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Old     (rs1071)      Join Date: Feb 2007       05-10-2009, 5:13 PM Reply   
So I hope I can dig up some ideas from my fellow wakeworlders.

Monday May 4: Summerized my 2007 MC X-1 like I usually do: replaced impeller, checked fluids (changed in October), replaced plugs, hooked up external water supply, etc... Engine ran great with no warnings, buzzers, or BS. I warmed it up and it was on for about 5 minutes. Nothing out of the ordinary happened at all.

Tuesday - Thursday: Spent the week installing a new ballast system in the rear with new fly high bags and new plumbing. I modified the wiring for the stock pumps to completely bypass the timers for the two rear pumps. The KGB pump is still hooked in to the timers.

Friday May 8: Launched the boat and immediately after start up got a loud buzzer with a check engine warning on the speedometer. Messed with the boat a bit more and nothing seemed to be wrong: the engine was running just fine, it had excellent oil pressure, it didn't overheat, the tranny shifted and felt great, no circuit breakers were popped, and there was no vibration or strange noises. I am very familiar with the 5.7L and engines in general but I could not narrow down any sort of probable cause as to why the check engine warning was flashing. Since the boat was run on Monday and the only thing I did since then was install the new ballast system I am wondering if bypassing and cutting the power/ground to the timers would register in the computer. I can't imagine it would. I also could have bumped a sensor or wire when working on the ballast but think that is rather unlikely. Oh and I just remembered I pulled the starter to grease it, but that shouldn't do anything.

Anyone have any ideas? I don't want to take it in to the dealer and pay to run the diagnostics on it to tell me something dumb.

On a side note I want to thank those of you that have posted up information on do it yourself projects; that info was really helpful when designing a new ballast system while 400+ miles away from my boat. Thanks!
Old     (snowboardcorey)      Join Date: Jan 2004       05-11-2009, 5:05 AM Reply   
My guess is a bad knock sensor or a poor knock sensor connection.
Old     (tgoin)      Join Date: Apr 2009       05-11-2009, 5:19 AM Reply   
That's an Indmar, right? I know there were a
TON of problems with an exhaust heat sensor
(especially on the engines with the Catalytic

These would throw codes all the time. After
replacing sensors like crazy, the new program
that was downloaded just ignores codes from
that sensor.

Good luck
Old     (ian_ashton)      Join Date: Jul 2008       05-11-2009, 7:25 AM Reply   
OT: What lake is the picture in your profile from? Thats absolutely awesome looking!
Old     (rs1071)      Join Date: Feb 2007       05-11-2009, 2:10 PM Reply   
That would be the great Lake Superior.


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