Need help pls..

[lundi]

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 ?

[Bigo]

Is the engine alarm sounding ?

[whiskylee]

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

[lundi]

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,,��

[beamishken]

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

[lundi]

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?

[beamishken]

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

[lundi]

it does not stop, only stall að 3000 rpm... i was reading about fuel throttle sensors, is that something you know about..?

[beamishken]

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?