This is a question for myself, and for my friend with a 95 T/A.

I know that removing AIR on an OBD2 will set a SES. But what does it use to sense this? If the pump were hooked up and blowing air out into nowhere, would it know that it was not functioning?

Also, will removing AIR on my friend's OBD1 set a SES?

 

The 93-95's will not set an SES or a code for the missing AIR pump, as long as you have a good fuse in the circuit. The 96/97's have flow detector in each branch of the air tubes, I believe.

 

yup obd1 doesnt set a light on the AIR. Even if it is not even plugged up. THe EGR will set a code though.

Jason

 

its nothing to do with the flow in the tubes, since there isnt anything flowing in closed loop.

im thinking the pcm has to see a closed circuit for it not to set a SES, and when you open the circuit the light goes off.

 

That sounds right. For OBD2, either the PCM senses the closed circuit, or it senses the resistance of the air pump. Either way, it doesn't matter if its OBD1. I removed my air pump and let the connector hang and it hasn't set a code. I put a resistor in the connector for my EGR, though (which hasn't set a code BTW)

 

So if I leave the AIR pump plugged in on my 97, but not connected to the exhaust manifolds at all, wouldn't that keep the circuit closed and functioning? It could just pump air out into nothing.

I think Fred must be right about flow sensors because I think it would still set a SES somehow.

Mainly I want to get rid of all that stupid hard metal tubing that runs all over everywhere.

 

I think you could get rid everything (including the pump itself) and just put in a resistor. I used a 2.2k ohm resistor in my EGR harness and haven't thrown a code. I'm not sure though, cuase I have OBD1. Hopefully someone else with OBD2 will chime in, but it makes sense to me.

 

I removed the AIR and the EGR on my 94 and it has not set a code.
I left the fuse in for the AIR and I just pulled all the crap for the EGR and plugged the manifold vacuum port. No codes.