Quote:
Originally Posted by Clev
Interesting. If it's RPM-independent, maybe a vacuum gauge would help. If you could determine that a specific point of vacuum corresponds to entering/leaving lean-burn, you could then mark the vacuum gauge at that point and have a nice easy-to-glance-at gauge that helps you stay in lean-burn.
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So I just added a vacuum gauge on my Civic... looks like it is vacuum dependent, and I haven't (yet) noticed it responding to rpm. At cruising speed (anywhere from 50-65mph) any vacuum more than about 6in Hg keeps it in lean burn, anything less knocks it out... hope that helps.