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- From: pwu@tang.ai.mit.edu (Peng Wu)
- Newsgroups: rec.autos.tech
- Subject: Re: oxygen sensor
- Message-ID: <29194@life.ai.mit.edu>
- Date: 13 Oct 92 05:11:30 GMT
- References: <1992Oct7.210906.18481@cabot.balltown.cma.COM> <BvvHJJ.9qK@ssesco.com> <1992Oct11.203434.27766@magnus.acs.ohio-state.edu> <Bw0IKw.Jw@ssesco.com>
- Sender: news@ai.mit.edu
- Lines: 19
- In-reply-to: elmquist@pez.ssesco.com's message of 12 Oct 92 14:22:07 GMT
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- ***
- Mine (my engine) seems to misbehave more before it is fully warmed but
- after it has stepped the idle down from the higher speed cold idle. It
- is during this warmup phase that it runs the worst. What kind of O2
- sensor output would be expected by the computer during this time...? is
- the computer even looking at the O2 sensor then ?
-
- If your car has a three-wire O2 sensor, it should not get cold after warmed up. If
- your car has an one-wire sensor, read on...
-
- On a Topaz/Tempo, the computer checks if the O2 sensor (one-wire) switches
- between lean and rich. If not, the computer will assume the sensor is cold
- and switch to "open loop" mode, i.e., ignoring the O2 sensor. This is
- supposedly the situation when the car is left idling for long. I think it is
- also the case when the car is just started. The computer also ignores the O2
- sensor during wide open throttle. If your car has a one-wire O2 sensor and
- your car's computer is supposed to do the same, you might want to look for
- something else.
-