Quote:
Originally Posted by 97-civic-ex
Again from memory,... the lean burn mode changed from altering AFRs from pre 2001 to just altering throttle control to post 2001.
Meaning true lean burn was no longer available for 2001 + model HX civics,... but I have read some conflicting reports that it is still offered even now. I haven't confirmed any of this myself, but I have done a lot of research on lean burn, vx, hx, 3-stage for pre 2001 models and am pretty confident what I wrote is true.
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For what it's worth:
I have an '01 HX. From what I've read, you can tell when it enters lean burn mode by watching the secondary O2 sensor output (should drop to zero) and you will feel a... stumble. I see both of these on my HX, and it is a California model. It has a wideband O2 sensor.