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Originally Posted by mbtoloczko
The LM-1 has an input signal resolution of ~0.005 volts, and it acquires data at a rate of about 12 times per second. The manual doesn't say how long it reads the signals. I'm reading the MAF signal where it enters the ECU. I'm using a ground wire on the ECU as the voltage reference. I'd guess that the MAF voltage oscilliations are real. Seems to be happening at higher air flow rates. Maybe turbulence in the MAF? Maybe something to do with the MAF response time?
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Well if those are real then there is the explanation of the afr going screwy at high flow rates. A half volt is a lot anywhere but because it's at the top end of the curve that half volt oscilation in voltage is a huge fluctuation in the load reading--25%-30% accross the range where it's happening.