SN95 Smog Pump in A Fox?

Mhalc1 · May 13, 2024

Greetings everyone, it is smog time for me and my smog pump seized up about a year ago... I have been just running a shorter belt and bypassed it but know i need one to pass smog. I read through this thread https://stangnet.com/mustang-forums/threads/how-to-install-fox-body-smog-pump-lots-of-pics.783109/ and saw dude used a fox pump in a sn95... both part numbers are still available but the foxbody went up from $79 15 years ago to over $300. The sn95 pump however i can do. Can anybody confirm this will work with my 1990 fox cardone 32-292 (https://shop.advanceautoparts.com/p/cardone-smog-air-pump-32-292/18980003-P?selectedStore=9891)

General karthief · May 13, 2024

My observation, you just have to deal with the discharge pipe, pull the pressed in pipe, replace with a core plug (freeze plug) and install bolt on discharge pipe pointed the same direction as it came off the fox pump.
Then, as they say, 'send it'.
Disclaimer: this is an observation and not based on any actual mechanical training.

Mustang5L5 · May 14, 2024

Pulley offset would be my concern. Even looking at the picture, that pump looks a lot shorter than the Fox pump.

Sn95 accessories are closer to the engine block than Fox.

Mcmahst · May 14, 2024

Just a question or two: you can’t find one in a salvage yard or via the salvage network? You would think these are easy to find, since most folks buy these cars and the first thing they do is strip these parts off. Why not post it in the parts wanted section here. And finally, as a CA neighbor, last time I had my truck in for its smog test, they didn’t open the hood. They plugged it in, saw no codes, and said I passed on that basis. Just my observation. Good luck.

Mustang5L5 · May 14, 2024

If he does have the original style cats on the car and needs to pass the sniffer, he will need the smog pump to inject oxygen into the cats to help with that process. He doesn't really clarify what "smog" entails for him however. My state doesn't pop the hood either, so all that stuff's been gone for years.

Youd think these pumps would be cheap. Many years ago I needed one and thought it would be easy to find one given that everyone tosses them out. Found some guy local who claimed he had a bucket of them in the shop because he "rips them off and throws them away". Showed up thinking i'd get a cheap pump and he wanted $100 for it.

Funny how all the throw-away parts suddenly become gold when they find someone who wants them.

limp · May 14, 2024

Mcmahst said:
Just a question or two: you can’t find one in a salvage yard or via the salvage network? You would think these are easy to find, since most folks buy these cars and the first thing they do is strip these parts off.

Not sure about you younger fellas with the 80-90 Foxbodies, but back in the late 60's-70's these effin smog pumps went straight into the trash can.......

Mustang5L5 · May 14, 2024

limp said:
Not sure about you younger fellas with the 80-90 Foxbodies, but back in the late 60's-70's these effin smog pumps went straight into the trash can.......

They did too...up until about 2010ish. Then some folks started hanging onto them.

Mhalc1 · May 14, 2024

Mcmahst said:
Just a question or two: you can’t find one in a salvage yard or via the salvage network? You would think these are easy to find, since most folks buy these cars and the first thing they do is strip these parts off. Why not post it in the parts wanted section here. And finally, as a CA neighbor, last time I had my truck in for its smog test, they didn’t open the hood. They plugged it in, saw no codes, and said I passed on that basis. Just my observation. Good luck.

Everytime i have smogged this car i have had to pass visual and the sniff test... i went once and the vacuum line to the smog pump was disconnected and it was a gross polluter... After realizing i reconnected it and went back and it passed... There are no Foxbody's in any junkyard near me and the only used one someone is selling is 2 hours away for $100 plus $20 shipping. i figured buying a new or remaned sn95 for that same price would make more sense.

evintho · May 14, 2024

Mcmahst said:
Just a question or two: you can’t find one in a salvage yard or via the salvage network? You would think these are easy to find, since most folks buy these cars and the first thing they do is strip these parts off. Why not post it in the parts wanted section here. And finally, as a CA neighbor, last time I had my truck in for its smog test, they didn’t open the hood. They plugged it in, saw no codes, and said I passed on that basis. Just my observation. Good luck.

I believe '99 and older they pop the hood and do a visual and sniffer test. 2000 and up, they just plug into the data port and don't do a visual or sniffer. Of course, just like the OP, I'm in one of the 'enhanced counties'. They do things different here (not better).

Mhalc1 · May 14, 2024

Mustang5L5 said:
Pulley offset would be my concern. Even looking at the picture, that pump looks a lot shorter than the Fox pump.

Sn95 accessories are closer to the engine block than Fox.

Is this true for the 5.0 sn95's? the part number says if fits the sn95 with the 5.0... I may just buy and try, learn and return.

Also my pulley is seized on mine it turns but gets hard at a certain point, maybe i can service mine... all i need is for it to pass smog and i can go straight back to a shorter belt to bypass it until next smog is needed.

evintho · May 14, 2024

Yeah, it's a pity. Just a month ago, I threw away the smog pump off my '93 thinking 'who would ever need this'. I had pulled the motor last year to transplant in my '54 and hung onto everything I didn't use. Last month I cleaned the garage and tossed a bunch of stuff. Dumb!
Could've delivered it too as I'm going to see my grandkids in Gilroy next week! Oh well.......spilled milk!

