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Old 04-05-2014   #25
XfireZ51
 
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,686
Default Re: 1991 ZR1 ODB1 Port Location

Quote:
Originally Posted by roadczar View Post
What does BLM stand for?
Block Learn Multiplier. It is active in Closed Loop. At 128, it means the ECM is making no change to the base fuel map. So a scantool will tell you if you're running rich or lean and where.
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