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Old 14 April 2018, 07:53   #1
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Need help pls..

Hi, i have mercury optimax 90 hp. year 2011. the engine will not go over 3000 rpm , then it stalls. i have changed all fuel lines, all fuel injectors, all air injectors, fuel rail , and fuel pumps, and spark plugs. and it is still the same ? the dealer in my country cant say anything, only suggesting some wery expensive things, already spent over 3000 usd for parts,, any suggestions here .? someone had same issue ?
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Old 15 April 2018, 01:02   #2
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Is the engine alarm sounding ?
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Old 15 April 2018, 06:36   #3
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Wow that would of been expensive to swap all those parts over ! Have you hooked the engine up to a digital diagnostic terminal? To read any faults. If your doing this yourself have you got a workshop manual
Good luck
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Old 15 April 2018, 09:48   #4
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there is no alarm sound.... and already hooked the engine up with mercury digital diagnostic terminal... no faults... i cant figure out.. the dealer here is terrible and no service... well hope someone comes up with something to try,,��
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Old 15 April 2018, 10:01   #5
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Assuming its an inboard tank have you tried using a 25l external tank?
I know it may sound obvious but often simple things can be overlooked and you need to go back to basics
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Old 15 April 2018, 15:36   #6
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its a built in tank 100 l. but i use 25 liter tank...its strange it runs perfectly up to 3000 rpm,,, then stalls.. i changed spark plugs, and they are ok. but could it by Coil when the motor reaches 3000 rpm it does not work?
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Old 15 April 2018, 15:49   #7
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Does it restart easily after it stops or do you need to wait a while or crank it over for a long period does it help if you prime it after it stops
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Old 16 April 2018, 04:15   #8
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it does not stop, only stall ađ 3000 rpm... i was reading about fuel throttle sensors, is that something you know about..?
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Old 16 April 2018, 05:23   #9
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Lots more information required realy has it ever revved past 3000rpm have you had diagnostic plugged in whilst fault occurs have you checked basics like compressions? Temperatures etc?
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