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Randomly lean?

 
Old 03-30-2015, 05:07 PM
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Default Randomly lean?

Ive got a 1990 1.6 MX running MS1 (MSPNP), LC1 and IAT (MAF delete).
I loaded the basemap, bought tunerstudio, set up a little rich AFT-target table and started tuning. Got my idle nice and stable and WUE works good too. No problem starting either.

On Saturday I went for a long drive. Use VE analyzer to autotune. Quite happy with the result I stopped the car and waited 16 hours before I took another run. Not that long, but AFR was still good. Then I waited 4 hours and too another run (evening). This time the AFR was good at idle, but when I started driving and WUE was completed, the AFR wen lean! I had to stop the car and change the VE-table to be able to drive home safely.

The question is. Why? MAT / CLT correction? This was a cold evening. The CLT was about 85c (185 F). And the IAT-sensor showed 12 C (53.6F). So if I understand correctly, MAF / CLT correction is not what made it go lean. Or am I wrong?

Edit: What? My WUE is under 100% Hmmmmm.. This must be causing me problems?
Attached Thumbnails Randomly lean?-screenshot-2015-03-30-23.05.32.png   Randomly lean?-screenshot-2015-03-30-23.04.54.png   Randomly lean?-screenshot-2015-03-30-23.04.42.png  
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mx53_2015-03-28_14.55.34.msq (41.8 KB, 153 views)
File Type: msl
2015-03-29_21.33.44.msl (35.1 KB, 61 views)
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Old 03-31-2015, 09:37 AM
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ASE is typically under 100%; WUE should not be.
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