O2 readings

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08-17-2014, 01:33 PM

htrdbmr

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Car: BMW 735

Engine: 383 W/ SUPERAM

Transmission: 700R4

Axle/Gears: 3.64

O2 readings

Why am I seeing my O2 voltages vary from 150 to 850mV when I'm going down the road at constant speed, closed loop, and constant 128 blm. Is this normal?

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08-17-2014, 02:00 PM

RBob

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Re: O2 readings

Yes, it is normal in closed loop. The ECM forces the AFR to oscillate in order to average the reading.

RBob.

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08-17-2014, 08:20 PM

htrdbmr

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Car: BMW 735

Engine: 383 W/ SUPERAM

Transmission: 700R4

Axle/Gears: 3.64

Re: O2 readings

Quote:

Originally Posted by RBob

Yes, it is normal in closed loop. The ECM forces the AFR to oscillate in order to average the reading.

RBob.

Thanks. I saw the injector pulse width changing, and I thought the O2 was driving it.

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