Smog pump bypass?

PvolkStang

New Member
Apr 12, 2025
10
0
1
Ohio
So I I just got my 94 mustang gt and I’m starting to work on when I can but the smog pump is locked up and I have a smaller belt to just completely bypass it but if I do would I still need to take the smog pump off and plug the holes and stuff or is ok to just bypass it and leave it?
 
If you take them off sooner rather than later then you will be able to hold on to them in the case you ever need them (they have become STUPID expensive).

In that case, you can just leave the entire thing the way it is until you're ready to completely remove it. You really don't need to cap or disconnect anything if you're going to take it all off anyway.

If it were me... I'd just replace the smog pump. O'Reiley's has them for around $130.

That is... until you're ready to do the entire exhaust.

The longer you run those cats with no smog pump running, the faster they will clog and kill performance.

Even when planning out your exhaust, I would include a 3-way cat. They do not require a smog pump at all.
 
If you take them off sooner rather than later then you will be able to hold on to them in the case you ever need them (they have become STUPID expensive).

In that case, you can just leave the entire thing the way it is until you're ready to completely remove it. You really don't need to cap or disconnect anything if you're going to take it all off anyway.

If it were me... I'd just replace the smog pump. O'Reiley's has them for around $130.

That is... until you're ready to do the entire exhaust.

The longer you run those cats with no smog pump running, the faster they will clog and kill performance.

Even when planning out your exhaust, I would include a 3-way cat. They do not require a smog pump at all.
Ok so essentially if I remove the cats I can put the smaller belt on bypass it and it would still be able to be drivin?
 
Ok so essentially if I remove the cats I can put the smaller belt on bypass it and it would still be able to be drivin?

Yes. I don't believe your 94 has O2 sensors before and after cats. Just before.

The air line that runs between the pump and the exhaust can be removed and/or capped.

You've probably already noticed the "Y" that the smog pump feeds.
 
If you take them off sooner rather than later then you will be able to hold on to them in the case you ever need them (they have become STUPID expensive).

In that case, you can just leave the entire thing the way it is until you're ready to completely remove it. You really don't need to cap or disconnect anything if you're going to take it all off anyway.

If it were me... I'd just replace the smog pump. O'Reiley's has them for around $130.

That is... until you're ready to do the entire exhaust.

The longer you run those cats with no smog pump running, the faster they will clog and kill performance.


Even when planning out your exhaust, I would include a 3-way cat. They do not require a smog pump at all.

My O'Reilly's free replacement pump has :poo: the bed today and they don't carry them anymore so ill get the original price I paid back in 2008 ($49.99) and now I need a shorter belt so I can keep daily driving her till I decide which delete pully to buy.
Anyone have the shorter belt size???