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Unread 07-19-2008, 06:25 AM   #1
YJames90
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1990 YJ Wrangler 
 
Join Date: Jul 2007
Location: Dutchess County, NY
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4WD vac leak? engine related?

I was just reading an article on switching out YJ shafts for TJ shafts. It mentioned plugging the vac lines. When I installed the posi-lok I just cut the vac lines and did not pulg them. Is the 4wd vac unit seperate from the engine vac unit or does it all work off the engine? Should I plug theses lines for better enginr performance?

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Unread 07-19-2008, 06:35 AM   #2
NJeepyj91
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I have the posi lok and I plugged them. I just figured since they "suck" I didn't want anything getting in.
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Unread 07-19-2008, 10:23 AM   #3
crusty75
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Yes, plug them. You may have to re-tune your engine. Vac leaks will cause a lean condition...
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Unread 07-19-2008, 10:40 AM   #4
YJames90
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So the vac is created from the engine, that makes sense . Thanks
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