embarrassing question

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Mar 1, 2015 | 06:21 PM

jlatr

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embarrassing question

I am new to fords. I have an early 2004 6.0 4x4. On the hubs it says auto and lock. When I engage the 4x4 in auto it seems to barely work. When I set the hubs to lock it works great. I watch Dieseltechron youtube videos on the vacuum system and followed his instructions. It does not appear I have any leaks. When you set the hubs to "lock" are they suppose to work better or is something wrong with my truck?

Mar 1, 2015 | 06:34 PM

Iaff113

Laughing Gas

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From: Frederick MD

Vacuum leak some place, what is the temperature in your area

Mar 1, 2015 | 06:36 PM

jlatr

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I live in CA in the central valley. So it never gets to cold here. Summer gets around 100+ winter low might be 32-45

Mar 1, 2015 | 06:42 PM

robs97z28

Mountain Pass

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From: Pheasant Hill, CA

Quote:

Originally Posted by jlatr

I live in CA in the central valley. So it never gets to cold here. Summer gets around 100+ winter low might be 32-45

Funny, I live near you.

you might also need to clean and oil the locking hub or the vacuum pump can be weak.

Mar 1, 2015 | 07:00 PM

jlatr

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How do you see if it is the selniod or the pump?

Mar 1, 2015 | 07:13 PM

robs97z28

Mountain Pass

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From: Pheasant Hill, CA

The pump and tank are mounted on the pass side fender. could plug vacuum gauge into one of the plastic line and get a reading. probably not the pump though. other things would not be working correctly. like the heater controls.

Mar 1, 2015 | 07:22 PM

jlatr

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When I switch to 4x4 my defrost comes on. So I am guessing a vaccum leak.

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Mar 1, 2015 | 07:50 PM

yak

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might be the esof solenoid on the fender buy the vacuum pump. you should have vsacuum all the time at one port and when In 4x4 it lets vacuum go to the hubs