Mangus TunerPro Author

Joined: 19 Mar 2003 Posts: 1801
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Posted: Mon Jul 18, 2016 11:04 am Post subject: |
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Fuel trim is stored in a course table that overlays the fuel table. One of the ALDL output values is "Fuel Trim Cell" (may be names slightly differently in each definition). This tells you what trim cell the vehicle is running in. The long term trim (BLM) value for that area of the table is stored in that cell.
INT, the integrator, is the short term value. It's the number that's actively used to correct the immediate rich/lean condition. Over time, BLM tracks with INT. Once stoichiometric has been reached, you should see INT hover around 128, though BLM may be far off of 128. This is basically the ECM saying "With BLM at X (e.g. 100), no further correction to fuel is needed to reach 14.7:1, therefore INT is centered at 128."
If BLM is resetting, i'd think you're either leaving closed loop, or the trim cell that you're running in doesn't have enough data to move BLM. _________________ ***************************************
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1989 Trans Am |
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