2015 RXT-X 260 AS! I need help guys!

[Spenc]

Hey guys, I'm in need of some help here!

I recently bought a 2015 Rxt-x 260 AS the guy I bought it from said he has no clue what is wrong with it but it was running rough.
I found water in the oil and found out it was coming from the intercooler. I replaced the intercooler and the throttle body and changed the oil and oil filter and also changed out the plugs.
I thought to myself there's no way it could of been this easy for the deal I got.

took the ski out for the first time, started up good, no rough idle.
When you give the ski throttle its very sluggish sometimes it will get up to 20-30 mph at 5k rpm but if u hold the throttle all the way down roughly 10-30 seconds you can feel something kick and still hesitates but then boost up to 50-60 mph. it does that everytime you slow down and give it throttle again. Also when you are going 30 mph and make a sharp turn it bogs down.

Sometimes it doesn't kick in and runs 30 mph at full throttle. but when it does kick in the top rpms is 7400-7600 RPM at 62 MPH.

the ski is throwing no check engine or codes.

ANY HELP WOULD BE APPRECIATED!!

Thank you!
Spencer

[mogman8]

Spencer, did you ever find a resolution to this? I'm having the same problem with my RXTX 260

[DinoMite]

Spencer, did you ever find a resolution to this? I'm having the same problem with my RXTX 260

If you replaced the throttle body, you'll want to re zero it.

Get you a can doo they are fantastic for trouble shooting.

Limited Sea Doo and Can Am ATV Home System (2 stroke 4 stroke) [1000] : PWC Performance Parts (4-tecperformance.com)

Also Id say on a lot of these older skis you could be running into issues with the inline fuel filters getting clogged up. They are in the top of the fuel sending unit. Kind of pain in the ass to inspect but you can unsnap the housing and look at it. If a ski has had high quality gas in it's whole life its probably fine but if you run lots I'll say marginal gas, marina gas they can get pretty nasty over time. I have one 10 years old and it looks great but I only run shell 93, I've seen a friends that was only a few years old that ran lots of marina gas it didn't look great. You can't replace them but you run an external automotive one if you need to. Just make sure it's for fuel injector cars so it handle the pressure.

Also might want to get your fuel injectors cleaned and verify the fuel pump pressure. Make sure the base fuel system is good to go and then trouble shoot from there. The candoo will tell you if it's a sensor of some sort and allow recalibration of the throttle.

[mogman8]

Hi DinoMite. I haven't replaced the throttle body and that appears to be working

I have been mulling over buying a candoo but wasn't sure if it'd be able to help me if I didn't have any fault codes in the system....would you say it will be helpful in diagnosing this sort of mystery issue?

RE the fuel filter, given this will run 67MPH and is responsive at the top end of the throttle, I don't suspect fuel flow issues because I only need more flow at the higher speeds which oddly seems to be fine. Regardless, you were saying 'unsnap the housing?'....I assume this first requires unscrewing the port on the top of the tank to remove the sending unit, correct? I'm going to start a separate thread detailing everything better

If you replaced the throttle body, you'll want to re zero it.

Get you a can doo they are fantastic for trouble shooting.

Limited Sea Doo and Can Am ATV Home System (2 stroke 4 stroke) [1000] : PWC Performance Parts (4-tecperformance.com)

Also Id say on a lot of these older skis you could be running into issues with the inline fuel filters getting clogged up. They are in the top of the fuel sending unit. Kind of pain in the ass to inspect but you can unsnap the housing and look at it. If a ski has had high quality gas in it's whole life its probably fine but if you run lots I'll say marginal gas, marina gas they can get pretty nasty over time. I have one 10 years old and it looks great but I only run shell 93, I've seen a friends that was only a few years old that ran lots of marina gas it didn't look great. You can't replace them but you run an external automotive one if you need to. Just make sure it's for fuel injector cars so it handle the pressure.

