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that's my story and I'm sticking to it.
Posted by JohnB (more from JohnB) on Tue, 25 Oct 2005 07:39:39
In Reply to: O2 follow up questions for Anders , Ari , John B & all, John Daikh, Tue, 25 Oct 2005 00:33:24
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Hopefully you didn't test the 02 sensor with an ohmmeter while it was in circuit with the ECU.
OTOH, the literature says don't test it outside the control circuit with an ohmmeter.
That being said, I cannot disagree with M. Anders that it shouldn't damage the 02 sensor (all I said was the literature says it will).
I bought a (relatively) inexpensive scanning multimeter that behaves like an oscilloscope in that it can graph/display a voltage/time signal. IIRC it was under $200 USD. It reasonably accurately displays the 02 signal..you just backprobe the sensor at the connector (leave it hooked to the ecu). You're looking for 5-6 crossovers/second (run the engine up to 1500-2000 rpm and give the sensor 10-20 seconds to heat up...it should oscillate like crazy between .2 and .7 or so volts. If you're only getting one or two crossovers per second you may have a 'lazy' or worn or contaminated 02 sensor.
You can lean the mixture by unclipping an injector lead...the reading will go toward .2v until the ecu increases the other cylinders. Then jack up the fpr by lightly clamping the fpr return line...the fuel pressure goes up and the mixture should go rich....if neither of these tests work, you generally have a bad 02 sensor.
posted by 140.185.5...
Posts in this Thread:
- O2 follow up questions for Anders , Ari , John B & all, John Daikh, Tue, 25 Oct 2005 00:33:24
- Yet another chime in, Ari , Tue, 25 Oct 2005 09:30:45
- that's my story and I'm sticking to it., JohnB, Tue, 25 Oct 2005 07:39:39 <-- Viewing This Message
- Re: O2 follow up questions for Anders , Ari , John B & all, JimBlake , Tue, 25 Oct 2005 06:52:31
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