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Thread: (OL - Not Ready) Lean Cold Start

  1. #1
    Tuner in Training
    Join Date
    Mar 2019
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    44

    (OL - Not Ready) Lean Cold Start

    I need a bit of help to understand how to effectively tweak / tune my lean cold start issue. Attached my cold start log file and my current tune. Also attached the log file when the car is at operating temps.
    Note that I have tweaked my O2 delay to account for my headers. I assume I need to tweak FA Cold Enrich, more? Is there anything else? The VE tables are getting closer to what I need them to be, but still need a bit more tweaking - see Operating temp log

    Would welcome any other recommendations
    Attached Images Attached Images
    Attached Files Attached Files

  2. #2
    Senior Tuner
    Join Date
    May 2015
    Posts
    1,908
    Any actual symptoms to it running lean on startup? With no load and the engine free revving, lean isn't necessarily harmful.

    I don't see a wideband in your log? difficult to recommend changes without a log showing it is actually lean.

  3. #3
    Tuner in Training
    Join Date
    Mar 2019
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    44
    No real symptoms as such... Was just looking at the values after the O2 sensors came online, not decreasing much. However when I clear the log and run the scanner again under normal operating temps it did actually seem fine.
    Will install my wide-band this weekend. It finally arrived today. Bung already welded-in ;-)

  4. #4
    Senior Tuner
    Join Date
    May 2015
    Posts
    1,908
    Gotcha - wouldn't worry too too much about it, but for sure that is the correct table to play with to get it to run richer on cold starts.

  5. #5
    Tuner in Training
    Join Date
    Mar 2019
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    44
    Awesome, Thanks.