Factory OEM emissions equipment for a 1977?

[billrod]

What if any emissions equipment came from the factory on a 1977 with a 302?

Thanks
Bill

 

[Rox Crusher]

all 77 came with PCV system and catalytic converter

most came with smog / air pump system

 

[Ovalis]

Along with the EGR system

 

[Broncobowsher]

The all have a full charcoal canister system as well.

 

[72_EB]

This will help with the underhood vacuum spaghetti.

 

[DirtDonk]

Lots of vacuum lines, timers, temperature-sensitive valves, one-way valves, etcetera...
Distributor may or may not have still come with the 2-port style vacuum advance/retard setup. Most later model ones did, but by '77 that might have changed.

Oh, and back then there could have been a big difference between a CA truck and a FED truck. Not seeing where you're located now, better find out where yours was sold originally too, just in case. That info is in the VIN number or glovebox plate info.

Paul

 

[Rox Crusher]

Oh, and back then there could have been a big difference between a CA truck and a FED truck. Not seeing where you're located now, better find out where yours was sold originally too, just in case. That info is in the VIN number or glovebox plate info.

Paul

Paul is right, which is why I said "most" came with a smog / air pump. This was determined by DSO, all CA deliveries and other DSO classified as "high altitude" or "Metropolatin" districts got the air pump. In rural areas they weren't required.

My DSO was nashville which meant it didn't have pump so I don't have to have one (under current CO law anyway).

 

[jspurl3]

This will help with the underhood vacuum spaghetti.

Do you happen to have the schematic for a 76???

 

[mitzel]

In addition to all the tidbits already mentioned,
in California they also check for:
- Non-vented / seal on fuel filler caps.
- Fuel filler neck restrictor.
- Idle speed and initial timing spot on based
on the emissions sticker info on valve cover.
- Stock air cleaner with thermostatic flapper
dealy to direct hot air from exhaust manifold
during cold startup.

 

[mitzel]

jspurl3
> Do you happen to have the schematic for a 76???

The closest thing I've ever found online is BroncOhio
diagrams for 1975:
http://www.broncohio.com/tech/national.jpg
http://www.broncohio.com/tech/califonia.jpg

I think those are sorta in the ballpark for 1976 also,
but the '76 EGR setup is definitely slightly different
plumbing.

 

[DirtDonk]

Along the lines of what mitzel said about the stock air cleaner, that means that it has to be intact too. No holes drilled into the housing for more air flow like a lot of people did back then, or an open element filter setup.
It all has to be sealed, and connected to the cold-air intake port that was standard on all '73 and later EB's, as well as the hot-air riser off the manifold or header tube.

Even the pre-73's, back when they still checked those, you couldn't have holes drilled or an open element, even though it still took hot air from under the hood.
They wanted to make sure your air was hot from the moment it started, to reduce whatever emissions were prevalent while warming up on the choke.

So, while you can probably get away with an aftermarket or non-Bronco air filter assembly, it has to be a sealed unit, pulling cooler air from the outside.

Paul