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Old 11-25-2015, 06:25 PM   #1
Scooby Newbie
Member#: 337850
Join Date: Nov 2012
Chapter/Region: International
Location: Saskatchewan
2004 Impreza

Default Lean AFR at idle

Hey so I am getting an AFR from 16-17 at idle with AF corrections of a maxed out 25%. Perfectly normal AFR under driving and wot conditions. Recently did spark plugs, why would I be getting a lean condition only under idle?

Would having the stock air intake not seated completely perfect cause it to be lean only at idle? or is it more likely a vacuum leak?
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Old 11-25-2015, 06:34 PM   #2
Scooby Newbie
Member#: 425250
Join Date: Jul 2015
Location: MA
2007 WRX
Satin Pearl White


Maybe the MAF sensor is tilted? Needs to be in the same position as it was, I don't know how bad your intake is seated, but check it
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