 PM
  5. 96 SLX 780 No Spark
    By Truckinevan2005 in forum Polaris Open Discussion
    Replies: 4
    Last Post: 04-30-2007, 10:02 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
  •