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Old 06-17-2010, 02:52 PM   #1
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High Idle

I just replaced my exhaust manifold on my 89 with 2.5L engine because it was cracked. In order to do this I had to remove my intake manifold and Throttle body. After putting everything back together I started the Jeep and am having a high idle (3000 RPMs). Any Idea what I could have do to cause this?

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Old 06-17-2010, 03:06 PM   #2
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vacuum leak?

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Old 06-17-2010, 03:10 PM   #3
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Yea my thoughts too. Are there any lines specifically to check that would cause this high idle?
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Old 06-17-2010, 03:26 PM   #4
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I don't know if his Jeep has one, but my old truck has a monster vacuum line to the master brake cylinder and it comes from the manifold - when it got cracked it caused a horribly high idle... and it's a big hose, too.....
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Old 06-17-2010, 03:52 PM   #5
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I looked around a found a nipple off the intake that didnt have a hose on it but couldn't find a lose hose any where. I took a picture of it. Does anyone know where the hose that hooks up to this nipple goes?
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Old 06-18-2010, 12:21 AM   #6
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Can some one with an early model YJ that has the 4cyl AMC 150 take a look and see what vacuum hose goes to that nipple?

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