What does the INT table mean???? If I understand correctly the BLM needs to be at 128 any higher means lean and lower means rich. Any other quick rules of thumb to go by when reading this data? Also if my O2 sensor reads from 1volt to .001V almost instantly with no change in throttle position does it mean that it is junk or is the sampling rate too slow?

 

INT is the integrator. It's like a faster version of the BLM and more accurate. With our slower baud data rate it isn't very useful. Basically if the INT is pegged in one direction to an extream value then the BLM will change by one count. That's how it works.

 

About the O2 sensor,

It is a very sensetive around 5V. It will jump from 0.2V to 0.8V very fast. In closed loop the ECM does not try to keep the signal at 5V, it hunts for the voltage jump by increasing and decreasing fuel. The voltge should oscilate with 1Hz or even more. Basically it only measures rich / lean, not how rich / lean. To measure that you need a wideband O2 sensor.

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Jonas Bylund