first off im not into the whole prom burning yet. i have an autoxray and its telling me i got 115 blms at idle and throughout driving it range from 112-120. i know 128 is perfect so is the blm's reading lower mean that its too rich or too lean. not sure which way means what. and not sure why its reading lower, here are the specs on the car. 1989 Iroc-Z 305 TPI MAF, 5 Speed, swapped motor to a 5.7 from a speed density 1991 Z28, but kept all the maf equipment and stock computer from the 89', ford 19lb injectors, afpr set to stock for now. stock manifolds and brand new single wire o2 sensor.

 

BL's are for adjusting the pulse width,
so a lower number means the engine is rich, and the BL's are lower in order to reduce the amount of PW/ fuel going to the motor.

 

thanks that is what i needed to know. is 115 too low for the stock ecu to compensate for? like is there a range to how far they can be off of 128.

 

I was just datalogging my car and my BMLs are always into the 140s. Ouch.

 

I got 108 blm's, how do you adjust that in a SD? Raising Injector flow rate? 30lb injectors, Injector flow rate already set to 35

 

Low Block Learns can/are caused by the CCP cycle. Be sure to disable it before tuning. Then re-enable it once done. Or, re-enable it on a regular basis to keep it purged.

RBob.

 

I feel like an idiot, but I got no clue what that is

 

C charcoal
C canister
P purge