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Thread: Fuel cutout issue (possible free beer inside)

  1. #21
    Joe (Moderator) joecar's Avatar
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    Your B3647 is stoich everywhere until the 100 kPa column... you want to start increasing fueling earlier (i.e. engine load can still be quite significant at 80 kPa, for example);

    also if you ever go closed loop, then on high load you want PE to provide fueling.

    ( ah, looking at your tune, PE is enabled already )


    You don't really have to worry about lugging the engine in 3rd, it has plenty of torque to pull the vehicle smartly; same with 4th gear for a car, but not necessarily a truck.


    You can fix the bogging by removing fuel (bump down the VE table in the low area)...
    in the low area, unburnt fuel goes thru to the exhaust, this registers as lean (unburnt fuel = unburnt oxygen), so it makes you add too much fuel (by bumping up the VE table)...
    so just remove some (by bumping down the VE table) just in that area.


    If AFR 14.2 is due to you running E10, then yes the PCM will be able to trim to it (set B3601 to 14.2)...
    your wideband reports AFR based on E00...
    so you should use lambda (from the WB) and EQR from the PCM...
    ( the correction factor is then simply lambda x EQR ).

    No, this family of PCM's is designed to handle only NB O2 sensors... the LSU4.2/LSU4.9 will not work with the PCM (they will only work with a WB controller, or an ECM designed specifically to use the LSU's, for example any of the self tuning aftermarket EFI kits, and some European vehicles).

  2. #22
    Junior Member
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    Jan 2018
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    Quote Originally Posted by joecar View Post
    Your B3647 is stoich everywhere until the 100 kPa column... you want to start increasing fueling earlier (i.e. engine load can still be quite significant at 80 kPa, for example);

    also if you ever go closed loop, then on high load you want PE to provide fueling.

    ( ah, looking at your tune, PE is enabled already )


    You don't really have to worry about lugging the engine in 3rd, it has plenty of torque to pull the vehicle smartly; same with 4th gear for a car, but not necessarily a truck.


    You can fix the bogging by removing fuel (bump down the VE table in the low area)...
    in the low area, unburnt fuel goes thru to the exhaust, this registers as lean (unburnt fuel = unburnt oxygen), so it makes you add too much fuel (by bumping up the VE table)...
    so just remove some (by bumping down the VE table) just in that area.


    If AFR 14.2 is due to you running E10, then yes the PCM will be able to trim to it (set B3601 to 14.2)...
    your wideband reports AFR based on E00...
    so you should use lambda (from the WB) and EQR from the PCM...
    ( the correction factor is then simply lambda x EQR ).

    No, this family of PCM's is designed to handle only NB O2 sensors... the LSU4.2/LSU4.9 will not work with the PCM (they will only work with a WB controller, or an ECM designed specifically to use the LSU's, for example any of the self tuning aftermarket EFI kits, and some European vehicles).
    Thank you Joe, Yeah the truck weighs roughly 5k with a factory stall converter since I wanted other drive train components to live. My issue now is the truck is taking 42 lb marine injectors to 88% duty cycle at full swing with 60-63 psi going through them. Far cry from the old 5.3 only being at 44%

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