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Thread: Fuel smell at idle

  1. #1
    Lifetime Member picnic_george's Avatar
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    Default Fuel smell at idle

    OK this has been covered a million times. But the typical idle smell is happening.
    The cam is not very big, #s are .613/.576 227/234 115, this has very little overlap. When I make idle around 16:1 the smell goes away. But as soon as I set it back to 14.7 or turn on the o2 sensors which switch around 14.7 it gets a little smelly again.

    Is this just something that can't be fixed or does it seem like there is a mechanical problem with the car? That cam profile is odd to me so I'm not sure what to think. Stock LS6 with headers exhaust etc.. I won't lose any sleep over it if there is nothing to be looking at.

  2. #2
    Lifetime Member picnic_george's Avatar
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    BUMP

    The cam had a bunch of advance ground into it which may have had something to do with it. I got it a lot better but the fuel trims don't make me real happy at idle. That car runs and drives great.

    But for reference. Is there a trick I'm missing? I have't played with closed loop proportional idle tables, will that help?

  3. #3
    Lifetime Member 5.7ute's Avatar
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    I found that my best idle stability was around 15.6:1 & kept closed loop turned off around idle. (I use a COS & use semi closed loop) If I allowed trims to be active I would also get the fuel smell & idle quality wasnt great.
    Give it what it likes instead of trying to hit a number & you will both be happier..
    The Tremor at AIR

  4. #4
    Lifetime Member picnic_george's Avatar
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    I think that's a great way to do it for a lot of applications. But for MAF enabled CL I don't think that is possible is it?

  5. #5
    Lifetime Member 5.7ute's Avatar
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    You could lower the O2 switchpoints in the idle areas, which will keep it leaner.
    Also you can run a COS & retain the maf.
    The Tremor at AIR

  6. #6
    Lifetime Member picnic_george's Avatar
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    I'll have to look into lowering the switch points in the idle areas. Haven't played with that. Thanks

  7. #7
    Lifetime Member Boost's Avatar
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