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Thread: Afr fluctuations with olsd

  1. #1
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    Default Afr fluctuations with olsd

    Hi all. I have been battling this issue for months now and still can not seem to figure it out. My issue is that the car starts and runs great and idles right around 15.0 but as it warms up eventually gets to about 12.8. I first thought it was something that i had messed up in my tune so I decided i would bite the bullet and buy a tune from a very well known reputable tuner. Well it still does it. I contacted the tuner i bought the tune from and he says that running in olsd that the car will only run off the main ve table so there has to be something else going on with the fuel system. Is he right about the ve table that nothing else will add or subtract when running in olsd? I can post logs if this is not the case and there are other factors that will effect idle afr. Car runs perfect otherwise.


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  2. #2
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    Quote Originally Posted by johnj View Post
    My issue is that the car starts and runs great and idles right around 15.0 but as it warms up eventually gets to about 12.8. I first thought it was something that i had messed up in my tune so I decided i would bite the bullet and buy a tune from a very well known reputable tuner. Well it still does it. I contacted the tuner i bought the tune from and he says that running in olsd that the car will only run off the main ve table so there has to be something else going on with the fuel system. Is he right about the ve table that nothing else will add or subtract when running in olsd?
    No, he is wrong... and I don't care how well known or reputable he is, if he can't fix your issue then he is a useless tuner and shouldn't be selling tunes.

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    Well thanks for the reply. Any thoughts on correcting my issue then?


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    Quote Originally Posted by johnj View Post
    Well thanks for the reply. Any thoughts on correcting my issue then?
    Yeah... fix your Injector Data, then fix your Charge Temperature Blending table, then retune your VE table.

    It's not easily done... which is why your tuner blew you off.

  5. #5
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    Thanks a bunch I will give that a go.


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  6. #6
    Joe (Moderator) joecar's Avatar
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    Post tune and log files.

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    Are there any certain pids you would like me to monitor


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  8. #8
    Joe (Moderator) joecar's Avatar
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    eqivratio
    longft1/2
    dynair
    dyncylair
    tp
    rpm
    sparkadv
    kr
    ect
    iat
    ibpw1/2

    edit: and my all uppercase got reformatted to lower.

  9. #9
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    I have finally gotten some free time to get a log of the car idling. Heres the log and tune.rambler new tune 8.ctz rambler idle.efi

  10. #10
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by johnj View Post
    I have finally gotten some free time to get a log of the car idling. Heres the log and tune.rambler new tune 8.ctz rambler idle.efi
    Your wideband AFR is fluctuating just a little, that's not so bad... the problem is that it is too rich, wb 12.2 vs commanded 14.5.

    Is your VE table corrected...?

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