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Re: O2 sensor, does what, really? 200 1984

posted by  someone claiming to be abe crombie on  Wed Oct 21 16:46 CST 1998 [RELATED]

G, why do you think it is not in closed loop at idle?

The ECM has an additive algorithm for closed throttle switch, normal operating temp operation and a multiplicative algorithm for part load (open throttle switch but below a certain MAF sensor value on turbos). If you pull off a vac line while it idles (not too big of a hose, just a smallish leak) you will see the O2 sensor voltage go low for a period and then start to sweep to a higher voltage and then begin to rhythmically go high to low again after it has adapted.





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