Re: HELP! How do you correct lean air/fuel mixture at idle? - Saab 900 Bulletin Board - Saabnet.com
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Re: HELP! How do you correct lean air/fuel mixture at idle?
Posted by JCB (more from JCB) on Tue, 20 Mar 2001 00:59:16
In Reply to: HELP! How do you correct lean air/fuel mixture at idle?, Chris, Mon, 19 Mar 2001 19:01:16
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Maybe there is a leak you're missing? What about all the vacuum plumbing for the heat and A/C? Have you check system with a vacuum pump (such as a MityVac)? If there is NO leak, would seem that the AMM or O2 sensor are defective.
Now, what am I missing? I understand the O2 sensor reading indicating a lean condition. But, why would a lean condition increase the HC? Aren't HC's a byproduct of incomplete oxidation (not enough oxygen)? I thought lean conditions contributed to NOx, but not HC.
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