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Old 05-22-2014, 10:02 PM
ELB ELB is offline
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Join Date: May 2014
Boat: 2006 MC X-30
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X-30 won't restart after engine is warm..

Please help. 2006 x-30 MCX (excelent condition and low time) will not restart after being shut off once the engine warms up. It turns over and kinda wants to start but will not fire up. Occasionally if I pump the throttle it will start and once it's started it runs great until its shut off again. I thought it was the fuel pump but after I put on a new MC module today (ouch) the same problem occurred. Fuel seems to be getting to the throttle body because I can smell fuel after turning it over several times. If I let it sit for an hour if fires right up. Ignition? Sencor? Any ideas? Thanks for your help in advance.
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Old 05-22-2014, 10:19 PM
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blackhawk blackhawk is offline
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What is the condition of your plugs, wires, distributor cap, and rotor? Try the simple things first. Also check for vacuum leaks around the intake and valve covers. Check the PCV valve and the hose that runs to it.
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Old 05-22-2014, 10:20 PM
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Vapor lock?
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  #4  
Old 05-23-2014, 12:41 AM
skitilldark skitilldark is offline
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My boat did this (the LTR-earier version of the MCX)—acted just like vapor lock, but being port injected, I couldn't figure out how/why. Believe it or not it was the thermostat. I had a 140 from the factory that was causing a rich issue. Once I switched to a 160, no issues.
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Old 05-23-2014, 03:35 AM
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CantRepeat CantRepeat is offline
 
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Possibly ECT going bad.

https://www.youtube.com/watch?v=wFHWpgHMAvY

https://www.youtube.com/watch?v=i2Kd0VQWw1o
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Old 05-23-2014, 07:37 AM
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FourFourty FourFourty is offline
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^ that is what I was thinking as well. That, or the intake air temp sensor.
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  #7  
Old 05-23-2014, 10:47 AM
TeamAllen TeamAllen is offline
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Boat: Tigé, 2150, 1997, Merc EFI
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Does it have a schrader valve on the fuel rail? if so, check the fuel pressure using a fuel pressure gauge when this occurs.
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Old 05-23-2014, 11:58 AM
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CantRepeat CantRepeat is offline
 
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Quote:
Originally Posted by TeamAllen View Post
Does it have a schrader valve on the fuel rail? if so, check the fuel pressure using a fuel pressure gauge when this occurs.
All the MC MCXs have a schrader valve on the fuel rail.
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Old 05-23-2014, 05:44 PM
TeamAllen TeamAllen is offline
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Great! If it's vapor lock, it's my understanding when you you are experiencing the non start issue, you can depress the valve and air(vapor) will come out. Use caution since the engine is at temperature and fuel might/will come out. A pressure gauge is still the correct way to check.
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Old 05-23-2014, 07:59 PM
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Quote:
Originally Posted by skitilldark View Post
My boat did this (the LTR-earier version of the MCX)—acted just like vapor lock, but being port injected, I couldn't figure out how/why. Believe it or not it was the thermostat. I had a 140 from the factory that was causing a rich issue. Once I switched to a 160, no issues.
My LTR did same and this fixed my hot start issue as well.
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coolant sensor, hot start issue, ignition, mcx, relay, sensor, x-30

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