Lazy O2 sensor?
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Joined: Nov 2001
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From: St Louis, MO
Lazy O2 sensor? I've got a few logs of my car warming up and noticed my B1 sensor looks a bit peculiar. It looks ok when warmed up, but takes quite a bit longer to start switching than the B2 sensor.
My LTFT B1 is also consistantly 3 points higher than B2. Think its worth changing them? I have 36k miles.
Eric
My LTFT B1 is also consistantly 3 points higher than B2. Think its worth changing them? I have 36k miles.
Eric
Re: Lazy O2 sensor? If it's switching OK, then it's not really 'lazy', but it sounds like replacing it wouldn't hurt.
A 'lazy' O2 will switch, but it will do so *very* slowly. It'll wander down below 450, then it'll creep up over 450, then back down.
You running headers? Any exhaust leaks?
Probably not a 'replace it now' item, but you might plan on it one Saturday. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Cheers,
Andrew
A 'lazy' O2 will switch, but it will do so *very* slowly. It'll wander down below 450, then it'll creep up over 450, then back down.
You running headers? Any exhaust leaks?
Probably not a 'replace it now' item, but you might plan on it one Saturday. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Cheers,
Andrew
Re: Lazy O2 sensor? Heater should make it pop right up.
A "slow" sensor can make for sluggish
performance especially if you're off
in your open-loop tune for wherever
you're running; it's not just the
slowness in initial warmup, but the
latency in reporting any change in
operating point that attends any
transient throttle / load change. I've
seen older cars improve nicely in their
"drive appeal" when replacing slow-
switching, wide-swinging sensors with
fresh. In general I've gotten onto this
because of idle problems (hunting during
warmup) but it has benefits in any closed
loop region.
In my opinion, anything that appears
abnormal should be replaced (and its
buddy, too, pairwise).
A "slow" sensor can make for sluggish
performance especially if you're off
in your open-loop tune for wherever
you're running; it's not just the
slowness in initial warmup, but the
latency in reporting any change in
operating point that attends any
transient throttle / load change. I've
seen older cars improve nicely in their
"drive appeal" when replacing slow-
switching, wide-swinging sensors with
fresh. In general I've gotten onto this
because of idle problems (hunting during
warmup) but it has benefits in any closed
loop region.
In my opinion, anything that appears
abnormal should be replaced (and its
buddy, too, pairwise).
