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Old 08-21-2007, 12:19 AM   #1
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Join Date: Aug 2007
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Default Odd idling

I drive a 1994 SOHC 1.9L SL and I've been having an issue in which I think I have an inkling as to what's causing it, but I'm not sure, so here I am! When I am stopped (Like at a light), the engine will start idling high to about 1500rpms and then drops below 1000rpms. Then the check engine light comes on. This happens EVERY time it is hot outside or excessively humid. In mornings and evenings this doesn't happen, unless it's really humid out. I think it might be the O2 sensor, since hot air expands and maybe it throws it off?
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