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O2 sensors and IAC

Kinarfi

By Kinarfi
in Joyner UTV SxS Forum

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Kinarfi Veteran

Kinarfi

Posted
Posted

Checked my O2 sensors today, they were both good, Seimans VDO 5WY3173A with 7M12 stamped on the shoulder of the 22mm hex head.

Learned something I thought was interesting, when cold, the white lead for power measure about 6 ohms and the sensor lead measure open. If you power it up 12 volts, it draws 2 amps. As it was heating up, I was measuring resistance and saw the resistance go from open to zero to negative. That only happens when you are measuring a voltage with your meter on resistance.

The output appears to be a voltage from about .65 volts to - .025 depending on which way you hook up your leads.

On mine, when in free air or with air from my air compressor blowing on it, it measured -.025 volts, when I lowered into a can with gasoline in it, not into the gas, just above it, the voltage went to .65 volts, when I blew on it, it went close to 0 volts, when exposed to butane gas from a lighter, not lit, the voltage went from -.025 to about -.010, but I don't how much gas I was getting on it, shut have tried a lit lighter, but I didn't think to.

I have been having a tough time starting my Trooper, which is why I was checking the O2 sensors and I pulled the IAC and after cleaning it good, inside and out with brake cleaner fluid, I plugged it back and had my wife turn the key on while I watched the IAC. It ran and moved the "bullet" up so far that I couldn't put it back in. To get it back down, I had to squeeze it while my wife turned the key on and off several times, I could keep it from coming out any further, but couldn't get it to go back in until I opened the throttle and blocked it open. Then it backed off and I installed it.

After I got my Trooper running, warmed up, driven around some, and parked in the garage, I unplugged the IAC to see if it starts up OK after it cools and has set for a while. If it does, I'll cover the terminal and leave it that way.

Kinarfi

ricksrb Mentor

ricksrb

Posted
Posted

Checked my O2 sensors today, they were both good, Seimans VDO 5WY3173A with 7M12 stamped on the shoulder of the 22mm hex head.

Learned something I thought was interesting, when cold, the white lead for power measure about 6 ohms and the sensor lead measure open. If you power it up 12 volts, it draws 2 amps. As it was heating up, I was measuring resistance and saw the resistance go from open to zero to negative. That only happens when you are measuring a voltage with your meter on resistance.

The output appears to be a voltage from about .65 volts to - .025 depending on which way you hook up your leads.

On mine, when in free air or with air from my air compressor blowing on it, it measured -.025 volts, when I lowered into a can with gasoline in it, not into the gas, just above it, the voltage went to .65 volts, when I blew on it, it went close to 0 volts, when exposed to butane gas from a lighter, not lit, the voltage went from -.025 to about -.010, but I don't how much gas I was getting on it, shut have tried a lit lighter, but I didn't think to.

I have been having a tough time starting my Trooper, which is why I was checking the O2 sensors and I pulled the IAC and after cleaning it good, inside and out with brake cleaner fluid, I plugged it back and had my wife turn the key on while I watched the IAC. It ran and moved the "bullet" up so far that I couldn't put it back in. To get it back down, I had to squeeze it while my wife turned the key on and off several times, I could keep it from coming out any further, but couldn't get it to go back in until I opened the throttle and blocked it open. Then it backed off and I installed it.

After I got my Trooper running, warmed up, driven around some, and parked in the garage, I unplugged the IAC to see if it starts up OK after it cools and has set for a while. If it does, I'll cover the terminal and leave it that way.

Kinarfi

around here if you blow on it and it goes above .08 it means your above the legal limit(LOL)

jamesrulz Contributor

jamesrulz

Posted
Posted

Your 02 sensor should not cause hard starts because the computer should be in an open loop which means that the computer is using a pre programmed fuel map and not looking at the 02 sensors. Also your sensors need to be hot to be tested some people use a torch but you can hook up the 2 wires on the sensor that are used to pre heat the sensor with 12v to get the system into a closed loop quicker. My trooper used to start bad and surge at idle but it was because it went for a swim and the computer isnt sealed up at all. Anyway hope you find it

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