Go Back   TeamTalk > General MasterCraft Topics > General Discussion

Reply
 
Thread Tools Display Modes
  #1  
Old 05-24-2015, 06:29 PM
steveG steveG is offline
TT Newbie
 
Join Date: Dec 2014
Boat: 2015 X23 with 7.4
Location: Northeast
Posts: 15
X23 with Ilmor 7.4 Warm Start Problems

I have an X23 with the 7.4 with 12.5 hours.

From Hour 1, I have had an issue with the engine starting while it is warm. I was instructed by the dealer to take it out of gear and increase the throttle. That allowed me to limp home on my first run of the boat. The dealer contacted Ilmor and was told that it was a known issue (X23 with the 7.4) and is fine to run the boat until the upgrade was available. Ilmor provided a new calibration file and the dealer uploaded the new calibration file to the ECN on Thursday. It seemed to fix the problem and engine seemed to be running smoother.

Today, after a shutdown to switch surfers it refused to start again. I took out of gear and increased the throttle and I think it back fired through the flame arrestor.

I am remaining remarkably calm, but this is a real bummer. Is anyone else having issue with Ilmor 7.4 in the X23 ? At this point, I starting to think the problem is deeper than a software upgrade.

Other strange things I have experienced:

(1) Backing off the throttle slowly the engine almost stalls
(2) During one wake surf session the RPM was varying up and down more than I experienced before, kind like a surge

Any deep thoughts ?

Last edited by steveG; 05-24-2015 at 06:35 PM. Reason: Clarify posting
Reply With Quote
  #2  
Old 05-24-2015, 06:36 PM
mikeg205's Avatar
mikeg205 mikeg205 is online now
Moderator
 
Join Date: Aug 2011
Boat: 1995 Pro Star 205 5.7 Liter
Location: Plainfield - Joliet, IL
Posts: 14,962
Send a message via Skype™ to mikeg205
sorry to read this on such a new boat..
__________________
...A bad day water skiing still beats a good day at work...1995 Pro Star 205....
Reply With Quote
  #3  
Old 05-24-2015, 07:42 PM
snork snork is offline
MC Devotee
 
Join Date: Jul 2007
Boat: 07 xstar
Location: south
Posts: 2,476
air fuel mixture off, could be the electronic choke
Reply With Quote
  #4  
Old 05-24-2015, 08:23 PM
scott023's Avatar
scott023 scott023 is offline
MC Master Poster
 
Join Date: Sep 2008
Boat: 2008 X45 Switch L18
Location: Canada
Posts: 16,364
Doesn't seem like an issue you should ever have to experience. Sounds like the dealer should be more actively involved in finding the root cause of the problem.
Reply With Quote
  #5  
Old 05-24-2015, 08:26 PM
tkemperdc's Avatar
tkemperdc tkemperdc is offline
MC Devotee
 
Join Date: May 2012
Boat: 2013 X Star, cute pumpkin motor, 2008 XStar LY6 (gone), 2006 X-15 (gone)
Location: Fargo, ND
Posts: 1,061
Quote:
Originally Posted by scott023 View Post
Doesn't seem like an issue you should ever have to experience. Sounds like the dealer should be more actively involved in finding the root cause of the problem.
Agreed!! Esp. With the cost of a 7.4 upgrade
Reply With Quote
  #6  
Old 05-24-2015, 08:31 PM
Astepatatime Astepatatime is offline
TT Enthusiast
 
Join Date: Mar 2013
Boat: X55, 2013, 7.4L
Location: Texas
Posts: 258
Not an X23, but have a 7.4. During the first oh, 10 hours or so, ours was a bit finicky also. Kind of like it got flooded in an old school carburetor. Happened twice that I recall. It started after a few minutes (the first time on the delivery shakeout) and then never occurred again. Don't think it threw any warning codes.

So, yeah, that was no help I realize. My concern level was high at the time too...got empathy for you.
Reply With Quote
  #7  
Old 05-24-2015, 10:26 PM
FourFourty's Avatar
FourFourty FourFourty is offline
MC Devotee
 
Join Date: Nov 2010
Boat: 2016 Nautique G23
Location: Northeast
Posts: 1,746
All three of my 7.4s have been finicky rumbling critters through their break in period. (10 hours or so). After that all been fine. However, I have had them have an extended crank on restart, and have had to take out of gear and put in clear flood mode. That said, it was extremely infrequent...... Like maybe twice on each boat. So basically once every 60-70 hours or so. My X23 is at 15 hours, and failed one start, and had to put in clear flood.
Reply With Quote
  #8  
Old 05-24-2015, 10:27 PM
FourFourty's Avatar
FourFourty FourFourty is offline
MC Devotee
 
Join Date: Nov 2010
Boat: 2016 Nautique G23
Location: Northeast
Posts: 1,746
Quote:
Originally Posted by snork View Post
air fuel mixture off, could be the electronic choke
No choke on these new EFI motors......
Reply With Quote
  #9  
Old 05-24-2015, 10:34 PM
snork snork is offline
MC Devotee
 
Join Date: Jul 2007
Boat: 07 xstar
Location: south
Posts: 2,476
Quote:
Originally Posted by FourFourty View Post
No choke on these new EFI motors......
I'm quite aware just didn't know the correct word use, you?
throttle position sensor?
Reply With Quote
  #10  
Old 05-25-2015, 12:03 AM
mikeg205's Avatar
mikeg205 mikeg205 is online now
Moderator
 
Join Date: Aug 2011
Boat: 1995 Pro Star 205 5.7 Liter
Location: Plainfield - Joliet, IL
Posts: 14,962
Send a message via Skype™ to mikeg205
Not the TPS - timing screwed up for some reason in the ecu, something causing over lean condition or and firing when intake valve open... very strange - on such an advanced engine.
__________________
...A bad day water skiing still beats a good day at work...1995 Pro Star 205....
Reply With Quote
Reply

Tags
x23

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -4. The time now is 08:17 PM.