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  #11  
Old 07-31-2012, 01:00 PM
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CantRepeat CantRepeat is online now
 
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So it's normal for an LY6 but surely not normal based on throttle by wire.
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  #12  
Old 07-31-2012, 01:03 PM
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scott023 scott023 is offline
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Quote:
Originally Posted by CantRepeat View Post
So it's normal for an LY6 but surely not normal based on throttle by wire.
That's right. Dealer said the MCX and L18 don't have that characteristic.
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  #13  
Old 07-31-2012, 06:10 PM
sraab928 sraab928 is offline
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Boat: Mastercraft CSX220SS 2008 400HP CY6
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So I guess wrong explanation from the purchasing dealer but still the engine behavior is ok - Its good to know if anyone else is looking at one of these.
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  #14  
Old 05-01-2014, 06:57 AM
Coolerking Coolerking is offline
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Boat: Mastercraft x-star, 2008, LY6
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Indmar LY6 Starting issues

Hi

I bought a 2008 XStar with only 150 hrs on it a couple of years ago. It has the LY6 Indmar 6ltr engine in it (Saltwater Series) and like you guys it hunted quite badly at cold startup (for around 20-30 seconds). Again, I was told that they all do it and not to be concerned.

Over the last 12 months the engine has progressively hunted more to the point that it stalled after a few hunts (5-10 seconds) meaning that I needed to provide additional revs to get the boat to run past the first 20-30 seconds. Once past the first 30 seconds the boat was fine all day.

I changed my maintainer to Maiden Marine in Crewe this year, and his (Mike) first comment was that as an Indmar specialist he didnít understand why it would hunt and had other customers with the same engine that didnít hunt, so it looked more like a common fault rather than a Ďfeatureí.

The first thing Mike diagnosed was that the fuel pump was failing. At first it was assumed that the previous owner ran the fuel tank dry at some stage but putting the engine back together (post service etc.) it started stalling again leading Mike to have concerns that the bleeding away of pressure was causing undue stress on the fuel pump and that the new one may fail soon.

The big question is, what is causing the pressure to bleed away that stops when the engine starts to warm and is about the engine being in a boat and not a truck?....

After many hours tinkering with components, fuel maps etc. Mike has diagnoses the O ring seals around the injectors. Because the routes/angles of the fuel lines into the engine are at strange and differing angles, it seems to be quite easy to get a seal that is bleeding fuel pressure. It would also seem that as the engine starts to warm that the expansion of the cylinder head makes the seal better.

Iím no mechanic and Iím sure Mike did a load of other things to the engine but a couple of things seem clear: 1) the wild hunting is not normal and 2) there is a common problem with the way the Indmar engines are installed into Mastrecraft boats.

If anybody out there has anything further to add please do as there maybe more contributory factors to the common fault on these engines.

I have yet to use the boat in anger this season. If anything further comes back I will post a message.
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  #15  
Old 05-01-2014, 11:51 AM
JamesL JamesL is offline
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Boat: mastercraft X45 2008 LY6
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When I purchased my 08 with the LY6 I was told that it was perfectly normal for them to rev up and down like that for the first few seconds. I was told this by Eric from the boathouse in Chicago
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  #16  
Old 05-01-2014, 12:20 PM
willg willg is offline
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I had a problem similar to this, it was the idle air control valve. Granted I have a much older LTR, but maybe something to check

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  #17  
Old 05-01-2014, 01:10 PM
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Forrest-X45 Forrest-X45 is offline
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Coolerking - Sorry but I disagree with your two points. What you describe behavior wise is normal behavior for a LY6. Mine does the same thing and has for years. As others have posted it is normal and my Dealer mechanics say they all do specially here on cool NW mornings. It is the cool morning air because mine won't do it later in the day on a first start if it is warmer out. It sounds like a drag engine idling with a huge amount of valve lift and squared off cam lobes. Gets everyone's' attention at the boat launch. Your second point is beyond believable. There are thousands upon thousands of MC's running Indmar engines without issues so having an install issue is crazy.

When the engine died after 15 seconds was this a one time occurrence or does it happen every cold startup? If it is one time caulk it up as that, one time. If the engine dies after 15 seconds every start then there is another issue. Throttle position sensor or MAF sensor???
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  #18  
Old 05-01-2014, 05:31 PM
Coolerking Coolerking is offline
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Boat: Mastercraft x-star, 2008, LY6
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Thanks Willg / Forrest, just the responses I was hoping for. In reality I've no idea what the problem is, just repeating what the specialist is telling me, so anything you can add to shed some light on the problem is much appreciated.

Forrest, it did it every time once it started doing it. Yes agree re. the indmar's on MCs as the mechanic knows of indmars in MCs and non MC that work fine but he is saying the injector seal is prone to failure due to setup. Could this be a problem or unlikely?

I haven't tested it yet since the guy servicing it has fixed it. Will let you know how I go on but meanwhile I'm going to record your comments and pass them to the guy sorting it out. Many thanks.
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  #19  
Old 05-01-2014, 06:45 PM
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1redTA 1redTA is offline
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sounds like a dirty IAC valve
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  #20  
Old 05-01-2014, 06:47 PM
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1redTA 1redTA is offline
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dirty iphone
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