Knocking, lean mixture, and fault codes.... - Saab 900 Bulletin Board - Saabnet.com
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Knocking, lean mixture, and fault codes....
Posted by David Ingram [Email] (more from David Ingram) on Sun, 20 May 2001 17:37:17
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Getting fault codes 12111 and 12223, both regarding air leak/lean mixture conditions. As I am aiming to pass emissions for previously-failed NOx readings, I'd love some input on solutions to this one. I have replaced any obvious vaccuum hoses but the Check Engine light persists.
Also, I get knocking at moderate acceleration - not hard acceleration and not just loping around. Just that transitional zone.
I do have a noisy fuel pump (used replacement on hand already) and am wondering if a fuel pump that's low on output might lean out the mixture enough to up the NOx production?
What about such items as plugs, rotors, cap, wires?
Thanks for the help!
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