Ox66 sx225 RPM issues

[dbarker]

Having issues with losing RPMs after reaching wide-open throttle. Just perform maintenance on the engine replacing all three low-pressure fuel pumps VST filter water separator filter and fuel filter on the engine. Also replaced O2 sensor. Motors a 2000 SX 225 with about 800 hours.

Just came back from a test run monitoring the fuel pressure at the VST tank it held pressure flawlessly at 38 pounds.

My problem? After reaching wide open throttle which is about 5100 RPMs. The motor seems to slow down and RPMs about three or 400.

If I pulled the throttle lever back a little and then give it full throttle again it'll pick back up to 5100 RPMs but then mediately start slowing down three 400 rpm's.

Any suggestions on what to check next. Is it possible throttle positioning sensor is sending bad information back to the ECu?

 

[N1NE1]

is the oil tank on side of the motor keeping up and staying full? For some reason a lot of oil filters are being clogging up this year

 

[Tidal Chaos]

I would look at the small screen on top of the fuel rail and the screens in your fuel injectors; I just had this happen 3 months ago and once I pulled the fuel rail and looked at the injector baskets and the small filter on top I knew it was the problem as they were all plugged with crud and restricting the fuel flow. sent my injectors out for a cleaning and all was good; no more slight drop and the rpms held constant on the motor.

 

[dbarker]

I've already replaced the oil tank filter. Only have about 10 hours on this new O2 sensor I'm cleaning it tonight I will run the checks tomorrow with the proper wiring harness and then I'll move on to the fuel injector Filters if needed. thanks for all the help