Quote:
Originally Posted by RPM
I do believe that it is a lean burn indicator. It's just that you're in lean burn all the time, unless you are almost flooring it or exceeding the lean burn rev limit. An AFR gauge would be more useful because being in learn burn doesn't necessarily mean you are using the leanest possible mixture the motor is capable of (21:1?), i.e. 16:1 is still lean burn.
To maximize FE in my car you have to interpret the subtle changes in the accelerator's response in order to use the leanest possible mixture for the current driving conditions.
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The d15b is in 3 valve operation most of the time under light throttle which is what the eco light indicates. Under the right throttle and rpm settings the car will enter lean burn like you're talking about
Most of what I read about pin 30 was from the D15 swap ecu and thread
The d15b is a great little motor, it was the culmination of the 10 year development cycle of the 1.5 liter motor they originally set out to create as a model of effecient and power. It also uses only narrow band 4 wire sensors instead of the expensive 5 band on our us spec 1.6
Our us spec hx models only drop into 3 valve operation at higher vehicle speed with lean burn mode