Question about 1992 Jeep Wrangler

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4 WHEEL DRIVE

When i am in 4 wheel high going down the road my 4 wheel light indicator light goes out when i press the gas pedal and when i let off it it comes back on.Ihave replaced the actuator on the the transfer case and on the shift motor.i believe it is a vacuum problem but have no idea how to find it.

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Yes you are dealing with a Vacuum leak, You develop much more manifold vacuum at idle or low throttle than you do at open throttle, Easiest way to find the leak is with a vacuum guage and a bunch of vacuum plugs, hook up the vacuum guage and disconnect and seal off the vacuum lines 1 by 1 untill you see the guage go up a signifigant amount. once you isolate the leaker you can hook the other ones up that you disconnected to make sure you haven't got more than 1, usually when the lines are deteriorated to the extent they crack and leak I spend the 50 bucks and replace em all.

Posted on Dec 07, 2008

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