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Thread: Learning Issues

  1. #1

    Default Learning Issues

    I've been having issues when the system is in Learn mode. Engine runs rough & misses, uses excessive fuel, won't idle, stays at a AFR between 14.9-15.2, and won't change under WOT or idle. As soon as I turn Learn & Closed Loop off, the engine runs better, excessive fuel at idle and it uses too much while cruising, but at least I can drive it. I do have a large cam with big overlap, and vacuum at idle is around 5 inHg, at cruse it gets to 12 inHg. I run the Wizard on "race cam" and set my desired timing & idle speeds.

    I've replaced the WBO2 sensor already with a Holley replacement. I use 4 into 1 long tube headers with the WBO2 sensor set about 2" after the collectors. I run a Dual Sync distributor too. Any suggestions on what I can adjust to help this?

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    19,280

    Default

    When the engine is tuned & running well, you should decrease the Closed Loop and Learned Compensation Limits % to lock in a good tune.
    I decreased my Learned Compensation Limits to 2% in the idle area (10% elsewhere). My Closed Loop Compensation Limits are 20% or less.
    When the Learn Table values stop making significant changes, the ECU is finished self-tuning.
    http://forums.holley.com/showthread....7370#post47370 (Learn Table - Read this thread, especially posts #2, #6 & #11.)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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