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O2 readings

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Old Aug 17, 2014 | 01:33 PM
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htrdbmr's Avatar
htrdbmr
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From: APOLLO BEACH FLA
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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Old Aug 17, 2014 | 02:00 PM
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RBob
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
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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Old Aug 17, 2014 | 08:20 PM
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htrdbmr
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Junior Member
10 Year Member
 
Joined: Jul 2014
Posts: 84
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From: APOLLO BEACH FLA
Car: BMW 735
Engine: 383 W/ SUPERAM
Transmission: 700R4
Axle/Gears: 3.64
Re: O2 readings
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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