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Rich or lean

This is a discussion on Rich or lean within the External Engine forums, part of the LSx Technical Help Section category; Can anyone tell me how one tells if a car is running an A/F ratio that is too rich or ...

  1. #1
    Rice Hungry GottaHaveLS1's Avatar
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    Rich or lean

    Can anyone tell me how one tells if a car is running an A/F ratio that is too rich or too lean? If it's too rich, i think one would smell it sometimes, but are there any other effects?

  2. #2
    Impounded x-40oz-x's Avatar
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    1981 g-Body

    There will be more smoke come from your exhaust if it's too rich. Also on a carb it will flood it.

  3. #3
    LT1KING GOODZ/BADZ's Avatar
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    If it's rich you'll have poor gas mileage and you'll smell it in the exhaust and feel it burn your eyes . If it's lean you'll have a loss in power. If you have access to a scanner hook it up and check the air/fuel ratio, 14.7 to 1 is the ideal mixture.

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    Member keliente's Avatar
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    99 Firebird Formula

    Quote Originally Posted by GOODZ/BADZ
    If it's rich you'll have poor gas mileage and you'll smell it in the exhaust and feel it burn your eyes . If it's lean you'll have a loss in power. If you have access to a scanner hook it up and check the air/fuel ratio, 14.7 to 1 is the ideal mixture.
    Hypothetically speaking. In real life when tuning cars, an idle might be that lean, but at WOT the a/f is anywhere in the 12.5-13.5 range.

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