Blm ?

[Nicksturbo]

100 OCT MM chip 13GL of 94 + 5GL Zylean. Idle BLM were 122, at WTO my lowest 02 824. Does this sound right? And to rise the blems, or lower them, you do it with the fuel is this right? I am also running Alky.
Thanks, Nick

 

[Carolinaturbot6]

"There is nothing wrong with your chip or fuel delivery system, even in normal driving, when your BLM (Block Learn Mode) numbers are anywhere between 110 & 145. The car will still be running stoichiometrically correct no matter what the BLM numbers show, as long as they are between 110-145. Numbers below 128 show that the computer is taking away fuel & numbers above 128 show that the computer is adding fuel. In either case,the car is not running rich or lean! The BLM numbers basically show what fuel corrections the computer is making in order to keep fuel delivery stoichiometrically correct. BLM numbers will vary with types of gasoline, weather, & at idle when you turn on the a/c!
Now if your scan tool shows BLM numbers always way below 128 or way above 128, it shows that some fuel correction is necessary. Often this can be adjusted with the fuel pressure regulator. But still, the computer is working (only "harder") to keep the fuel mixture stoichiometrically correct. If BLM numbers are always below 110 or always above 145, that's when you start looking for a fueling problem!"

HTH