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- From: elmquist@pez.ssesco.com (Chris Elmquist)
- Subject: Re: oxygen sensor
- Message-ID: <Bw0IKw.Jw@ssesco.com>
- Sender: news@ssesco.com
- Organization: SSESCO
- References: <1992Oct7.210906.18481@cabot.balltown.cma.COM> <BvvHJJ.9qK@ssesco.com> <1992Oct11.203434.27766@magnus.acs.ohio-state.edu>
- Date: Mon, 12 Oct 1992 14:22:07 GMT
- Lines: 38
-
- In article <1992Oct11.203434.27766@magnus.acs.ohio-state.edu> chohan@magnus.acs.ohio-state.edu (Harpal Chohan) writes:
- >In article <BvvHJJ.9qK@ssesco.com> elmquist@pez.ssesco.com (Chris Elmquist) writes:
- >>
- >>I'm wondering if I can disconnect the sensor and fake a nominal Vout
- >>using a battery and a couple resistors (or a pot)... If they have a 0v
- >>to 1v range, can I feed .5v say, into the computer in place of the O2 sensor
- >>and see if the idle behaves differently (better maybe) ? Or is the output
- >
- >Wouldn't feeding the ECU 0.5V fool it into believing the mixture is
- >optimum already, which might not be the case? I believe Richard's
- >suggestion of grounding the wire is probably a more stable test.
-
- yes.. that makes more sense...
-
- >
- >>It would be nice to diagnosis the O2 sensor as bad before trying to pull
- >>it out...
- >
- >You can hook a voltmeter to its output and observe how fast it reacts
- >when hot. Should fluctuate between 0.4 to 0.7 V at a fairly brisk
- >rate. Introduce unmeasured air into the system by pulling the dipstick
- >or the oil filler cap, and see if the voltage drops immediately. Sluggish,
- >or no response, should be fairly indicative of a non-functioning sensor.
-
- So, the more O2, the lower the voltage out from the sensor ? Or visa-versa ?
-
- 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 ?
-
- Chris
-
- Chris Elmquist, N0JCF
- elmquist@SSESCO.com
- 73267.2711@Compuserve.com
- (612)342-0003@work (8am-5pm CST6CDT)
-