ZUKIWORLD Online | Suzuki 4x4 Editorial and Forum
ZUKIWORLD Discussion Forum => Technical Discussion - Beginner / Repair => Topic started by: jow003 on June 15, 2010, 01:03:47 PM
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What are the symptoms of a bad o2 sensor?
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usually a check engine light, the vehicle may run poorly, or get poor fuel economy, theres a lot of symptoms from what I remember about this.
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My 96 got great mileage at around 40 mph, pretty lousy otherwise. And you could tell it was running rich most of the time, you could smell it in the exhaust.
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|removethispart|@ bob, my cluster is out of service, only thing that works on it is the bliker lights and the battery light which is on when ever power os going to it
|removethispart|@Drone, it seems like its running rich, i moved from ~70ft elevation to 6600. would the ECM and O2 sensor regulate that normally on a 87?
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I just remembered, there is a certain voltage range within which the O2 sensor should be. I dont know what range it is, but basically its easy to test with a multimeter.
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The ECM should adjust but it will take a while. Do you have an 87 Samurai? If so that is carburated, not ECM controlled.
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haha i keep getting different answers from ppl. yes its a 87 and carb'd. if i change out the o2 sensor, what else will i need to do?
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Carb's don't use an 02 sensor, I thought you were talking about a Sidekick. You probably just need to tune it for the higher altitude.
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Carb's don't use an 02 sensor, I thought you were talking about a Sidekick. You probably just need to tune it for the higher altitude.
If I'm not mistaken the 87 Samurai has a "feedback carburetor" which does use an O2 sensor and a very primitive ECU - since this is not fuel injected, there are no injectors and the ECU pulses a mixture control solenoid valve that adjusts the mixture based on feedback from the O2 sensor - unfortunately I have no idea how altitude affects this setup.
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do you know a place that would? i have been told that a MY-Side setup is the way to go but if i can make it work with what i have id rather save the money
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If I'm not mistaken the 87 Samurai has a "feedback carburetor" which does use an O2 sensor and a very primitive ECU - since this is not fuel injected, there are no injectors and the ECU pulses a mixture control solenoid valve that adjusts the mixture based on feedback from the O2 sensor - unfortunately I have no idea how altitude affects this setup.
You might be right, looking at the wiring diagram there is a spot for an 02 sensor. I must have overlooked it when I was checking out the wiring diagram earlier.
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-Drone, how do i go about tuning it? and what diagram were you looking at?
-Fordem, how would i check to see if the sensor is bad or if that is my setup?
thank you all for the help
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so... did sommore research and found that carb'd samurais have a High Altitude Controller (HAC) its supposed to be switched one way if you are below 4K feet in elevation and switched the other if you are above. only problem is the chilton book i have is a POS, go figure and doesnt really do a great job of explaining if its good or bad. i think this is it tho, correct me if im wrong.
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jow003: I pulled the info from Acks Faq wiring diagram at http://www.acksfaq.com/ewd_86-89_g13_carb.htm (http://www.acksfaq.com/ewd_86-89_g13_carb.htm)
You might try reading up on the Factory Service Manual. You can find one over at http://www.suzukiinfo.com/ (http://www.suzukiinfo.com/)
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I just remembered, there is a certain voltage range within which the O2 sensor should be. I dont know what range it is, but basically its easy to test with a multimeter.
It is from .2 to .8 volts (notice the decimal in front of the numbers).
Carb's don't use an 02 sensor
Umm, all samurais had an O2 sensor.
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so... did sommore research and found that carb'd samurais have a High Altitude Controller (HAC) its supposed to be switched one way if you are below 4K feet in elevation and switched the other if you are above. only problem is the chilton book i have is a POS, go figure and doesnt really do a great job of explaining if its good or bad. i think this is it tho, correct me if im wrong.
Yes, that is the High Altitude Compensator.
The FSM should give you more info on that part than the Chilton or Haynes manuals.
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you got one you'd like to sell ???
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Carb's don't use an 02 sensor
Umm, all samurais had an O2 sensor.
Umm, that's not 100% correct - maybe all US Samurais have an O2 sensor, but out where I am, Samurais generally don't have O2 sensors. As a matter of fact, I also have a Grand Vitara with no O2 sensor(s), and yes it is fuel injected.
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Carb's don't use an 02 sensor
Umm, all samurais had an O2 sensor.
Umm, that's not 100% correct - maybe all US Samurais have an O2 sensor, but out where I am, Samurais generally don't have O2 sensors. As a matter of fact, I also have a Grand Vitara with no O2 sensor(s), and yes it is fuel injected.
Yes, I was referring to US samurais.
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does anyone know how to change the HAC or check the 02 sensor to see if its good?
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does anyone know how to change the HAC or check the 02 sensor to see if its good?
HAC....unplug it and plug a new one in.
O2 sensor....I believe the FSM has the checking procedure in it.
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next question how does the HAC come apart? i dont wanna break it and i dont know if it unscrews or just pulls out (the top from the bottom)
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next question how does the HAC come apart? i dont wanna break it and i dont know if it unscrews or just pulls out (the top from the bottom)
Unbolt it from the firewall, unplug the pigtail from the harness. You don't take the HAC apart. Don't make it harder than it is. ;)
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ooookkkkk. haha i was thinkin i kept some part of the housing but replaced somthing inside or ... i dunno