When in closed loop, the O2 voltages will cycle rapidly from .1-.8 volts .
If you have a A/F gauge, you will be able to tell with ease. If not, you can use a DVOM hooked up to the signal wire of either upsteam 02. Really though, you need to have at least a basic A/F gauge, or you should just leave it alone...
To mod the MAF, you just need to remove the four screws on the MAF the hold the honeycombs in, and gently tap out the two side and one lower HC out. You leave in the large center HC.
Use the smooth back of the screwdriver to tap the HC's out. Don't hit them hard. A gentle tap will work without damaging them.
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