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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-

Smog pump bypass?

  • Thread starter Thread starter PvolkStang
  • Start date Start date Apr 12, 2025

PvolkStang

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#1
  • Apr 12, 2025
  • #1
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?
 

Noobz347

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#2
  • Apr 12, 2025
  • #2
Do you still have catalytic converters?
 

PvolkStang

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#3
  • Apr 12, 2025
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Noobz347 said:
Do you still have catalytic converters?
Click to expand...
Yes but I am planning on taking them off
 

Noobz347

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#4
  • Apr 12, 2025
  • #4
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.
 

PvolkStang

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Apr 12, 2025
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#5
  • Apr 12, 2025
  • #5
Noobz347 said:
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.
Click to expand...
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?
 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
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#6
  • Apr 12, 2025
  • #6
PvolkStang said:
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?
Click to expand...

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.
 

PvolkStang

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Apr 12, 2025
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#7
  • Apr 12, 2025
  • #7
Noobz347 said:
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.
Click to expand...
Yes and thank you
 

nickyb

I gotta say i never painted my nuts, Never Ever
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Apr 3, 2009
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Aug 26, 2025
#8
  • Aug 26, 2025
  • #8
Noobz347 said:
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.
Click to expand...

My O'Reilly's free replacement pump has 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???
 
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