AIR/Smog Pump about to go?
 

I have another thread going on "strange cold starts" where after the cold start the RPM's drop to 800 briefly then go back to 1100-1200 for cold idle (issue started 2 years ago). I still have this issue and just recently noticed the dash lights "dim" a little right when the RPM's drop to 800, the same time I hear the AIR pump turn on.

Now here's the strange thing -- I never blew a fuse for the AIR pump nor did I ever get a SES light. Other than the RPM drop, I don't hear anything abnormal (the AIR pump still has that hi-pitch whine). Also on a "cold engine" if I turn the key (without starting), I hear the fuel pump prime followed by a slight "pop" and then turn off the key I do not hear a "whistle" (like I do when I turn it off on a "warm engine"). I did have that AIR pump recall done back in late 2000 (supposed to prevent corrosion or something).

I guess I can try replacing the underhood relay to see if that fixes the issue but I have a feeling I may need to replace the actual pump. Does anyone know the part# and where I can find one (if it has to be AC Delco, because I know I can get remanufactured units from Advance or Autozone)?

My lights dim and come back immediately when the pump kicks on too but the rpm's don't drop. I think its just the initial draw when the pump kicks on

Delete it, problem solved.

Would've done that....but mine's a 97 with OBD2 so unfortunately that's not an option for me (I know it can be tuned out so the light won't turn on, but I still need to pass emissions).

It only works on a cold start anyway. If you delete it and have it removed in the tune you will be fine. They don't even open the hood on OBDII cars. And I doubt they know what to look for anyway. The only thing they are looking for with the cameras is cats

The beauty of obd2 is a good tuner can tune so can pass emissions

If a good tuner is someone who can check and uncheck boxes, well that is just a silly statement.

You could just do a PCM4less tune

Does anyone know what the "pop" noise is after I turn the key? I hear it right after the fuel pump prime on a cold engine (when I turn the key to ON position but don't start engine).

Wondering if that's related to my strange cold startup (I don't hear the pop on a warm engine). Although today I did hear the AIR pump kick in after starting a warm engine (no rpm drop however)...

isnt it more involved than just checking boxes off for obd2? Mine being obd1 i gotta be friends with the shop to pass

No.

So you dont havd to mess with the scales for egr and that, just uncheck engine light codes?

Yeah pretty much. Its the software that's pricey

Get HPTuners or find someone with it and see for yourself. Hell, google it.

I know mine i unchecked the boxes and messed with the scolar scale for the egr and air pump.

OBD1 cars have to pass the sniffer test. OBD2 cars do not. so OP shall be fine since he is OBD2 (96+)

He is a 97, which means, OBD2 last time I checked.

So, readiness tests.

:bertstare:

oopsies, thought I quoted dudbird. I shall edit.

but yes, OP is fine as long as you get your ECU tuned to say EGR and AIR are always ready lol