Another ox-66 question

[New2me]

My brother inlaw has 97 3.1L 0X66 not sure model right now,I need a little help in the direction to go trouble shooting,The motor would surge and shut down at about 4800 rpms,Played around with the grounds fixing other stuff took the boat out and didnt do it at all,3 months later (today) he called me and said it was not running good at all, he changed racor filter and ran good up to guessing about 3800 rpms about 38mph His tach guage is shot.Should I go back to the ground like before or look at the fuel system.I know the pumps need to be changed as they are at least 6years old.Also the motor will surge in the mid range but if you give it a little more throttle will smooth out.I am waitng for a repair manuel to come in for this motor so where should I start looking for problems I need a list if i can get one. sorry for the long post

 

[cousinabe]

Re: Another ox-66 question

sounds like a faulty lp pump and/or clogged vst filter.

If the motor is new to him and not really sure of the maint history, i would look into:
1) replace low pressure fuel pumps
2) replace/clean VST screen and o-ring.
3) clean pressure regulator screen on VST.
4) clean fuel injector screens
5) clean/test O2 sensor for proper output voltage.
6) replace water pump
7) replace engine filter and water separator filter.
8) inspect/clean out popit valve; PRV.
9) link and synch and set TPS.
10) replace thermostats.
11) check that resistance of spark plug caps are in spec.
12) properly adjust the oil linkage rod.
13) clean filter on remote oil tank.

 

[New2me]

Re: Another ox-66 question

Thats what I was lookin for thanks.