Also might want to get your fuel injectors cleaned and verify the fuel pump pressure. Make sure the base fuel system is good to go and then trouble shoot from there. The candoo will tell you if it's a sensor of some sort and allow recalibration of the throttle.

[nmpeter]

I concur with Dinomite

fuel pump sock has disintegrated and the fuel pressure regulator is sticking

typical response from people that don't know anything(the skis previous owner) is to dumpgum out or similar snake oil into the fuel tank and that finished off the pump sock

low fuel pressure does not throw codes.

get a pressure gauge on it and report back with the pressure at idle and at 6k rpms

if the fuel pressure is within spec, you should pull the fuel rail, bag the injectors and observe the spray patterns when cranking the engine

the candoo is a pretty handy tool that literally pays for itself the first time you use it.

removing the fuel pump is not an easy job, there are lots of small bolts, a finicky rubber gasket ( have a spare as I expect the snake oil has made it impossible to reuse)

but don't remove it until you confirm there is actually an issue with fuel supply.

and without an analyzer you cannot really tell if the throttle body is actually operating correctly

[mogman8]

Hi nmpeter, thank you for the ideas. About the fuel system, the ski was almost new when I got it used from a guy who bought it from our local dealer and sold it because he didn't really ride it, I think it had about 35 hours if I recall when I got it and was under warranty....can't see any reason someone would have put anything other than gas or stabil in the tank. I have owned it since, always put 93 in it from road gas stations and stabil over the winter, never had any issues with it prior to doing the SC rebuild and drive line last winter. If low fuel pressure was an issue, wouldn't I have trouble on the top end when more fuel is called for? I don't see any schrader valves etc on the fuel rail like on some cars so how do people measure the fuel pressure on these? Can candoo do that? I did have all the injectors out and observed their spray patterns earlier which led me to find a leaky injector which I replaced but the others at that time seemed okay to me. Each time I popped the line off the rail or an injector there was a good release of pressure though (makes a mess) I didn't have a way to measure it with a gauge. I didn't have the throttle body on an analyzer but had my finger in there in drown mode and could feel it responding to my input on the throttle trigger. I know that's not a scientific test though. Knowing the history of this ski since very early on and what I knew about the previous owner, I'd bet my life there was nothing in the tank other than gas and stabil. And just to mention, the ski has been run every year, never sat and never caused me any trouble till I had the leaking pto bearing which resulted in a driveline rebuild and figured I'd do the SC since I had it out at 125 hours.

I concur with Dinomite

fuel pump sock has disintegrated and the fuel pressure regulator is sticking

typical response from people that don't know anything(the skis previous owner) is to dumpgum out or similar snake oil into the fuel tank and that finished off the pump sock

low fuel pressure does not throw codes.

get a pressure gauge on it and report back with the pressure at idle and at 6k rpms

if the fuel pressure is within spec, you should pull the fuel rail, bag the injectors and observe the spray patterns when cranking the engine

the candoo is a pretty handy tool that literally pays for itself the first time you use it.

removing the fuel pump is not an easy job, there are lots of small bolts, a finicky rubber gasket ( have a spare as I expect the snake oil has made it impossible to reuse)

but don't remove it until you confirm there is actually an issue with fuel supply.

and without an analyzer you cannot really tell if the throttle body is actually operating correctly

[DinoMite]

I get the candoo and report back. You can see some history and errors you might not see on the dash. Also you can actuate everything. It really is worth the price.

I think I still have a cover from my 2014 TX as and also this little plastic side bin riva used to make...pm me if your interested.

Is the wear ring/impeller in very good condition? What's the compression? I'd have the injectors professionally cleaned/flowed...it's not very expensive. RC-Engineering is who I use.

[mogman8]

SOLUTION: for mine, it ended up being a bad head gasket.....I'm assuming this may have resulted from a leaky injector that caused a backfire while running it on the hose at one point. Regarding the candoo....I spoke with those guys and they told me it was unlikely it would be able to diagnose the issue I was having and now knowing what it was, I agree.