7.4 lx efi falls on its face and hesitates
 

I've got a 7.4 lx efi the motor is tbi injected the problem I'm having with it is it falls on its fact on the top end. I have replaced cap, rotor, plugs, wires, checked fuel pressure 30psi under load, set timing at 8 degrees in base timing mode, replaced fuel water separator and still is doggy any thoughts?

I believe there is another filter by the throttle body also. Dump your separator in a coffee can (yes again) and see what you have.

No other fuel filters but I will drain the seporator and see what I get

Drained the seporator and hooked an aux tank up with fresh fuel no change

REv limiter ?

Is this a new boat or engine to you ?

Describe "falls on it's face "

Overpropped ?

No the boat is not over proped I'm running a 21p it will bog reving it in neutral

It will run fine till about 3/4 throttle anything after that it just bogs only get 4100 rpm on a good day the boat is a 22 scarab

Any trouble codes ?

What rpm did it run with the same prop when it ran well ?

It never ran right from day one bought it last year towards the end of the season so didn't use it much

Anyone with any thoughts???

YES engine year model and correct engine serial # are ????

0k151091 it's a 96 mercruiser 7.4 lx efi

7.4 lx mpi... I had a fall on face problem, drained and refilled tank, new fuel water filter/seperator, cleaned the filter in the vst, cap rotor etc. etc... still seemed to fall on face reving at the dock. finally hooked up a good timing light with tach to it.. the rev limiter iis so low on it it was hitting it.. took it out and it ran great. No idea what fixed it as I just kept fixing because it didnt 'feel' right... moral of the story, make sure you have a problem not a limitation....

Pretty much done all that mine does not have a vst tank on it