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  1. #1

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    MSX150 revving 8200 after start

    A friend of mine has a Polaris MSX150 and when he starts the engine it revvs up to 8200rpm,

    apparently this is normal on most of these machines but should be ok when put in water..but problem is still happening even in sea :S

    intercooler was cleaned, 2 map sensors were replaced, issue still persists :S
    Last edited by dijsil; 09-27-2014 at 12:01 PM.


  2. #2
    ripcuda's Avatar
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    Still reving full throttle when in the water?? As in, your finger is off the throttle and the ski takes off?

    Wow... that's pretty dangerous.

    First check for a leak between the head and intake manifold... and the intake manifold and the throttle body. Also check the boost/vac source banjo on the front side of the intake. A big leak at any of these points could cause out of control idle... as the ECU can't stop a leak from reving the engine.

    Then I'd check throttle cable between the trigger and the PPU unit. PPU is under the front hood (remove bucket) and you'll see this black box bolted above the fuel tank with the throttle cable going to it and wire connected too. Check the throttle cable has a tad bit of slack to ensure it is returning to the fully closed position and there's no binding or anything.

    If good, try an ECU throttle sweep relearn procedure.
    Ski off, put lanyard in, tap starter (but don't start) to wake up system. Should hear fuel pump hum. Slowly squeeze throttle trigger to full... hold 2 seconds... slowly release trigger to none... pause 2 seconds... repeat 2 more times. Then pull the lanyard and wait a couple three minutes before starting. This is an important step to do whenever I've swapped ECUs for testing. Bad ECU cached data for throttle control makes for some weird and odd running and throttling.

    Next, pull the hardpipe from the intercooler to the intake. You'll see the throttle body. You might even pull this off before you do the ECU throttle sweep relearn. But the idea is to be able to see the throttle body open and close and see if it'll fully close and open.

    If still not fixed... I'd suspect a possible bad PPU. If you could find a dealer to hook up Polaris Digital Wrench to it... a bad PPU would be throwing codes that should make it more obvious.

    Let us know what you find.

    Cheers!

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by ripcuda View Post
    Still reving full throttle when in the water?? As in, your finger is off the throttle and the ski takes off?

    Wow... that's pretty dangerous.

    ...
    Or the driveline splines are stripped and the impeller is not actually putting a load on the engine.

    No thrust from the jet pump in that case, so fairly easy to tell.

  4. #4

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    will try the above and let you know.

    thanks for the quick replies.

  5. #5

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    the problem of was caused by turbo was loose and intercooler was full with oil also cleaned both sensors.

    now it is revving only till 6k and not getting more than 60km/hr :S any ideas?
    all silicone hoses are tight

  6. #6
    ripcuda's Avatar
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    What's the story for the ski? How did the intercooler get full of oil? Was the oil level overfilled? Did you get water in the oil?

    Did you check the intake manifold? Did you check the throttle body to intake boot? Did you do the ECU throttle relearn?

    What does 'turbo was loose' mean?

    A case of oil ingestion... oil in the intake tract... in the intercooler is no trivial matter. You need to fully clean the entire intake tract and will likely need new MAP sensors (oil will damage the air temp filament). Even then, the ECU can get stuck on bad sensor data from previous running (cached in memory)... and cause issues. Do some searches for 'MSX oil ingestion'... there's lots to read.

    Cheers!

  7. #7

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    the turbo had bearings problem and the whole turbo was replaced with a kkk k03, the intercooler got full of oil due to overfilling

    the intake manifold and intercooler where cleaned and checked the throttle body and everything seems ok.

    the turbo had some bolts loose that are connected to the mainfold and was leaking air

    how can you do ecu throttle learn?
    also how can you reset the ecu? do you need special equipment?

    when the ski is started the you could feel the power for the first 3 seconds but then it kind of looses the power.

    Edit: also while riding if you switch off the engine and try and get it on again it takes a bit long to start and sounds like it is without air

    also found the plugs where black probably it is overfueling
    Last edited by dijsil; 09-30-2014 at 09:17 AM.

  8. #8

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    ski is revving 5850, both map sensors have been replaced and even o2 sensor.

  9. #9
    ripcuda's Avatar
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    Did you inspect the throttle trigger to PPU cable for slack? Did you perform the ECU throttle relearn procedure (detailed in post above)?

    Have you watched (remove hard pipe) the throttle body plate move open/closed? (maybe malfunctioning electronic throttle body)

    Is the ski revving up to 5850 on it's own... with NO trigger input?

    No way to reset the ECU without specialized equipment. Martin (GH member Desperado) at Precision Sports can reflash the ECU. This will clear all stuck codes (if any) and return ECU back to normal. This procedure has been needed to be done by a handful of folks in the past when they had oil ingestion issues. Seems the ECU gets stuck on bad sensor data and can't get it clear even when sensors and problem is fixed. If you had a 2nd ECU... MSX 150 or MSX 110... you could swap it in... do an ECU throttle relearn... and test it out. Could prove whether your ECU is the fault.

    Does it idle normal and steady at 1500-1550 rpms?

    Cheers!

  10. #10

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    Quote Originally Posted by ripcuda View Post
    Did you inspect the throttle trigger to PPU cable for slack? Did you perform the ECU throttle relearn procedure (detailed in post above)?

    Have you watched (remove hard pipe) the throttle body plate move open/closed? (maybe malfunctioning electronic throttle body)

    Is the ski revving up to 5850 on it's own... with NO trigger input?

    No way to reset the ECU without specialized equipment. Martin (GH member Desperado) at Precision Sports can reflash the ECU. This will clear all stuck codes (if any) and return ECU back to normal. This procedure has been needed to be done by a handful of folks in the past when they had oil ingestion issues. Seems the ECU gets stuck on bad sensor data and can't get it clear even when sensors and problem is fixed. If you had a 2nd ECU... MSX 150 or MSX 110... you could swap it in... do an ECU throttle relearn... and test it out. Could prove whether your ECU is the fault.

    Does it idle normal and steady at 1500-1550 rpms?

    Cheers!
    the ski is revving up to 5850 when it is in the water with full throttle.

    locally there is no polaris dealer, will need to send the ecu abroad.
    will try and find someone that has same model, and try and replace it before I send over for reflash but since I live in a small island its a bit hard since they are not that common.

    will try the ecu throttle learn.

    and yes it is idling normal and steady at 1500-1550rpm
    Last edited by dijsil; 10-07-2014 at 01:45 PM.

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