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Thread: 07 R6 Stumble/miss fire. Coils, Injector, TPS, CAS?

  1. #1

    07 R6 Stumble/miss fire. Coils, Injector, TPS, CAS?

    Bike is missing at low rpm. Its pretty good until its warmed up, then it starts. Anything under 6k and it seems to be running on two cylinders.'

    Tested stock Coils
    Primary OEM spec resistance 1.19-1.61ohm
    Secondary OEM spec resistance 8.5-11.5ohm

    #1 p 1.6, s 9.64
    #2 p 1.6, s 8.46
    #3 p 1.7, s 9.73
    #4 p 1.6, s 9.72

    Coils were tested at room temp. It's recommended to stick them in the oven and get them at operating temp or so. I havent run this test yet.

    Coils Purchased off ebay, installed, ran slightly better.

    #1 p .5, s 5.6
    #2 p .4, s 4.6
    #3 p .4, s 5.8
    #4 p .6, s 5.6

    What the hell is going on with those?! Of course ebayer says came from running bike with 7k miles on it...

    Ideas, at 6-7krpm the secondary injectors kick in. At about that RPM everything is suddenly all good. So maybe my primary injectors are having an issue once hot. Service manual says to only visually inspect, no other testing available on your own.

    I'll check the TPS and make sure its clean, but it runs fine when cold. Crank angle sensor controls fuel delivery and I intend to check it next as well.

    Anyone with any insight chime in.

  2. #2
    Owner AutoMods's Avatar
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    are those coils from a different year bike? they seem to be off but they are all consistent
    9.875@150mph
    2012 Iowa Manual Shootout Champion, on low boost setting. -Flying Ryan
    "The bitterness of poor quality remains long after the sweetness of low price is forgotten." - Ben Franklin

  3. #3
    Sure seem like they must be. I haven't had time to find out. The listing I bought them from said out of an 06 or 07. Haven't left him feedback yet, tryin to decide what to do.

  4. #4
    IAF Team Member
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    Build up in primary injectors fuel rail or on top of injectors?
    Brent
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  5. #5
    Moderator slow ride's Avatar
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    Plugs and gap look good right?
    02' TT Z06
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  6. #6
    Injectors are out, appear all good. Rails clear. Plugs are new, and gapped to spec. New coils on the way, if those dont fix it injectors are going to the Clinic. The other "new" injectors were for an Rs not the badboy R6r

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