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Thread: Please Help With Overfueling

  1. 03-11-2011 #1
    TeacherCreature
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    Please Help With Overfueling

    3.4 set up on l67 sueprcharged...

    MAF O2 sensor and WIDEBAND are NEW
    Open Loop afr is 11.3-11.5 which is what I want

    Closed loop on light accel heavy accel and decel are afr is NUTS....
    My commanded afr is 14.2

    What could cause this and how to fix

    here is video - sry for sound quality try to ignore i know it sounds bad.
    Thanks

    http://www.youtube.com/watch?v=pVcdAOJd48o
    02 Regal GS - L67
    Wizardair CAI, 3.4 pulley, SLP Headers

    Watch out - 13s
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  2. 03-12-2011 #2
    TeacherCreature
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    bump anyone
    02 Regal GS - L67
    Wizardair CAI, 3.4 pulley, SLP Headers

    Watch out - 13s
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  3. 03-13-2011 #3
    bilemke
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    Scan and tune files? YouTube doesnt do much.

    "Closed loop on light accel heavy accel and decel are afr is NUTS....
    My commanded afr is 14.2"

    14.2 is a bit rich for closed loop since it should be 14.7. Is 14.2 a typo?
    97 Grand Prix GTP (not going to bother listing mods in detail) 1 messed up 97 PCM with about 30-50% of a 2003 calibration and parts of a few others.
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  4. 03-13-2011 #4
    murphinator
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    Quote Originally Posted by bilemke View Post
    Scan and tune files? YouTube doesnt do much.

    "Closed loop on light accel heavy accel and decel are afr is NUTS....
    My commanded afr is 14.2"

    14.2 is a bit rich for closed loop since it should be 14.7. Is 14.2 a typo?
    e10 stoich is 14.1x and since the pumps say may contain up to I have seen posts where people put 14.2 or 14.3 as stoich , I am making an ed. guess that is why 14.2

    the northeast is all e10
    PB's 1/4 mi 12.21 117.75 trap ,1/8 mi. 7.779 93.99trap , 1.949 short time (FWD W body)
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  5. 03-13-2011 #5
    GeoJB
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    Murph that response answers questions for me.
    I don't have enough experience to give an educated answer.
    Had a hunch ethanol was involved.
    The Regal has been laid to rest..... rust
    Now have an 06 Lucerne with the 3.8 and wishing HPT would cover that car
    Loved my 2001 Buick Regal GS.
    With more than 334,000K, 3.4 & 3.6 pulley, Change stats and pulleys with the seasons, Upgraded grounds & power wire, Volt booster, Caspers timing commander(AKA happy knob), Spectra intake-fender wall, PLog, 3" DP & 2.5 exhaust, HPTunner 12" Impala duel piston front brakes, New trans,GMPP suspension... yada, yada...
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  6. 03-13-2011 #6
    TeacherCreature
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    Yea thats right
    e10 and 14.2 is not a typo.


    I keep running to this thread everyday hoping some pro swooped in with an answer for me...

    Someone suggested O2 sensor fuse ? Gonna look for that tomorrow and replace if I can...

    I want to empty all the tables and put 14.2 and try to force it...
    I thought when u put 14.2 your STFT and LTFT jump around to try and get it to 14.2 but my computer is out of alignment or something the STFT and LTFT stay near zero but I get 10.8

    How do I let the computer know it is doing its job in the wrong place and should be like 3.4 higher/leaner

    Is there some other chart that might be off ? could this be Accel Enrich going nuts?

    here is the bin
    02 Regal GS - L67
    Wizardair CAI, 3.4 pulley, SLP Headers

    Watch out - 13s
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  7. 03-14-2011 #7
    murphinator
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    have you tried flashing your stock tune to eliminate the possibility you changed something thats causing an issue - we all do it sometimes

    when you are rich at cruise by the wideband what are the narrowbands doing ? if they are switching I would suspect a problem with the wideband or its wiring if they are pegged rich also then your rich
    PB's 1/4 mi 12.21 117.75 trap ,1/8 mi. 7.779 93.99trap , 1.949 short time (FWD W body)
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