Rebuilt AFM question

[chaseincats]

Hi guys, quick question.

Rockauto seems to have reman 5-pin AFMs in stock where the Canada spec one is half the price of the federal emissions (guessing that means USA) spec version.

Anyone know what is the mechanical difference between these?

 

[Zed Head]

You might find something in the FSM.  I'd guess that the Canada model runs richer at certain air flow and RPM ranges since the emissions regs were less stringent.  The Fed model would be lean for the catalytic converter.  Might be described in the Emissions chapter.  I see that Rockauto put the AFM's in Exhaust & Emission instead of Fuel & Air.  Odd, but might tell something.

https://www.rockauto.com/en/catalog/nissan,1980,280zx,2.8l+l6,1209316,exhaust+&+emission,mass+air+flow+(maf)+sensor,5128

[chaseincats]

9 hours ago, Zed Head said:

You might find something in the FSM.  I'd guess that the Canada model runs richer at certain air flow and RPM ranges since the emissions regs were less stringent.  The Fed model would be lean for the catalytic converter.  Might be described in the Emissions chapter.  I see that Rockauto put the AFM's in Exhaust & Emission instead of Fuel & Air.  Odd, but might tell something.

https://www.rockauto.com/en/catalog/nissan,1980,280zx,2.8l+l6,1209316,exhaust+&+emission,mass+air+flow+(maf)+sensor,5128

Gotcha, so it wouldn't be the spring tension that would be different, it would be the circuit board?

Edited January 9 by chaseincats