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Mercury 2003 hot start issue

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TimOare

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Hi All,

Hope you can help, fuel injected 2003 M2 240HP second generation on an Islandia.

I have read through the forum posts here, I see others have had this issue but I don’t see a resolution.

Starts great cold, run great through all ranges. Pulling a tube running her hard, shut down the motor after letting it idle a couple seconds and it does not start.
Stranded for a while - still no start. 30 min later starts right up like nothing was wrong? I was told maybe vapour lock - swapped out the gas with definitely no ethanol in it- same issue. Port, Star board and intake temperature sensor all brand new. I have mercury vessel view installed - no errors codes are thrown.

After getting frustrated, opened up the butterfly valve while my buddy cranked the motor over- not even half a second and it fired right up?

Do I need to adjust the throttle body butterfly valve?

Really appreciate any help. Thanks!
 
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