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Old 04-03-2013, 09:34 AM
upallnight upallnight is offline
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Location: Crook County
 
Join Date: Nov 2012
Posts: 428
Mein Auto: BMW, Lotus, Porsche
If only one bank that is lean I would look at the disa valve to see if the flap is operating or stuck. While you are at it, when you remove the disa valve there should be some resistance, there should also be some resistance when you re install the valve. If there isn't any resistance, the problem is the seal between the valve and intake manifold. You can replace the disa valve or you can replace the seal with an o-ring. Just Google or Youtube disa valve o-ring.
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