Desmogging CA truck
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
T/E (Thermactor Emission - smog pump) originally installed in 1966 F100/Bronco/Econoline & Passenger Cars, long before catalytic converters were introduced!
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Joined: Jan 2001
Posts: 57,014
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From: Virginia
And I have heard something else; The cat doesn't work right unless it's hot enough, so on the old carbed systems they ran the engine a little richer during warm-up to help the cat warm up quicker so it would start working sooner.
GM always had a nice little paragraph at the beginning of each chapter that explained the theory of operation. Ford does sometimes.
GM always had a nice little paragraph at the beginning of each chapter that explained the theory of operation. Ford does sometimes.
Posting Guru
Joined: Apr 2011
Posts: 1,636
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From: Orlando area
I read a Wiki article about these "Cats" that says the fuel-ratio on a cat equipped engine needs to swing back and forth between rich and lean (the feedback carb) so that cat can do its work and "recharge".
When the exhaust is rich the cat burns the excess fuel and does its thing - then the exhaust needs to go lean so the O2 stored on/in the cat can replenish. When the engine is cold and the mixture is rich, the cat can't recharge - that is why the air pump was added.
When the exhaust is rich the cat burns the excess fuel and does its thing - then the exhaust needs to go lean so the O2 stored on/in the cat can replenish. When the engine is cold and the mixture is rich, the cat can't recharge - that is why the air pump was added.
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Mountain Pass
Joined: Sep 2016
Posts: 137
Likes: 9
From: Southwest Ohio
This truck is a 1983 250 HD and GVWR is 8600. I yanked the. Motor today and dropped it off at my engine builder. I will also put the original carb in the emissions box as I do not think I will be using it.
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From: Angier, NC
Dave ----
Post Fiend
Joined: Apr 2002
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From: Waterloo, Iowa
It's my understanding Thermactor would result in burning of the excess hydrocarbons, not really dilution as such. The platinum catalysts later on removed NOX emissions too, that contribute to smog. A lot of people would remove the "air pump".
Cargo Master
Joined: Aug 2007
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From: New Zealand
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Joined: Jan 2001
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From: Virginia
If it's a play toy you can go more radical on everything.
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Joined: Jul 2015
Posts: 2,239
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From: Northeast Ohio USA
As far as resale value is concerned, here in Ohio, most do not want all of the emissions if they can avoid it. It is a good idea to package up everything you remove for originality reasons. Ohio only tests (as of current) 1990 and newer vehicles and only in select counties. And I've yet to hear a Trooper, Deputy, or Officer say :
"Can I see your license, registration, proof of insurance, and oh...BTW.......
Does your vehicle have it's original emissions equipment installed ? "
Motor Carrier Enforcement won't even look at it unless it's a straight truck
or tractor-trailer.
Just doesn't happen in this neck of the country. They have bigger fish to fry, like rolling meth labs and heroin.
"Can I see your license, registration, proof of insurance, and oh...BTW.......
Does your vehicle have it's original emissions equipment installed ? "
Motor Carrier Enforcement won't even look at it unless it's a straight truck
or tractor-trailer.
Just doesn't happen in this neck of the country. They have bigger fish to fry, like rolling meth labs and heroin.
Thread Starter
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Mountain Pass
Joined: Sep 2016
Posts: 137
Likes: 9
From: Southwest Ohio
As far as resale value is concerned, here in Ohio, most do not want all of the emissions if they can avoid it. It is a good idea to package up everything you remove for originality reasons. Ohio only tests (as of current) 1990 and newer vehicles and only in select counties. And I've yet to hear a Trooper, Deputy, or Officer say :
"Can I see your license, registration, proof of insurance, and oh...BTW.......
Does your vehicle have it's original emissions equipment installed ? "
Motor Carrier Enforcement won't even look at it unless it's a straight truck
or tractor-trailer.
Just doesn't happen in this neck of the country. They have bigger fish to fry, like rolling meth labs and heroin.
"Can I see your license, registration, proof of insurance, and oh...BTW.......
Does your vehicle have it's original emissions equipment installed ? "
Motor Carrier Enforcement won't even look at it unless it's a straight truck
or tractor-trailer.
Just doesn't happen in this neck of the country. They have bigger fish to fry, like rolling meth labs and heroin.
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
Right, but meth heads and drug dealers are oftentimes dangerous, armed, and crazy if not necessarily in that order.
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Mountain Pass
Joined: Sep 2016
Posts: 137
Likes: 9
From: Southwest Ohio
My experience mirrors your comment.
Posting Guru
Joined: Jul 2015
Posts: 2,239
Likes: 5
From: Northeast Ohio USA
As does mine, on a continual daily basis. I should have listened to Mom and been a garbage collector. Finish the route by 1 pm and be home by 3 pm. Instead, these hop-heads keep me going until well after 7 pm.