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Old 07-02-2018, 12:02 PM
Skunkworks Skunkworks is offline
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Join Date: Dec 2014
Boat: Mastercraft X45 2005 LQ9
Location: Southeast
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LQ9 Limp home

After cruising around and enjoying the 2005 X45 w/ LQ9 for a couple hours yesterday, we were on our way home. All was fine... running around 3,000 rpms, oil pressure, water temp, volts, everything was great. Then the engine just went to idle and the alarm sounded. No more throttle response. I turned the engine off, restarted and we got to about 2,500 rpm for about a minute and then we went back to idle again. For fear something would be damaged, we simply idled home (took about an hour).

Been through a lot of the threads on limp home but most seem to be about throttle limited to 3,000 rpms. My boat just went back to idle. Any help is greatly appreciated. I'd love to go out on the 4th.

David
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  #2  
Old 07-03-2018, 12:59 AM
03 35th Anniversary's Avatar
03 35th Anniversary 03 35th Anniversary is offline
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I wish I had a good answer for you, but when my 03 197 w/LQ9 would hit limp mode it would do the same as yours and only idle.
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Old 07-03-2018, 10:15 AM
Skunkworks Skunkworks is offline
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Boat: Mastercraft X45 2005 LQ9
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What did you have corrected so that it stopped going into limp mode (idle)? Thanks.
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Old 07-03-2018, 10:46 PM
03 35th Anniversary's Avatar
03 35th Anniversary 03 35th Anniversary is offline
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Quote:
Originally Posted by Skunkworks View Post
What did you have corrected so that it stopped going into limp mode (idle)? Thanks.
Let it cool off and it reset itself.
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  #5  
Old 07-09-2018, 05:52 PM
Skunkworks Skunkworks is offline
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Boat: Mastercraft X45 2005 LQ9
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I was able to duplicate the problem and it appears that the temp had gone up to about 180 degrees and then went into Limp Home. After running at lower RPM's the temp came down to 160 and I was good to go until it climbed again. Any recommendations on what to check next?
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Old 07-09-2018, 06:01 PM
Skunkworks Skunkworks is offline
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Join Date: Dec 2014
Boat: Mastercraft X45 2005 LQ9
Location: Southeast
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I was able to duplicate the problem and it appears that the temp had gone up to about 180 degrees and then went into Limp Home. After running at lower RPM's the temp came down to 160 and I was good to go until it climbed again. Any recommendations on what to check next?
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  #7  
Old 07-09-2018, 09:12 PM
Krw1225 Krw1225 is offline
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Boat: 2008 X-14, 40th Anniversary Edition, MCX w/ Powerslot
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You could have your local dealer or mechanic read the code, if it’s getting hot, might not be getting enough water. Replaced impeller? Water pump?
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  #8  
Old 07-09-2018, 10:57 PM
creekrat creekrat is offline
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Donít call me out if Iím wrong but I believe there was an issue with the upper temp limit when water would sit in the motor especially after shutting it down that caused them to go into limp mode. If itís the issue Iím thinking of then the end needs a reflashfor the higher setting. In all honesty, 180F on a lq9 is nothing.
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Old 07-11-2018, 05:03 PM
Skunkworks Skunkworks is offline
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Join Date: Dec 2014
Boat: Mastercraft X45 2005 LQ9
Location: Southeast
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I will be replacing the impeller this weekend and checking the inlet to the transmission cooler for debris. Also, will try the "burping" technique mentioned on the forum as well. Another consideration will be replacement of the thermostat.

I agree that 180F should not cause limp-home, but that's all I have for now. After these inexpensive efforts, it will be off to the dealer.
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