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Discussion Starter #1 (Edited)
EDIT: Thanks for all your help, I suspect the check valve is bad or leaking because I have horrible gas mileage. Both the o2 sensors are fairly new and are both working properly. I'll see how it goes but thanks everyone.

I have a 1994 Pontiac Firebird Formula 5.7L 6-speed manual trans

My ses light is on, I got code 29 from it which has to do with the air pump.

Does anybody know which pins on the harness to check for voltage? The air pump is kinda expensive so I'd like to make sure that's what it is before I replace it.

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first thing i'd check is the relay. you can swap it with one of your fan relays temporarily; they're the same.

i'd be tempted to just delete the AIR pump instead of replace it, for what it's worth. it's really just there to help your cats warm up faster.
 

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Discussion Starter #3
first thing i'd check is the relay. you can swap it with one of your fan relays temporarily; they're the same.

i'd be tempted to just delete the AIR pump instead of replace it, for what it's worth. it's really just there to help your cats warm up faster.
I just checked the relay, relay is good. I even plugged the air pump relay into the cooling fan slot and confirmed it comes on.

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