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Unread 08-10-2011, 01:08 PM   #1
beachedjeepyj
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1988 YJ Wrangler 
 
Join Date: Jul 2009
Location: corpus christi texas
Posts: 581
4x4 vacuum line problems



Ok i followed the diagram but i still have problems... Having the "correct setup" the axle stays locked all the time and the 4x4 light stays off. But when i switch the yellow and green lines on the CAD the axle stays unlocked all the time and the 4x4 light stays on.

It seems i have a constant vacuum from the yellow line all the time and none from the green line. It seems i need some help figuring out what is wrong.

Also on the diagram there is black and white figure on the yellow line that goes between the CAD and the T to the black line and indicator switch. What is this?

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[QUOTE=Jeep89JV;9284099]Do I let others drive my rig? No -- Why, because if this ship sinks i'll be the captain and I go down with this ship.[/QUOTE]



[url]http://www.jeepforum.com/forum/f12/motorcraft-carb-swap-961766/[/url]
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Unread 08-10-2011, 01:39 PM   #2
dancytron
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1990 YJ Wrangler 
 
Join Date: Jun 2008
Location: st. louis
Posts: 1,372


This is a better diagram of 1990 and before. For after 1990, your diagram is wrong. Sounds like the green line is bad or the switch on the transfer case is bad.

The "black and white figure" is a check valve.
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Unread 08-10-2011, 02:14 PM   #3
c0rnd0g
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Location: Central, IA
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Are the vacuum check valves just a standard item found in parts stores? I'm going to have to rebuild my vacuum system.
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Unread 08-11-2011, 12:52 PM   #4
beachedjeepyj
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1988 YJ Wrangler 
 
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Location: corpus christi texas
Posts: 581
Ok found out that the switch on the t-case was bad. Replaced it now it works but the 4x4 indicator light is not turning on... the indicator is not bad though, I hooked direct vacuum to it and it turned on.
__________________
[QUOTE=Jeep89JV;9284099]Do I let others drive my rig? No -- Why, because if this ship sinks i'll be the captain and I go down with this ship.[/QUOTE]



[url]http://www.jeepforum.com/forum/f12/motorcraft-carb-swap-961766/[/url]
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Unread 08-11-2011, 08:47 PM   #5
dancytron
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1990 YJ Wrangler 
 
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Location: st. louis
Posts: 1,372
Probably a bad line. The lines are more than 20 years old. You probably should replace them all if you want it to be dependable.
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