How To Test Heated 02 Sensor
Pro
Joined: Mar 2000
Posts: 658
Likes: 7
From: Perth Amboy New Jersey
Jake,
The sensor must be heated to be tested , there is no chart that shows a temperature vs millivolts format.
http://www.autotap.com/articles/Unde...n_Sensors.html
yedi
The sensor must be heated to be tested , there is no chart that shows a temperature vs millivolts format.
http://www.autotap.com/articles/Unde...n_Sensors.html
yedi
Burning Brakes
Joined: Nov 2000
Posts: 810
Likes: 3
From: Austria
try this: ( its the way i test it)
connect a voltmeter to the o2, then heat it up with a propane torch...
if you bring the measuring tip of the o2 in the outer, light blue cone of the flame, it should read low millivolts (lean) if you bring it in the dark blue cone of the flame high millivolts(rich)...
this works for me and is a rough estimate if it works or not..
on a heated o2 you can try this just letting propane from the torch on the tip ( without burning)
connect a voltmeter to the o2, then heat it up with a propane torch...
if you bring the measuring tip of the o2 in the outer, light blue cone of the flame, it should read low millivolts (lean) if you bring it in the dark blue cone of the flame high millivolts(rich)...
this works for me and is a rough estimate if it works or not..
on a heated o2 you can try this just letting propane from the torch on the tip ( without burning)
Thread Starter
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Originally Posted by yedister
Jake,
The sensor must be heated to be tested , there is no chart that shows a temperature vs millivolts format.
http://www.autotap.com/articles/Unde...n_Sensors.html
yedi
The sensor must be heated to be tested , there is no chart that shows a temperature vs millivolts format.
http://www.autotap.com/articles/Unde...n_Sensors.html
yedi
It told me to check the activity of the 02 from .1 to .9 mV but since the laptop died, I haven't been able to run Diacom to see what the stupid thing is doing.
Had a funky idle start all of a sudden, so I suspected it was the heated 02, so I pulled it and installed a non-heated one that I had in the garage and the idle went back to normal.
So now is suspect the heated 02 gave up the ghost, but I wanted to check it before buying another one.
Jake
Thread Starter
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Originally Posted by corvette90
try this: ( its the way i test it)
connect a voltmeter to the o2, then heat it up with a propane torch...
if you bring the measuring tip of the o2 in the outer, light blue cone of the flame, it should read low millivolts (lean) if you bring it in the dark blue cone of the flame high millivolts(rich)...
this works for me and is a rough estimate if it works or not..
on a heated o2 you can try this just letting propane from the torch on the tip ( without burning)
connect a voltmeter to the o2, then heat it up with a propane torch...
if you bring the measuring tip of the o2 in the outer, light blue cone of the flame, it should read low millivolts (lean) if you bring it in the dark blue cone of the flame high millivolts(rich)...
this works for me and is a rough estimate if it works or not..
on a heated o2 you can try this just letting propane from the torch on the tip ( without burning)
If I use the propane trick, I'll have to send 12 volts to the 02 through the two white wires and get my DVM reading from the brown wire and ground, right?
Jake
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Thread Starter
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Well, here's an update:
I attached 12 volts to the 02 and after several seconds, the tip began to heat up. After a a minute or so it became so hot I couldn't keep my finger on it.
I left it that way for a long while and the tip remained hot, so I'm convinced the heating element is working.
I then connected a volt meter to the brown wire and saw constantly changing mV readings. When I placed the flame of a cigarette lighter (outta propane) near the tip of the 02, the voltage readings began to rise. When I moved the flame away, the readings dropped.
So based on all that, I'm now almost convinced that the thing is working okay and the idle hiccup may have been caused by something else.
Idle has been fine since I swapped in an un-heated 02 that I had laying around. But just to get to the bottom of this, I plan to re-install the heated 02, check all the wiring connections again and see if the idle hiccup recurs.
Thanks for the advice; I'll post the results.
Jake
I attached 12 volts to the 02 and after several seconds, the tip began to heat up. After a a minute or so it became so hot I couldn't keep my finger on it.
I left it that way for a long while and the tip remained hot, so I'm convinced the heating element is working.
I then connected a volt meter to the brown wire and saw constantly changing mV readings. When I placed the flame of a cigarette lighter (outta propane) near the tip of the 02, the voltage readings began to rise. When I moved the flame away, the readings dropped.
So based on all that, I'm now almost convinced that the thing is working okay and the idle hiccup may have been caused by something else.
Idle has been fine since I swapped in an un-heated 02 that I had laying around. But just to get to the bottom of this, I plan to re-install the heated 02, check all the wiring connections again and see if the idle hiccup recurs.
Thanks for the advice; I'll post the results.
Jake
Last edited by JAKE; Sep 25, 2004 at 10:35 AM.
Thread Starter
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Well, now I know for sure.
Re-installed the heated 02 and checked all the connections.
Fired the engine and it seemed to idle fine, AT FIRST. then the surging began again and I got a Code 44, Lean Exhaust Mixture.
So, having run the stock UNHEATED 02 for a few days with no code or idle problem, I now know I need a new 02.
So I'm headed to O'Reilly's and AutoZone now to try to find a new heated 02, Bosch #13190..
Jake
Re-installed the heated 02 and checked all the connections.
Fired the engine and it seemed to idle fine, AT FIRST. then the surging began again and I got a Code 44, Lean Exhaust Mixture.
So, having run the stock UNHEATED 02 for a few days with no code or idle problem, I now know I need a new 02.
So I'm headed to O'Reilly's and AutoZone now to try to find a new heated 02, Bosch #13190..
Jake
Thread Starter
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
O'Reilly's wanted over $100 for a heated 02, which is too rich for my blood. O'Reilly's did cross-reference my part number and found out what other year/model cars the heated 02 comes on.
I found that heated 02s come on 85 GM cars with a V6 and engine code "Z", so I plan to hit the wrecking yard to see what I can come up with.
Bet I can get one for about $15.00 there.
Jake
I found that heated 02s come on 85 GM cars with a V6 and engine code "Z", so I plan to hit the wrecking yard to see what I can come up with.
Bet I can get one for about $15.00 there.
Jake
Team Owner
Joined: Jul 2004
Posts: 28,353
Likes: 3,253
From: Hartford WI
Sounds like you have a failing O2 sensor. When they fail, the problem is that more often than not, thdy don't stop working. They just get "lazy" and they do move up and down but just slowly. That causes the wierd idle in your car.
I would not go with a JY unit simply because you do not know if it is in better shape than the one you have. Wouldn't a generic Bosch one work just as well and be cheaper?
I would not go with a JY unit simply because you do not know if it is in better shape than the one you have. Wouldn't a generic Bosch one work just as well and be cheaper?
