4x4 will not engage - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 02-28-2013, 01:37 PM Thread Starter
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4x4 will not engage

Hey guys, my 4x4 wont engage unless I lock the hubs, then it works fine. Why is this?

E99 7.3 6 speed, 5 inch exhaust
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post #2 of 3 Old 02-28-2013, 06:30 PM
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Possible moisture in your vacuum lines, or if it's cold enough, iced up. I had this issue once.


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post #3 of 3 Old 03-01-2013, 06:43 AM
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I believe he is in Missouri. Do a check of your vacuum hoses and follow it up to the collector. It usually would crack near the axle hubs. If you don't find it visually, do a vacuum check of your hubs and of the system.


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