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Thread: rough idle issues

  1. #21
    Tuner in Training
    Join Date
    Aug 2011
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    13
    What did you mess with on the idle timing?? did you advance?? retard?? smooth?? im having A Similar issue.

  2. #22
    Advanced Tuner silverbullet08's Avatar
    Join Date
    Dec 2009
    Location
    Houston, TX
    Posts
    453
    I tried to make a thread to help with rough idle and timing tables, I got mixed ideas on it. Some were saying to lower timing and smooth, others were saying raise timing and smooth. My suggestion is check your idle cells in the 20% to 40% load areas in the Spark tables and MAF Correction tables. Make sure there isnt any huge differences between these load sections at idle rpm. There will be a difference slightly when you turn the AC on causing a higher load but the difference should be within 5% or i start to have issues. For example in my table MAF correction 30%load is 1.007, then 40% "ac on" is .9922. This is in the 800rpm range and is just as close at 1000rpms
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  3. #23
    Tuner in Training
    Join Date
    Aug 2011
    Posts
    13
    I just posted in your other thread before seeing your response over here. It looks like my timing advancement is very high in the low RPM and low load cells. And it doesn't show any MAF correction down there. (I'm mostly having the problem with cold starts) i did a cold start log and the timing seemed eratic on the charts. Ill post the log if someone could tell me how. (I don't know how to post a log on a forum.) lol.

  4. #24
    Senior Tuner BackyardTurbo_FTW's Avatar
    Join Date
    Jul 2009
    Location
    East Suckburg, PA
    Posts
    1,163
    Try the tables I posted and make sure your MAF is properly adjusted.