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Old 08-30-2012, 10:08 PM   #1
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Default large oscillation in AFR at freeway speed datalog attached

Im having trouble getting rid of my AFR oscillation that starts when i get up to freeway speeds 60-75, when i cruise at 50 its pretty stable between .5 AFR but above 60 it will jump from 14-18 at a very consistent frequency. any ideas????

More details, running ms3x, maf delete, speed density iat sensor, pretty sure im running closed loop? IS there a way to run open loop in MS?
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large oscillation in AFR at freeway speed datalog attached-freeway-afr-occilation.png  

Last edited by nwNAMiata; 08-30-2012 at 11:24 PM.
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Old 08-30-2012, 10:41 PM   #2
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Originally Posted by nwNAMiata View Post
Im having trouble getting rid of my AFR oscillation that starts when i get up to freeway speeds 60-75, when i cruise at 50 its pretty stable between .5 AFR but above 60 it will jump from 14-18 at a very consistent frequency. any ideas????
Running open or closed loop?
Which ECU? (MS1 PNP, MS2 DIY..)
AFM, MAF or speed/density with auxiliary IAT?
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Old 08-30-2012, 11:25 PM   #3
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sorry, updated with more info, also running AEM linear wideband.
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