77 CJ5 258 Emissions/Vacuum Help - JeepForum.com
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post #1 of 43 Old 03-23-2020, 10:20 AM Thread Starter
beezler11
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77 CJ5 258 Emissions/Vacuum Help

I recently removed the manifold assembly to fix a leak on my 77 CJ5 with the 258 I6. I forgot to take pictures of where all the hoses were hooked up when I removed them and can’t seem to figure out where they need to go. I do know that no air pump is on the Jeep, but honestly don’t know what else the previous owner removed or done. Just looking for the bare minimum to get it up and running again. Thanks! Will post pics as soon as I can.

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post #2 of 43 Old 03-23-2020, 10:24 AM Thread Starter
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Here’s a couple to start. I’ll take more when I get a chance.
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post #3 of 43 Old 03-23-2020, 11:28 AM
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I've not had a CJ for 20 years, but I found my old manual languishing in my parents' garage some months back.

I doubt you have the feedback system and probably no air injection, but I'm including them anyway.

Josh
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post #4 of 43 Old 03-23-2020, 11:30 AM
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... more.
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post #5 of 43 Old 03-23-2020, 03:33 PM Thread Starter
beezler11
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Some more pics...I’m new to this stuff so the manuals are a little confusing. I believe I have the line to the distributor correct. But I have the 2 red flexible hoses and one short black hose to figure out where they go.
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post #6 of 43 Old 03-23-2020, 05:21 PM
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1. Find the big tube off your charcoal canister and take it to the big outlet on the carb bowl.

2. Take ported vacuum to both the charcoal canister and to the distributor.

Do those three first. I'll come back by when I have time to sit down again.

Josh
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post #7 of 43 Old 03-24-2020, 10:22 AM Thread Starter
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Quote:
Originally Posted by Wabatuckian View Post
1. Find the big tube off your charcoal canister and take it to the big outlet on the carb bowl.

2. Take ported vacuum to both the charcoal canister and to the distributor.

Do those three first. I'll come back by when I have time to sit down again.

Josh
This sounds stupid maybe but I’m not sure that I have a charcoal canister..
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post #8 of 43 Old 03-24-2020, 10:49 AM
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Quote:
Originally Posted by beezler11 View Post
This sounds stupid maybe but Iím not sure that I have a charcoal canister..
A.K.A. Fuel Vapor Storage Canister?
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post #9 of 43 Old 03-24-2020, 01:50 PM
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This sounds stupid maybe but Iím not sure that I have a charcoal canister..
It's a black canister, generally tucked in on the fenders.

Folks did tend to take 'em out.

Do you have anything like that?

Josh
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post #10 of 43 Old 03-26-2020, 06:03 PM Thread Starter
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Don’t believe I have the charcoal canister.
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post #11 of 43 Old 03-26-2020, 09:04 PM
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You can get a charcoal canister here:

https://store.delorean.com/p-6675-carbon-canister.aspx

As well as a roll-over check valve:

https://store.delorean.com/p-6703-ro...eck-valve.aspx

The charcoal canister on my '79 CJ5 is located directly under the windshield washer tank / reservoir.

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post #12 of 43 Old 03-27-2020, 06:13 AM
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If you don't have one any longer, and if emissions aren't a concern, just plug those two hoses off. You don't want to be leaking ported vacuum, or be venting gas fumes into the engine compartment.

Josh
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post #13 of 43 Old 03-27-2020, 03:15 PM Thread Starter
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Originally Posted by Hurricane4 View Post
You can get a charcoal canister here:

http://store.delorean.com/p-6675-carbon-canister.aspx

As well as a roll-over check valve:

http://store.delorean.com/p-6703-rol...eck-valve.aspx

The charcoal canister on my '79 CJ5 is located directly under the windshield washer tank / reservoir.
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Originally Posted by Wabatuckian View Post
If you don't have one any longer, and if emissions aren't a concern, just plug those two hoses off. You don't want to be leaking ported vacuum, or be venting gas fumes into the engine compartment.

Josh
I’ll find where those ones route and cap them off somehow. Maybe that’s why it’s had a pretty strong gas smell. Bottom line is that I’m trying to figure out what absolutely needs connected with my current setup which so far I’ve determined is no air pump and no charcoal canister.
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post #14 of 43 Old 03-28-2020, 08:21 AM
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Iíll find where those ones route and cap them off somehow.
Vacuum caps:



Click for the Autozone page.


Quote:
Maybe thatís why itís had a pretty strong gas smell.
Very likely a contributor.

Quote:
Bottom line is that Iím trying to figure out what absolutely needs connected with my current setup which so far Iíve determined is no air pump and no charcoal canister.
That's fine. The trick is to do it with no vacuum leaks. The timed spark advance is essential, and likely has another hose spliced off it going to something else.

Also, keep the EGR. It cools the valves and lowers combustion temp.

You're not in Northern Indiana, are ya'?

Josh
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post #15 of 43 Old 03-28-2020, 01:22 PM Thread Starter
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Quote:
Originally Posted by Wabatuckian View Post
Quote:
Originally Posted by beezler11 View Post
I’ll find where those ones route and cap them off somehow.
Vacuum caps:



Click for the Autozone page.


Quote:
Maybe that’s why it’s had a pretty strong gas smell.
Very likely a contributor.

Quote:
Bottom line is that I’m trying to figure out what absolutely needs connected with my current setup which so far I’ve determined is no air pump and no charcoal canister.
That's fine. The trick is to do it with no vacuum leaks. The timed spark advance is essential, and likely has another hose spliced off it going to something else.

Also, keep the EGR. It cools the valves and lowers combustion temp.

You're not in Northern Indiana, are ya'?

Josh
Nope, North Carolina here. The hardest part is not knowing what I do and don’t need or have. I don’t believe I have an EGR from looking at pics of what an EGR looks like. Maybe it used to go here...
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