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Way Too Rich At Part Throttle

This is a discussion on Way Too Rich At Part Throttle within the Computer & Tuning forums, part of the LSx Technical Help Section category; i need a little . i cant seem to figure out why my pcm is commading the injectors to dump ...

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    Way Too Rich At Part Throttle

    i need a little . i cant seem to figure out why my pcm is commading the injectors to dump so much fuel at part throttle. it used to just do it on decel and high map,rpm areas. i adjusted the voltage ofset and no longer have the problem on decel but now it dumps fuel at 25% throttle and up. any advice is greatly appreciated
    ive done the ve tuning and it was good in the areas i now have trouble in. it is 2 bar OLSD with 42# injectors
    Last edited by vaticano; 09-23-2007 at 07:27 PM. Reason: more info

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    Senior Member mrr23's Avatar
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    what are you using as the IFR? also, the injector offset vs battery voltage may need tweaking.

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    Quote Originally Posted by mrr23 View Post
    what are you using as the IFR? also, the injector offset vs battery voltage may need tweaking.
    i changed the voltage offset to correct the decel fuel that was rich and that worked, but now it's rich at part throttle. and it wasn't before, so i did do a little treaking,i set the areas above 50 kpa, this is where the problem is, back to stock which made no difference.
    LABELS Injector Flow Rate (Grams/Second)
    Manifold Vacuum kPa {link: GM.MANVAC} Value
    0 6.359375
    5 6.398438
    10 6.437500
    15 6.476563
    20 6.507813
    25 6.546875
    30 6.585938
    35 6.617188
    40 6.656250
    45 6.687500
    50 6.726563
    55 6.757813
    60 6.796875
    65 6.828125
    70 6.867188
    75 6.898438
    80 6.929688

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    Senior Member mrr23's Avatar
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    put the offset voltage back to original.

    there is a minimum pulse width parameter. lower that.

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    i' ll give it a shot thank you

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    seems to have helped the decel richness but it doesn't run right. it goes lean and bucks. it didn't help the part throttle richness at all

  7. #7
    Senior Member mrr23's Avatar
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    how much did you lower the minimum pulse width?

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    Senior Member mrr23's Avatar
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    also, what is your IFR table numbers?

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