DFI and ECMDiscuss all aspects of DFI (Digital Fuel Injection), ECMs (Electronic Control Module), scanners, and diagnostic equipment. Fine tune your Third Gen computer system for top performance.
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I'm still pretty new to this too, but one thing that stands out is your BLM value. It's sitting on 150 throughout the whole log, which means the ECM is adding a lot of fuel to compensate for something. Also, the engine didn't get warm enough to go into closed loop. A longer datalog with the engine getting up to operating temperature might be more informative.
__________________ North Texas Third Gen Association 1988 GTA 5.0/M5/3.45 LSD, T-Tops, Digital Dash, Leather - Current Ride 1983 Firebird S/E - Stripped 1995 Chevy 1500 5.7 Ext. Cab - Daily Driver
I'm still pretty new to this too, but one thing that stands out is your BLM value. It's sitting on 150 throughout the whole log, which means the ECM is adding a lot of fuel to compensate for something. Also, the engine didn't get warm enough to go into closed loop. A longer datalog with the engine getting up to operating temperature might be more informative.
Thanks for replying Ward, i've just read an article on BLM and Block Learn Cells, its quite interesting. On the log there's 4 sessions, session number 4 goes into closed loop, the BLM still stays at 150, and the INT stays at 128. Which after i read the article, I dont think is right.
Can you recommend any howto's or tutorials on this? What have you been using to learn about ECM tuning?
Ah, I didn't notice there was more than one session in the log. Like I said, I'm still pretty new to this
Pretty much all of the info I have found is either by digging around through threads here, or searching google for specific things like "ECM BLM", etc.
Lots of them are OBD2-specific, but the principles are the same. I recommend checking out the "Fuel Trims" videos, they give a good description of how the fuel trims actually work. In our case, INT (Integrator) is the short term trim, and BLM (Block Learn Mode) is the long term fuel trim.
__________________ North Texas Third Gen Association 1988 GTA 5.0/M5/3.45 LSD, T-Tops, Digital Dash, Leather - Current Ride 1983 Firebird S/E - Stripped 1995 Chevy 1500 5.7 Ext. Cab - Daily Driver
