Obin, just use a voltmeter with your O2 sensor, as was mentioned earlier. The schematics and details are in a tech article on the pelican board (I don't know if it is still there)
The bottom line is that you want the voltage to oscillate between .2 and .8 volts continuously after it warms up. If it exceeds either limit, then you need to fiddle with the MAF to fix it.
Good luck.
E
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