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Well I found my old notes, they came from Autozone of all places. They have a real nice write up on testing O2 seonsors for 1984 to 1998 Jeeps! It is very useful info that I have not found elsewhere:
http://www.autozone.com/servlet/UiBroker?ForwardPage=az/cds/en_us/0900823d/80/15/22/9d/0900823d8015229d.jsp
BUT, According to page 1, Low volatge is low O2, which is rich fuel mix, and high voltage is lean fuel, high O2.
BUT page 2 says the opposite, it says pull a vacuum hose after the throttle body, voltage should drop to apx 0.12 volts due to a lean mixture, but doing that should create a high O2 (which is lean fuel) reading which page one says should read high volatge, so they can't both be right.
It also says "and using a propane enrichment tool it should jump to 0.9 volts."
So now I am wondering which is right, page 1 or page 2?
Either way this is a great way for us to test those O2 sensors with a voltmeter (analog meters work best on this test!) that we have had questions about from time to time as it says a rapidly swinging signal is a sign of a working O2 sensor and a stuck signal means a bad sensor. The test procedure at the link site also details some other problems the voltage readings can confirm!
Mine drops to about .2 volts for 4 seconds during rapid deceleration from 3500 rpm to 700 rpm (in Park). Other than that (i have not tried a propane tool) it runs from 0.33 to 0.77 volts at idle up to about 3500 rpm, and it takes about 1 second to swing from one side to the other, or 2 seconds to go full cycle from high to low and back to high. I used a Radio Shack analog FET Multimeter (one of the really good ones).
Any body ever confirmed which one of those is right, page 1 or 2? Anyone got a propane tool and analog meter handy?
Last minute edit, this site has some good info as well, it says page 2 is right:
http://www.ibmwr.org/ktech/O2-sensor-testing.shtml
This one says page 1 is right!
http://www.mr2.com/TEXT/O2_Sensor.html
Ecomike
http://www.autozone.com/servlet/UiBroker?ForwardPage=az/cds/en_us/0900823d/80/15/22/9d/0900823d8015229d.jsp
BUT, According to page 1, Low volatge is low O2, which is rich fuel mix, and high voltage is lean fuel, high O2.
BUT page 2 says the opposite, it says pull a vacuum hose after the throttle body, voltage should drop to apx 0.12 volts due to a lean mixture, but doing that should create a high O2 (which is lean fuel) reading which page one says should read high volatge, so they can't both be right.
It also says "and using a propane enrichment tool it should jump to 0.9 volts."
So now I am wondering which is right, page 1 or page 2?
Either way this is a great way for us to test those O2 sensors with a voltmeter (analog meters work best on this test!) that we have had questions about from time to time as it says a rapidly swinging signal is a sign of a working O2 sensor and a stuck signal means a bad sensor. The test procedure at the link site also details some other problems the voltage readings can confirm!
Mine drops to about .2 volts for 4 seconds during rapid deceleration from 3500 rpm to 700 rpm (in Park). Other than that (i have not tried a propane tool) it runs from 0.33 to 0.77 volts at idle up to about 3500 rpm, and it takes about 1 second to swing from one side to the other, or 2 seconds to go full cycle from high to low and back to high. I used a Radio Shack analog FET Multimeter (one of the really good ones).
Any body ever confirmed which one of those is right, page 1 or 2? Anyone got a propane tool and analog meter handy?
Last minute edit, this site has some good info as well, it says page 2 is right:
http://www.ibmwr.org/ktech/O2-sensor-testing.shtml
This one says page 1 is right!
http://www.mr2.com/TEXT/O2_Sensor.html
Ecomike
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