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This thread is old but I have something to add. In another lean burn post it was mentioned that the cat needs to warm up to temperature in order for lean-burn to activate. I know for a fact (for the HX atleast) that you do not even need a cat in order to use lean burn. You dont even need the secondary o2 sensor. After I swapped my engine with a new one I had to replace the exhaust manifold. Long story short, I needed to wait until I got a new direct fit cat for another model to have it cut and welded in to my exhaust. I drove without a cat or secondary o2 sensor (check engine light on) and was still able to go into lean burn. Just thought someone might want to know that cat temperature or emissions past the first o2 sensor have nothing to do with lean burn.
It seems intake temperatures have a huge impact on lean burn. Or atleast for me. Its been about 60 degress or less this week and my car does not want to stay in lean burn for long. No matter how careful I am to keep throttle position low. On monday it was above 75 degrees and I stayed in lean burn the entire trip on the highway with no problems. So it would appear that colder air intake temps can keep you out of lean burn. Can anyone else confirm this?
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