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  1. #1
    thompsdw's Avatar
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    04 RXP Knock Sensor Issues Continue .... Need Advice

    Well, I have been working on this damn thing for years, and just cannot seem to get it right. Last season I was plagued with a knock sensor problem after a complete engine rebuild. The error went off anywhere above 3,000 rpm. I replaced the knock sensor with a new new one, cleaned the mounting surface, and had the ECU updated and cleared. So yesterday was the begining of a break in period for the ski because it simply didn't happen last year.

    So yesterday we received the knock sensor code any time the RPMs exceeded 6,000 rpm. It would clear when the key was removed. I decided to ride the damn thing to see what would happen (I'm actually tired for working on this ski ). Ran fine all day and only threw the code if above 6,000 rpm.

    The engine has to be sound or the ski wouldn't have run for 4-5 hours yesterday with no issues. Has anyone ever seen a knock sensor code that is this sensitive to revs on the upper end?????

    Ideas on what to do next?????


  2. #2
    Old gas has done that before.

  3. #3
    jpeconsult's Avatar
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    Is this for the 2004 RXP or 2003 GTX?

    I have a 2005 GTX and added a knock sensor piggy back harness after upgrading to the 215 ECU. I experienced the same symptoms and realized the 215 ECU already had the sensor update AND I added the piggy back harness, so I was running two knock sensors. I removed the piggy back harness and it ran flawlessly.

    I am unsure when SD added the sensor, but try bypassing the sensor and see if that works. It may at least narrow the problem down.

  4. #4
    Site Admin Green Hulk's Avatar
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    are you by chance running an 04 RXP ECU in your GTX?

    If so the problem is you need to install the knock sensor update harness. It's a piggy back harness that plugs in between your stock wire harness and the actual knock sensor connector.

  5. #5
    Pwgsx's Avatar
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    ^ what he said and get the code cleared and run 92+ oct gas

  6. #6
    thompsdw's Avatar
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    Sorry guys, this is the 04 RXP (no GTX involvement at all). The new knock sensor is in place and the update harness is installed as well. I took it to the shop a month ago to have the ECU reflashed with the updated software. I removed all the gas last season and put fresh high octane fuel in the tank.

  7. #7
    Moderator beerdart's Avatar
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    It is possible that your pigtail is bad. Measure the resistance according to the 05 wire diagram.

  8. #8
    thompsdw's Avatar
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    Could an injector with a poor spray pattern cause this???

  9. #9
    Moderator beerdart's Avatar
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    Yes
    Quote Originally Posted by thompsdw View Post
    Could an injector with a poor spray pattern cause this???

  10. #10
    thompsdw's Avatar
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    But I would guess it would cause it across the entire RPM range? Kinda the same thing as improper timing?

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