2004 MSX 150 does not want to run above 3450 RPM, except when it does

[brunoski]

not to walk on another man's post,,, BUT !!!
I have a 2004 MX150 here and does the same thing sorta, what's a SIBF??

If you don't mind Mike may I ask this.
Her's ran fine then her son rolled over at 5mph.. but rolled it upright in wrong direction,, SOOO he rolled it back over the correct way TWICE to make up for it?DUH? by then I suspect the bilge was full of water above the air intake and he started it ran it back to dock smoking badly. Engine oil was contaminated so I pulled and washed intake, oil separator, inner-cooler. It would only go 3500rpm. Sent computer to Canada to have it read and reprogrammed with different fuel curve and ???. Still 3450rpm. Sent it back this time with most of the sensors. He said some were bad and so he sold me new ones. He said he put all her parts in his personal ski and went almost 77mph.. I installed the new parts and still 3450rpm. She only putts around so she lived with it for a year. Last summer it began not starting when hot (not overly hot but just ran it change drivers and no start). If you pull the injector wires off and crank it a bit it will start run out of gas and die. Hook up injectors and she'll start up and run. Then it began where if you hit a bump (wave) just right it will take off like a rocket 70 mph-ish occasionally. Then it got where it would only go 30, then 20, then 15mph. Will die and not restart even with the injector trick... The boost gauge shows turbo boost when it's running and it sounds like it is dumping (waste gate) on the few times it takes off, (it seems to like to go fast at the wrong times so you have to let off abruptly and pop goes the gate). OH''She just told me the last couple of times she took it out the first time in the water (for that day) she would Always idle just at plane for 4 to 5 minutes to warm it up only on a couple of trips she would have to drive it for 10 to 20 minutes before it would run faster than 10 or 15 mph max. Once it would go it would go up to 45mph then slowly back down to a max of 3450rpm?

PS Should I start a new post. I'm not much of a forum person (newbie)

[ripcuda]

Hi Brunoski
The SIFB is a small square module with a connector to plug into the wire harness. It is located in the wire harness directly above the battery... probably ziptied in there. This SIFB is responsible for auto-power-down of the ignition system when the ski is off and the lanyard is left IN. It also translates the reverse engaged switch signal for the ECU. If your having any sort of 3400 rpm ECU rev-limit... the SIFB is the main suspect. If your having weird startup/shutdown issues... the SIFB is also a suspect.

Randy at WeberPower has new aftermarket SIFB modules. But the new ones remove the auto-power-down (w/ lanyard IN) feature... so you have to pull the lanyard OUT or the battery will drain.

A lot of what your describing makes me very suspect of the SIFB. You might try a new one.

Cheers!

[Mike Greenwood]

These guys will point you in the right direction

[Mike Greenwood]

As to being a problem that is on/off, could the inter cooler be oiled up partially then somehow allowing boost to pass as it hit a wave? Thoughts?

[HiPeRcO]

Intercooler is like a radiator, so I don't think it would behave as you are asking, unless there was fluid sloshing around where the air passes through. But you'd likely have a lot worse problems if that were the case.

[ripcuda]

Not following what you mean by the IC passing boost as you hit a wave?? What are you experiencing?

As Hiperco said (I'm saying that alot lately... nice!)... it's possible if you didn't remove the IC to thoroughly clean it out... that it still has oily gunk in it's depths. This gunk could then get blown out under full boost and waves and whatnot. Like coughing it up occasionally... which then hits the hardpipe MAP... fouls it... and sends the ECU back to wonkytown.

Glad the SIFB worked. Don't forget to always pull your lanyard OUT when ski is off.

Cheers!

[Mike Greenwood]

No guys brunoski killed my post. He was asking a whole different question. And hopefully will learn to stare this own thread ..........hint! He was asking about his own separate set of issues. You guys already OWN my solution!

[K447]

No guys brunoski killed my post. He was asking a whole different question. And hopefully will learn to stare this own thread ..........hint! He was asking about his own separate set of issues. You guys already OWN my solution!

Posts moved to a new thread.