Page 1 of 2 1 2 LastLast
Results 1 to 10 of 16
  1. #1

    2007 Challenger 180 Engine RPM Fluctuations

    Help please! With no change to the throttle position, Rotax engine RPM speed fluctuates on its own. For example, at one throttle position, speed can vary from 400 RPM up to 5500 RPM on its own! WHY??? Could it be bad fuel? Spark plugs? Fuel injector?

    Has anyone else encountered this problem? Thanks very much in advance ....


  2. #2
    I don't mean to scare you but I had similar symptoms before they eventually degraded into a check engine light and the shop is saying either a head rebuild or replacement.

    The early signs were fluctuations at mid to high rpms. Leaving the throttle at about mid, it would run at about 6,000 then drop out for a second to 5500 or so then back up to 6000. Eventually that lead to more severe swings especially when accelerating. Eventually it was rough even at idle and the check engine light came on.

    The shop says I'm only blowing 80 or so psi in one cylinder and will likely need a new/rebuilt head if not a complete new engine.

    It sounds like plugs are often the culprit and it was the first thing we tried so it's worth the $20 to try it and I certainly hope your luck is better than mine 'cause I'm looking at 50% of what I paid for the boat if we have to put a new engine in it.

  3. #3
    k-dub's Avatar
    Join Date
    Jul 2008
    Location
    Lindenwold, NJ
    Posts
    52
    I had the same happen while the Throttle Position Sensor was on it's way out. When the sensor finally kicked the bucket it threw a code and actually the boat ran fine. But just prior to it's failure the RPM's fluctuated on their own like someone was stabbing the throttle.

  4. #4
    GGG's Avatar
    Join Date
    Sep 2009
    Location
    Jersey Shore
    Posts
    2,830
    +1
    258
    disconnect the TPS and see if it fixes the problem

  5. #5
    Banned User
    Join Date
    Jun 2013
    Posts
    191
    +1
    2
    tps sensor make that problem

  6. #6
    Quote Originally Posted by GGG View Post
    disconnect the TPS and see if it fixes the problem
    Where is TPS located? Engine has gotten progressively worse - top RPM is 5500, top speed 20 mph. Even more alarming, engine seems to be vibrating excessively.

    Has anyone experienced these problems?

  7. #7
    Quote Originally Posted by ngfamily View Post
    Quote Originally Posted by GGG View Post
    disconnect the TPS and see if it fixes the problem
    Where is TPS located? Engine has gotten progressively worse - top RPM is 5500, top speed 20 mph. Even more alarming, engine seems to be vibrating excessively.

    Has anyone experienced these problems?
    Hate to say it but your progressing exactly like I did. Compression test should tell you if it's a similar engine problem (or give you the confidence that it's not).

  8. #8
    Just fantastic - such a large problem with only 15 hours on the meter.

  9. #9

    Join Date
    Jul 2011
    Location
    Ct
    Posts
    158
    +1
    3
    Just calm down and check the easy things first I'm sure you will find out its something simple compared to a rebuild. Change plugs and check the tps sensor first.

  10. #10
    Where is the TPS?

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. Challenger 180 max RPM
    By ddaoust in forum Sea Doo Sport Boats
    Replies: 4
    Last Post: 09-07-2016, 11:26 AM
  2. 2007 challenger 180 winterize
    By thundercatd in forum Sea Doo Sport Boats
    Replies: 6
    Last Post: 11-16-2013, 04:03 PM
  3. Oh oh. 2007 Challenger 180 -215 HP SCIC
    By ngfamily in forum 4-Tec Performance
    Replies: 10
    Last Post: 08-01-2012, 05:10 PM
  4. 2007 Challenger 180 Problem - Limp Mode
    By cmspeer in forum Sea Doo Sport Boats
    Replies: 5
    Last Post: 08-22-2008, 12:28 PM
  5. Challenger 180 High RPM problem
    By FLSUN in forum Sea Doo Sport Boats
    Replies: 17
    Last Post: 08-13-2008, 10:45 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
  •