Below is a statement from the manual of LT1edit. Do they have this backwards. I thought if my BLMs were below 128 then my car was rich and so the correction subtracted some fuel.

I think this because any number 108 through 127 when divided by 128 gives a number less than 1. When a number less than 1 is multiplied into the pulse width it reduces the overall number of the pulse width so less fuel.

**from the manual****
BLM Control
BLM = Block Learn Multiplier. It is the way the PCM learns about small changes. A block learn of 128 means that the fuel control is perfect. If the BLM is below 128, then the PCM believes the engine is lean, and will add fuel. A BLM above 128 means that the PCM thinks the engine is Rich, and will subtract fuel in closed loop. These parameters control the Block Learn algoritm, and define the 16 basic Block learn Cells.
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I am confused. Please tell me the manual is wrong.

 

you must have a different manual as mine does not mention BLM's

However you are right less than 128 means that without correction the car would be running rich and greater than 128 implies lean

 

Thxs, it's the one you download from carputings website.

 

I likely have an old one as i got my lt1 edit about 4 years ago