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Old 08-06-2014, 07:17 PM   #1
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Monaco with MaxForce engine

I own a 2013 Knight with a MaxForce engine. Has anyone else had exhaust problems? After purchase, mine spent 2months in the shop.
Now I'm having transmission problems. The xtrans does not down shift properly. The coach starts jerking until enough speed is maintained. I'm told a new download is needed. That was eight months ago.
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Old 08-06-2014, 08:05 PM   #2
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I have a 2012 knight 40DFT with the Maxxforce and have not had any exhaust issues. These engines have been criticized by many but I have been pleased with no problems with the engine after about 15000 miles. I can tell you that these engines need to be run hard and not "babied". They also do not like extended idle periods and recommend shutting down after short turbo cool down period. There is a computer update that addresses the exhaust system. I had no problems before or after the update with the system.
I had a similar transmission problem with jerky downshift at slow speeds when new particularly around 40 mph downshifting to 4th gear with a loud "clunk". I contacted Allison who recommended resetting the ECM for the transmission and then driving it through the gears using maximum acceleration shifts so that the computer would "relearn" the program. I can not remember the exact procedure to reset the transmission computer but believe it is stated in the Allison manual that came with the coach. It seems that the transmission has become smoother over time and now do not notice any issues when downshifting. For a short time when new and I had the slow speed shift issue, was able to get around the problem at slow speeds by manually keeping the transmission in a lower gear. Hope this helps and feel free to message further if I can help.
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Old 08-07-2014, 04:53 AM   #3
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Thank you. Sounds like the reboot should do the job.
Thanks again,

Bob & Susan
2013 Monaco Knight PDQ
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Old 08-07-2014, 09:36 AM   #4
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MavvForce

Previously posted, but offers some insight on your problem





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Rambler 419 dp rally at Elkhart
Just returned from this years Rally at Elkhart IN. Great time. Took a tour of the HR plant in Decatur. Had the Allison computer update software installed. Had the MAXXFORCE computer update as of Revision DTD 2 May 14. The engine revision was also for the regenerating component. Have previously had some "white smoke", but now none in 1600 miles. Had the tranny "latch code 6" installed, which holds back the RV when cruise is set and going down hill. Keeps the speed at 5 MPH over setting on cruise. Not sure which update, but there had been some "chugging" between 3/4 and 4/5. Lippert is also sending a new step module to correct intermittent problem. There were also some of HR "Sister ships" there. Possibly will be there again next year. Posted this 'cause I'masooohappy about attending the rally.
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Old 08-07-2014, 09:53 PM   #5
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My 2012 Knight had the jerking issue the day it was new. I have the ECM update done in last 2012 and that repaired the problem. This year I got another ECM update that was for the emission system (DPF). In over 17000 miles I haven't had any issues with the DPF, never had to do a regen.
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Old 08-08-2014, 08:20 PM   #6
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Welcome Knight 13 Knight12 here : Your problems are common and not a big deal there are recalls for both of these . Go back to your dealer service manager and have him look them up ,if he will not or is no help go to the closes international repair center and ask them . You can also give a call to your regional sales rep. and tell him what your coach is doing and ask him about the recalls ,also ask him how Monaco is going to cover the expense of getting it fixed . Hope this helps .The engine really is a great motor, Enjoy

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