o2 Mass Airflow Sensor

[Oz]

I think I started that. Sorry.

No fault on your part. It was an easy mistake, but Gustavus titled the thread “O2 Mass Airflow Sensor”. The mass airflow sensor measures the volume of air at the intake and can contain PGM. The O2 sensor that is prior to the cat in the exhaust does indeed measure O2 (and contain PGM) giving that data to the computer to optimize combustion for the converter to be efficient. Sadly it is not used to optimize combustion for maximum fuel efficiency. To be clear, what Gustavus is processing is an O2 sensor in the exhaust stream.

 

[Anonymous]

I think I started that. Sorry.

They say a picture is worth a thousand words, I have posted many showing the o2 sensors.

Jimdoc caught it when he posted his assay results.

From an assay on oxygen sensors I got this info;
-Bosch/Kieffgo 4 wire 30 mg
-A/C 1 wire 40 mg
-Universal 1 wire 45 mg
-Bosch 1,(2or4 wire) 45 mg
-N/D 4 wire 60 mg
-N/D 1 wire 70 mg
-NTK 1 wire 80 mg
-NTK 4 wire 90 mg

Hope this helps if you didn't have this info already.


Jim

Tittle perhaps should have read - ( o2/Mass Airflow Sensors ).

As it stands was hoping someone one chime in on the lacking part of the subject line rather than attack - ouch.

 

[Barren Realms 007]

I think I started that. Sorry.

No fault on your part. It was an easy mistake, but Gustavus titled the thread “O2 Mass Airflow Sensor”. The mass airflow sensor measures the volume of air at the intake and can contain PGM. The O2 sensor that is prior to the cat in the exhaust does indeed measure O2 (and contain PGM) giving that data to the computer to optimize combustion for the converter to be efficient. Sadly it is not used to optimize combustion for maximum fuel efficiency. To be clear, what Gustavus is processing is an O2 sensor in the exhaust stream.

Yep I know the difference in the 2. I was in no way referring to the air flow sensor in my post but to the
O2 sensor that Gustavas had been discussing and showed in pictures.

Gustavas I don't see anything in the thread that indicates someone making an attack on you or your post.IMHO

 

[butcher]

good information on this thread keep up the good work. I would think the oxygen sensors should give higher yield than the mass air flow sensors, considering the enviroment they have to operate in, I cannot wait to see how this project continues, Gustavus I really enjoy your posts very interesting, I always seem to learn something.

 

[butcher]

there can be two to three oxygen sensors on a vehicle. there are about three types old style narrow range, and newer style wide range, this refers to the range they sense, these both contain platinum and zirconium dioxide ceramic, in the 90's they also had a titanium dioxide thick film narrow range sensor, no Idea any platinum there.

in any of these sensors it would be a good idea to watch for Rh, I am not sure if you will find any, but many sensors of other types can have it.

the oxygen sensors the oxygen sensor generates zero to five volts for the ECM computer, adjusting engine performance for emmision control and a good running engine the sensors also have a PTC heater, this is a positive temperature coefficient heater, testing them as temperature rises the resistance also rises, this is one way to test them put a torch to it and check the resistance change with temperature.

 

[Anonymous]

Pt drop from O2 sensors, this is my first PGM drop, your comments welcome.

Later this afternoon I'll make up some fresh stannous to check if my drop was complete or if there is any palladium in solution.

Best Regards
Gill

 

[Barren Realms 007]

Great job there. 8)

Isn't that the craked pot? :roll:

 

[lazersteve]

Gill,

Nice quantity of precipitate there.

The solution still looks dark green?

Did you include any iron or copper in the mix?

If not, you may not have removed all of the NOx and it's tied up some PGMs.

Steve

 

[qst42know]

Great job there. 8)

Isn't that the craked pot? :roll:

The cracked one was the upper of the double boiler rig he's using.

 

[Anonymous]

Gill,

Nice quantity of precipitate there.

The solution sutill looks dark green?

Did you include any iron or copper in the mix?

If not, you may not have removed all of the NOx and it's tied up some PGMs.

Steve

Yes your correct Steve there must have been some iron, after securing the orange powder boiled everything down again to be sure I had de-noxed properly then added more ammonium chloride with no further Pt drop.

Tested the remaining solution with fresh stannous and get a very slight color change, as far as I'm concerned it's stock pot fodder.

Best Regards
Gill

 

[Anonymous]

After letting the solution boiled twice that tested barren for Pt settled overnight found these red crystals, what am I doing wrong here.

Best Regards
Gill

 

[Harold_V]

Dissolve a tiny sample of the red crystal in water and test with either DMG or stannous chloride.

If you recall, Hoke instructs that the platinum metals do not fully precipitate, and if a solution is to dilute, they may not precipitate at all, and generally don't.

It is possible that what you're seeing is just a little more palladium that has precipitated with time. Testing will determine if that is correct, or not. I confess, I never experienced the same thing, but my usual procedure was to use a Buchner funnel and filter the material while it was still hot, immediately after precipitation.

In all my years of refining, I can recall only one instance of having experienced what I'd call a full precipitation. It came from a heavily concentrated batch.

How about posting the results of your test?

Harold

 

[Anonymous]

Dissolve a tiny sample of the red crystal in water and test with either DMG or stannous chloride.

If you recall, Hoke instructs that the platinum metals do not fully precipitate, and if a solution is to dilute, they may not precipitate at all, and generally don't.

It is possible that what you're seeing is just a little more palladium that has precipitated with time. Testing will determine if that is correct, or not. I confess, I never experienced the same thing, but my usual procedure was to use a Buchner funnel and filter the material while it was still hot, immediately after precipitation.

In all my years of refining, I can recall only one instance of having experienced what I'd call a full precipitation. It came from a heavily concentrated batch.

How about posting the results of your test?

Harold

Too late for that Harold the red crystals from the O2 Sensors Pt drop have been added to the stock pot. I may have overdone it with the ammonium chloride.

Best Regards
Gill

 

[Oz]

Frankly it looks like you precipitated some palladium in that last picture if my screen is showing the color correctly. Ammonium chloride will do that, but it is a slower reaction than the platinum. This is why many platinum precipitations are orange instead of the canary yellow.

 

[skippy]

Does anybody know if the heater rod on the oxygen sensors has anything worth bothering with in it? I just finished processing 60lbs of oxygen sensors and got a bit under ten grams of cemented platinum of unknown purity. I don't want to sound like a baby here, but really I was hoping for a little more, and I am wondering if I am missing any value if I just process the sensor nose.