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Old 05-15-2011, 01:03 PM   #1 (permalink)
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Default 94 samurai o2 sensor

a calmini exhaust header & hi flow system was put on this samurai , that i had bought a month ago. my questions are i can not find the main plug for the o2 sensor, may have been cut or pulled off? no plug there, i know what plug looks like, none to be found? so what color wire should i look for, and also is this a heated o2 sonsor ? i feel this would affect how well it would run!! thanx in advance for all help and advice!!
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Old 05-15-2011, 03:39 PM   #2 (permalink)
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What is your location? some markets don't have an O2 sensor fitted. Do you have a Check Engine Light on? if not does it come on when you turn the ignition on?
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Old 05-15-2011, 04:16 PM   #3 (permalink)
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In the wiring harness running along the top of inner fender on the drivers side there should be a large blue wire. That's it. Mine changes to a smaller red wire as it enters the plug.
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Old 05-15-2011, 04:21 PM   #4 (permalink)
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i am in PA. right now the motor is out being rebuilt, prev owner put reman motor in got off ebay from AZ , and after 250 miles i pulled out for bad blow by, found rings broke but cylinder walls looked great there is black tape over lights on dash , just getting ducks in row for engine return!
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Old 05-15-2011, 04:35 PM   #5 (permalink)
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thanx hey zook 4x4 i will look on monday can you tell me if the o2 sensor is heated or not
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Old 05-15-2011, 06:43 PM   #6 (permalink)
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Being heated I have no idea. All I know is there is just the one wire at the sensor. After looking up Bosch universal o2 sensors one wire looks to be non heated.

Last edited by zooki4x4; 05-15-2011 at 07:12 PM.
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Old 05-15-2011, 07:35 PM   #7 (permalink)
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thanx zook 4x4 for all your help i will let you know how i make out
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Old 05-16-2011, 11:39 AM   #8 (permalink)
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Quote:
... [is] the O2 sensor is heated...
One-wire, unheated.
Common to MANY other vehicles of that era.
Takes a 22mm (pref) or 7/8 wrench. (The metric size fits better/tighter. )
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Old 05-16-2011, 08:05 PM   #9 (permalink)
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thanx zooki 4x4 & merlin 93 , the wire was on driver side top of inner fender and a red wire like u said zooki 4x4 . merlin93 if not heated what does the ecm read from the o2 senser then
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Old 05-17-2011, 01:46 AM   #10 (permalink)
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The O2 sensor outputs a small voltage, less than 1 volt, that is proportional to the air/fuel ratio. Rich mixtures read higher, and lean mixtures run lower, with stochiometric (properly balanced) being just under one-half volt. The sensor needs to be hot to work properly, which is one reason that heated sensors are used nowadays. There's a huge amount of information available by googling. Although an electrical engineer, I'm not very knowledgeable about O2 sensors. My Zuk ran better, and passed smog in Calif. with more margin, after I replaced mine at about 15 years & 100K miles.
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