Air injection system

[Munky]

Ok, I have a 1979 Jeep CJ5 and I bought a Hayne's manual for it. In the fuel section it talks about a air injection system. From what I have read in the book, there is the injection which is bolted to the engine (which I have), and there is one valve from there. The manual says that from that valve there is a tube about 2 inches long that connects to a diverter valve. From the diverter valve is another tube that connects to an electrically powered air pump (I do not have the diverter valve or the air pump). To make a long sorry short, I have searched countless websites and search numerous stores but to no avail. My question to everyone is, is there some way I can just cap the valve or somewhere I haven't look where I can buy the system?

 

[BusaDave9]

People often remove the air injection system and cap the tubes. They throw out the pump and everything else.
The point of the air injection system is by adding the air to the exhaust at the manifold it makes the cat work better.

There are 2 problems with removing the air injection system:
1. It increases emissions.
2. The cat can clog.

I also have a 1979 CJ5 . The PO has removed the air injection system and I never have tried to replace it.
I don't know where you could find those parts but I do know they are hard to find.

 

[IOPort51]

Air injection was about the first attempt of emissions control. It didn't work very well but it did what the US govt demanded it to do. Our brothers on the west coast have a real problem with this from what I have been told.
Do you have a tubing manifold bolted onto the exhaust manifold??
If you do remove what is left I would suggest you not throw the parts away, someday they may have great value.

 

[Munky]

Thank you both. But now I have another question. (Sorry for being such a noob.) What would be the best way to delete the air injection system or would a cap work?

 

[BusaDave9]

What would be the best way to delete the air injection system?

Follow these steps:
1. Petition and lobby to get the law changed so you can remove emission systems from cars.
2. Remove the air pump and all associated hoses.
3. Plug all holes that were created in step 2. Don't forget the holes in the exhaust manifold or the air tube in the cat.

 

[Munky]

Thank you for your quick response. Is there anything you would suggest instead of removing the system or is that the only thing I can do?

 

[BusaDave9]

You could look to find the OEM emissions parts. Your jeep will run cleaner.
The catalytic converters from the '80s and earlier were made with a honeycomb pattern of tinny holes. These cats can get clogged. This is more likely to happen if you remove the air injection system.

 

[Munky]

Thank you. Ok, I have one more question. Sorry if you're getting sick of me. This doesn't have to do with the air injection system, it has to do with the carb filter cover. I don't have one and I have three hoses (two that come from the carb and one from a metal tube towards the bottom of the block towards the front on the same side as the carb). Do these connect to the filter cover as sort of a breather or are the tubes something completely different? If you need photos so you know what I am talking about, I can take some.

 

[BusaDave9]

You may have to take some pictures but there should be an air line from the oil cap to the air filter housing. There should also be a vacuum line from the base of the carb to the PVC valve in the back of the engine. Hope this helps

 

[Munky]

I took some pictures and I followed the hose that was attached to the metal tube and it leads to the fuel filter.

In this photo, the top hose connecting to the double T connector is one of the hoses that seem to go no where.

This is the metal tube that connects to the fuel filter.

The hose closest to the outside is the one that is not connected.

The thicker hose that is coming from the bottom of the T connector and the slightly blue hose is the one stated on the other photo.

Another photo of that same hose.

 

[BusaDave9]

Yep, you'll need that. The Fuel filter has 3 lines attached to it. Fuel from the pump goes in one side of the filter and it come out 2 lines on the other side. The bigger fuel line goes to the carb. The smaller one goes back to the tank (it's the return line). This is because the pump pumps more than enough gas for most situations.

 

[Munky]

Alright, so what about the other two lines? Would they connect to the filter cover?

 

[BusaDave9]

These lines are for emissions control.
Earlier I posted the wrong image for your engine. I corrected my mistake and here again is the correct vacuum lines for the AMC 258 i6 / 4.2l

You can see those lines you are asking about go to the charcoal canister, the CTO and the ERG. If you mess with any vacuum lines you must make sure you don't end up with a leak in the vacuum system.

 

[Munky]

What do you suggest I do? I do not have a charcoal canister or a PCV valve and I am not sure what to do with those hoses.

 

[BusaDave9]

What do you suggest I do? I do not have a charcoal canister or a PCV valve and I am not sure what to do with those hoses.

Those hoses should be plugged.
I would recommend a PCV valve. It fits into a hole in the valve cover. It should also have a vacuum air line to the base of the carb. An OEM PCV valve will have one more vacuum connection than you'll need. You can plug it or you can get a PVC that only has one fitting on the top.

Also, what about your air filter? Can unfiltered air get into your carb? If so you shouldn't drive it until you can filter your air correctly.

 

[Munky]

Alright. Yes, it currently has no filter. I was planning on buying an aftermarket one, like a K&N filter or something of that nature that also acts as a cover.