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Today I decided to test my o2 sensors on my 1996 chevy k1500 to my knowledge the o2 sensors have never been replaced. I used my Haynes manual to test one of the sensors. It was supposed to have between .1 and .9 volts however I could only get .01-.06 I had my volt meter set to 20 and I also tried the mili volts and came out with the same numbers. I then tried unplugging the sensor and testing off the prongs that matched the two wires and came with the same numbers.
Also, I have a scan guage two that can tell me what the o2 sensors are reading and all the sensors seem to me all over the place. I do know that my bank1 cat is coming apart.
The truck seems to run pretty good for the most part there does seem to be a slight struggle going from say 55 to 65mph or on a hill it kills my mileage down to about 8 mpg but its a hill but on the low end it seems fine and has tons of power and regular driving I can get 16-19 mpg.
What are your thoughts?
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.1-.9V and .01-.06V is the same thing the 0 behind means nothing your O2 sensor appears to be normal and operating properly O2 sensors have 4 wires 2 for the heater in the sensor and 2 for the sensor itself. This could mean that the sensors getting the voltage but the heater side dont work which is the most common issue try replacing the sensor(s) that do not get a consistant reading. numbers all over the place generally means the its a bad sensor or a wiring problem check the sensor(s) in ohms not volts
possibly im acustomed to dealing with whole voltages. when you want to test sensors you want to test it in ohms and then check the resistance its easier that way
[quote=”Passey” post=56049]Wouldn’t .1 be one/tenth a volt and .01 be one/hundredth of a volt?[/quote]
Well and the other thing is I can beat on that catalytic converter and it rattles but I don’t have a chek engine light.
What does the scan tool show for the O2 sensors? They are not going to stay steady they will fluctuate constantly. I have never tried to check an O2 sensor output with a volt meter, it may not be able to keep up with how fast the voltage changes.
[quote=”Passey” post=56058]Well and the other thing is I can beat on that catalytic converter and it rattles but I don’t have a chek engine light.[/quote]
ive never beat on a cat to know if its suppose to rattle. Now since a cat is not a part that will trip the CEL (its the O2 sensors that do that) the only way to tell the cat is the issue without removing it completely is unplug the O2 sensors and drive you might get a CEL due to the disconnected sensors but based on how it drives you should beable to tell it its a clogged up cat or bad sensors. if the results are the same thing than try removing the cat and take it on a drive it will be loud since the muffler is no longer connected but it will help further to test the cat. you will gain between 5-10 HP just by removing the cat alone. Also if you have a belt fan remove it and replace it wit an electric fan its simple to wire up just run a switch into the cab and mount it somewhere and have the negitive wire of the fan goto the switch and then hook the positive directly to the battery than hook the other side of the switch to any ground connection and you have a power electric fan. This will give you a few HP and i bit of a MPG increase. as far as WHEN to turn on the fan that is your discression if you wanted it switchless hook the negitive wire of the fan to the battery or other ground and wire the positive to the ignition system so when you start the car the fan automatically runs and shuts off with it.
You can remove the O2 sensors behind the cat converters and drive it that will tell you if the cats are stopped up. But if you hit on them and here rattle inside then they have broken apart. They are not supposed to rattle. If you do away with the converters, by the way this is illegal and you will fail emissions test, you will have a check engine light on unless you can get rear O2 sensor delete kits for your truck. all the rear O2 sensors are for is to tell the computer if the cats are working.
I am sorry I ment to say remove the front ones, not the rear ones. If they are stopped up removing the front o2 sensors will give the exhaust somewhere to go.
if you dont have emissions testing in your neck of the woods you can rip out the cats you will gain HP and MPG by doing so but dont ever take it to a shop by law they have to install them so if you are limited on cars like i am then dont rip em out
Well I just did a 0-60 run on it and it didn’t want to go past about 52 I could make it go 60 but it didn’t want to and it took about 14 seconds (give or take a second or two it was a pretty rough run) new land speed record there!!! Lol but I don’t know what would be normal for a 350 vortec
From what I have been reading that’s terrible for my truck it should be around 9 or ten I guess but it still dont seem right
if speed is where your issue is maybe the issue resides in the transmission i assume you have a column shifter so check the linkage cable it could be loose preventing the tranny from fully going into gear. You could have a throttle cable issue check its slack and tighten it if its too loose. Also if you have a Cable operated Ebrake check that cables linkages and make sure its not too tight (slightly applying the ebrake and not registering it is on the dash)
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