Mustang5L5 · May 14, 2024

Mhalc1 said:
Is this true for the 5.0 sn95's? the part number says if fits the sn95 with the 5.0... I may just buy and try, learn and return.

I have no idea what the smog pump differences are, but in general the accessory drive for the 91-93 thunderbird, 94-95 Mustang and 96+ explorer are a lot shorter in terms of distance to the engine.

Buy a pump with a return plan in mind. I don't think it will work but i'm not 100-% sure

Mhalc1 · May 14, 2024

evintho said:
Yeah, it's a pity. Just a month ago, I threw away the smog pump off my '93 thinking 'who would ever need this'. I had pulled the motor last year to transplant in my '54 and hung onto everything I didn't use. Last month I cleaned the garage and tossed a bunch of stuff. Dumb!
Could've delivered it too as I'm going to see my grandkids in Gilroy next week! Oh well.......spilled milk!

Damn... oh well. I should have asked a few weeks earlier.

Mhalc1 · May 14, 2024

Mustang5L5 said:
I have no idea what the smog pump differences are, but in general the accessory drive for the 91-93 thunderbird, 94-95 Mustang and 96+ explorer are a lot shorter in terms of distance to the engine.

Buy a pump with a return plan in mind. I don't think it will work but i'm not 100-% sure

Ok there is a local shop that carries the sn95 pump... i can check there return policy before i buy... if i cant get my hands on a foxbody pump in the next few weeks ill try it out, it seems like this could be a helpful experiment for us Californians.

Potomus Pete · May 14, 2024

I remember reading that the smog pump was not needed in California. Doesnt it only work when cold and most people go in with a hot motor

Mhalc1 · May 14, 2024

Potomus Pete said:
I remember reading that the smog pump was not needed in California. Doesnt it only work when cold and most people go in with a hot motor

I have tried a smog with a vacuum line on my smog pump accidently disconnected and one shortly after with it connected. the results were night and day. I believe it to be from the smog pump. I have explorer heads on my fox and i had to tap bolt holes to install the thermactor tube for visual, but i do not have any wholes like the e7 heads had. The reading below says those are engaged while the engine is warming up and at temp the smog pump helps the cats.

If anyone has legally passed CA sniff test without a smog pump let me know and ill give it another try.

"When the engine is cold, the thermactor air system pumps fresh air into the heads (there are bumps in each exhaust port in the head, air goes in from the back of the heads from the cross-over tube). When the engine is warmed up, the air is diverted to the cats which helps to create the catalytic reaction that converts hydrocarbons and carbon monoxide into C02 and water vapour." taken from (https://www.foxstang.com/fox-mustan...s,back of the heads from the cross-over tube).)

evintho · May 15, 2024

Potomus Pete said:
I remember reading that the smog pump was not needed in California. Doesnt it only work when cold and most people go in with a hot motor

Someone is giving you erroneous information. A smog pump is required, especially on a '79-'93 Mustang. That's why CA has a visual inspection too. When the smog tech pops the hood and notices a missing smog pump (glaring omission), that would be an epic FAIL!

Mustang5L5 · May 15, 2024

Mhalc1 said:
"When the engine is cold, the thermactor air system pumps fresh air into the heads (there are bumps in each exhaust port in the head, air goes in from the back of the heads from the cross-over tube). When the engine is warmed up, the air is diverted to the cats which helps to create the catalytic reaction that converts hydrocarbons and carbon monoxide into C02 and water vapour." taken from (https://www.foxstang.com/fox-mustang-smog-system-help/#:~:text=SMOG pump (Thermactor Air System) This pump brings,back of the heads from the cross-over tube).)

The oxygen is what helps the cats heat up and become more efficient. That's why there is a big difference in test data when running the original cats with and without the air pump.

The reason air pumps fell out of use is two-fold. Engines began to operate much more efficiently, and cat converters became more effective and material compositions changed. That's why someone with a well-tuned engine and modern style aftermarket cats might pass the sniffer test with flying colors, where someone else might not. Lots of variables.

Because of those variables, most states just default to stock equipment and a visual to ensure stock parts are present. Takes the variability out of the equation.

Mhalc1 · May 27, 2025

Sorry to bump this old thread but just in case someone comes across this thread i wanted to update... I was able to find a smog pump from someone on marketplace. It was not easy as i am on marketplace daily and it took about a year to finally find someone in my area selling a smog pump. I also has to buy the alternator idler pulley and the bracket as he didn't want to sell them apart. None the less i really do feel the sn95 5.0 pump would work, i also think a f150 5.0 pump would be able to work as well. the reason i didnt try the sn95 pump was becasue advanced auto was the only people who sold it and they closed there west coast shops down.

SN95 Smog Pump in A Fox?

Mhalc1

Member

General karthief

wonder how much it would cost to ship you a pair

Mustang5L5

That is…until I whipped out my Bissell

Mcmahst

Mustang5L5

That is…until I whipped out my Bissell

limp

wrap a little cheese around it and its a done

Mustang5L5

That is…until I whipped out my Bissell

Mhalc1

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evintho

Mhalc1

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evintho

Mustang5L5

That is…until I whipped out my Bissell

Mhalc1

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Mhalc1

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Potomus Pete

I'm still waiting for the fully nude shots

Mhalc1

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evintho

Mustang5L5

That is…until I whipped out my Bissell

Mhalc1

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SN95 Smog Pump in A Fox?

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That is…until I whipped out my Bissell

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