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Thread: 4-tec Missing

  1. #1

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    4-tec Missing

    I have a 2005 RXP I recently bought used. I noticed it had an upgraded RXP-X supercharger so I started doing some research on what injectors it should have in it and got mixed opinions. It had the stock ones and now I put 42's. But now it seems like there is a miss at part/wide open throttle. It runs pretty good, but sort of jerks a bit and is not totally smooth.

    I am wondering if it is running too rich now and causing the missing? I guess it could be plugs too, not sure. But I am gonna try new plugs first, then if that doesnt solve it, try putting the stock injectors back in.

    The ski hits 70mph (gps) and 8000rpm so it is healthy.

    Do you think it is fuel or spark related?


  2. #2
    Fast & Loud meeper's Avatar
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    you want to be around 8100 with that year ski... it should be hitting much more rpms that even that if the ski has an x charger...

  3. #3
    Moderator beerdart's Avatar
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    Huh!! he is hitting 8000 how does the x-charger raise the rev limit?
    Quote Originally Posted by meeper View Post
    you want to be around 8100 with that year ski... it should be hitting much more rpms that even that if the ski has an x charger...

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    Quote Originally Posted by beerdart View Post
    Huh!! he is hitting 8000 how does the x-charger raise the rev limit?
    Thats what I was thinking...rev limiter is 8k right?

  5. #5
    Moderator beerdart's Avatar
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    Soft limit 8200ish Try plugs first.
    Quote Originally Posted by boostedz06 View Post
    Thats what I was thinking...rev limiter is 8k right?

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    83.0 @ 8400 jhill19's Avatar
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    he should be banging off the rev limiter running a x charger and stock prop.

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    Guess I just need to install the bung for my wideband and check the AFR and play around with injector swaps.

  8. #8
    Fast & Loud meeper's Avatar
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    Quote Originally Posted by beerdart View Post
    Huh!! he is hitting 8000 how does the x-charger raise the rev limit?
    i never said it raised the limit, i say with an x charger on a stock ski he should be seeing more than 8000 rpms.... putting words in my mouth

  9. #9
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by boostedz06 View Post

    Do you think it is fuel or spark related?
    Spark! Install a fresh set of spark plugs
    http://www.4-tecperformance.com/inde...oducts_id=1305

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    Quote Originally Posted by Green Hulk View Post
    Spark! Install a fresh set of spark plugs
    http://www.4-tecperformance.com/inde...oducts_id=1305
    Yeah I did yesterday, but didnt get time to put it in and test it, only idle and rev and I couldnt tell the difference...but hearing this from you gives me more confidence Now I have to impatiently wait till Saturday to find out if that was the issue...

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