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Unread 07-14-2013, 10:59 PM   #1
Dwarf
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1987 YJ Wrangler 
 
Join Date: May 2013
Location: Katy, Texas
Posts: 159
Need vacuum help - not standard stuff

Hey gang,

I've been reading on several threads, so please don't blast me until you've seen my setup. I have a yj that the po put a 76-78 258 into. My main concern is that the engine stumbles after it gets up to temp. It starts great and idles fine, but stumbles a bit while running down the road.

I'm trying to make sense of my setup against these awesome diagrams (thanks for making these)
http://s58.photobucket.com/user/Bird...Mod-1.jpg.html
And http://home.sprynet.com/~dale02/list.htm

Here are some pictures of my setup. No computer, no stepper, no o2 sensor:
https://picasaweb.google.com/Pullen....98207762138066

Are these older versions of what became the cto?
https://picasaweb.google.com/Pullen....98084816514130
https://picasaweb.google.com/Pullen....98140862366178

Egr has nothing hooked up to it
https://picasaweb.google.com/Pullen....98276292136850

Snorkle has no vacuum valves
https://picasaweb.google.com/Pullen....98334567111218


Hanks for any pointers,
D

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Unread 07-14-2013, 11:21 PM   #2
Dwarf
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1987 YJ Wrangler 
 
Join Date: May 2013
Location: Katy, Texas
Posts: 159
I found this thread and will be re-hosing tomorrow.
http://www.jeepforum.com/forum/f8/po...vance-1517892/
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Unread 07-15-2013, 04:02 AM   #3
John Strenk
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1976 CJ5 
 
Join Date: Feb 2005
Location: Shalersville Ohio
Posts: 12,967
Yeah, but those won't help you veru much with a steel manifold that has no water jacket.

These might help more.












Now you may not have all those CTO's. On my 76 I just ran the vacuum advance to the spark port. I skipped the cto to switch from manifold to poerted vacuum.

Do you know how to check your timing?


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Unread 07-15-2013, 09:36 AM   #4
Dwarf
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1987 YJ Wrangler 
 
Join Date: May 2013
Location: Katy, Texas
Posts: 159
Thanks a ton John. I haven't setup the timing in this one yet. I have done timing on older GMs, where I put the light on the #1 plug and used the strobe to make sure it was firing when the crank it at TDC. I assume it's a similar process on the 258. Is that right?
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